N-acetyl aldosamines and related N-acetyl compounds, and their topical use

Abstract

Compositions comprising N-acetyl-aldosamines, N-acetylamino acids, and related N-acetyl compounds are useful to alleviate or improve various cosmetic conditions and dermatological disorders, including changes or damage to skin, nail and hair associated with intrinsic aging and/or extrinsic aging, as well as changes or damage caused by extrinsic factors. N-acetyl-aldosamines, N-acetylamino acids, and related N-acetyl composition may further comprise a cosmetic, pharmaceutical or other topical agent to enhance or create synergetic effects.

1. A composition comprising (A) a pharmaceutically acceptable vehicle for topical treatment of cosmetic conditions or dermatological disorders and (B) a therapeutically effective amount of at least one compound selected from the group consisting of N-acetyl aldosamines and N-acetylamino acids,
 wherein the N-acetyl aldosamine is selected from the group consisting of N-acetyl-glycerosamine, N-acetyl-erythrosamine, N-acetyl-threosamine, N-acetyl-ribosamine, N-acetyl-arabinosamine, N-acetyl-xylosamine, N-acetyl-lyxosamine, N-acetyl-allosamine, N-acetyl-altrosamine, N-acetyl-gulosamine, N-acetyl-idosamine, N-acetyl-talosamine, N-acetyl-glucoheptosamine, N-acetyl-galactoheptosamine, N-acetyl-mannaheptosamine, N-acetyllactosamine, N-acetylmuramic acid, N-acetylneuramine, N-acetylneuramin lactose, N-acetyl-glyceraminic acid, N-acetyl-erythrosaminic acid, N-acetyl-threosaminic acid, N-acetyl-ribosaminic acid, N-acetyl-arbinosaminic acid, N-acetyl-xylosaminic acid, N-acetyl-lyxosaminic acid, N-acetyl-allosaminic acid, N-acetyl-altrosaminic acid, N-acetyl-glucosaminic acid, N-acetyl-mannosaminic acid, N-acetyl-gulosaminic acid, N-acetyl-idosaminic acid, N-acetyl-galactosaminic acid, N-acetyl-talosaminic acid, N-acetyl-hepotoglucosaminic acid, N-acetyl-heptogalactosaminic acid, N-acetyl-heptomannosaminic acid, N-acetyl-neuraminic acid, and isomeric or nonisomeric, free acid, salt, lactone, amide, and ester forms thereof; and    wherein the N-acetylamino acid is selected from the group consisting of N-acetyl-phenylalanine, N-acetyl-arginine, N-acetyl-lysine, N-acetyl-tryptophan, N-acetyl-glycine, N-acetyl-alanine, N-acetyl-valine, N-acetyl-leucine, N-acetyl-isoleucine, N-acetyl-threonine, N-acetyl-aspartic acid, N-acetyl-proline, N-acetyl-asparagine, N-acetyl-histidine, N-acetyl-β-alanine, N-acetyl-taurine, N-acetyl-r-aminobutanoic acid, N-acetyl-hydroxyproline, N-acetyl-canavanine, N-acetyl-hydroxylysine, N-acetyl-cycloserine, N-acetyl-homoarginine, N-acetyl-norleucine, N-acetyl-norvaline, N-acetyl-homoserine, N-acetyl-methylserine, N-acetyl-hydroxyvaline, N-acetyl-ethionine, N-acetyl-methoxinine, N-acetyl-β-aminoisobutanoic acid, N-acetyl-homocysteine, N-acetyl-cysteine sulfinic acid, N-acetyl-homophenylalanine, N-acetyl-homotryptophan, N-acetyl-5-hydroxytroptamine (N-acetylserotonin), N-acetyltryptamine, N-acetyl-ornithine, N-acetyl-citrulline, N-acetyl-argininocuccinic acid, N-acetyl-dopa, N-acetyl-3-idotyrosine N-acetyl-3,5-diiodotyrosine, N-acetyl-3,5,3′-triiodothyronine, N-acetyl-thyroxine, N-acetyl-creatine, N-acetyl-creatinine, N-acetyl-cystine, N-acetyl-homocystine, isomeric or nonisomeric, free acid, salt, lactone, amide, and ester forms thereof, and N-acetyl-glutamic acid and isomeric or nonisomeric, free acid, lactone, amide, and ester forms thereof.    
     
     
       2. The composition of  claim 1 , wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of disturbed keratinization, defective syntheses of dermal components, and changes associated with aging of skin, nail, and hair, conditions and disorders which include dryness of or looseness of skin, nail, and hair, xerosis, ichthyosis, palmar hyperkeratoses, plantar hyperkeratoses, uneven and rough surfaces of skin, nail, and hair, dandruff, Darier's disease, lichen simplex chronicus, keratoses, acne, pseudofolliculitis barbae, eczema, psoriasis, pruritus, warts, herpes, age spots, lentigines, melasmas, blemished skin, hyperkeratoses, hyperpigmented skin, abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin as well as diminished levels of such components in the dermis, stretch marks, skin lines, fine lines, wrinkles, thinning of skin, nail plate, and hair, skin thickening due to elastosis of photoaging, loss or reduction of skin, nail and hair resiliency, elasticity and recoilability, lack of skin, nail and hair lubricants and luster, dull and older-looking skin, nails and hair, and fragility and splitting of nails and hair. 
     
     
       3. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising (A) a pharmaceutically acceptable vehicle for topical treatment of cosmetic conditions or dermatological disorders and (B) a therapeutically effective amount of composition comprising at least one compound selected from the group consisting of N-acetyl-aldosamines and N-acetylamino acids,
 wherein the N-acetyl aldosamine is selected from the group consisting of N-acetyl-glycerosamine, N-acetyl-erythrosamine, N-acetyl-threosamine, N-acetyl-ribosamine, N-acetyl-arabinosamine, N-acetyl-xylosamine, N-acetyl-lyxosamine, N-acetyl-allosamine, N-acetyl-altrosamine, N-acetyl-mannosamine, N-acetyl-gulosamine, N-acetyl-idosamine, N-acetyl-talosamine, N-acetyl-glucoheptosamine, N-acetyl-galactoheptosamine, N-acetyl-mannaheptosamine, N-acetyllactosamine, N-acetylmuramic acid, N-acetylneuramine, N-acetylneuramin lactose, N-acetyl-glyceraminic acid, N-acetyl-erythrosaminic acid, N-acetyl-threosaminic acid, N-acetyl-ribosaminic acid, N-acetyl-arbinosaminic acid, N-acetyl-xylosaminic acid, N-acetyl-lyxosaminic acid, N-acetyl-allosaminic acid, N-acetyl-altrosaminic acid, N-acetyl-glucosaminic acid, N-acetyl-mannosaminic acid, N-acetyl-gulosaminic acid, N-acetyl-idosaminic acid, N-acetyl galactosaminic acid, N-acetyl-talosaminic acid, N-acetyl-heptoglucosaminic acid, N-acetyl-heptogalactosaminic acid, N-acetyl-heptomannosaminic acid, N-acetyl-neuraminic acid, and isomeric or nonisomeric, free acid, salt, lactone, amide, and ester forms thereof; and    wherein the N-acetylamino acid is selected from the group consisting of N-acetyl-phenylalanine, N-acetyl-arginine, N-acetyl-lysine, N-acetyl-tryptophan, N-acetyl-glycine, N-acetyl-alanine, N-acetyl-valine, N-acetyl-leucine, N-acetyl-isoleucine, N-acetyl-threonine, N-acetyl-aspartic acid, N-acetyl-proline, N-acetyl-asparagine, N-acetyl-arginine, N-acetyl-lysine, N-acetyl-histidine, N-acetyl-phenylalanine, N-acetyl-tryptophan, N-acetyl-proline, N-acetyl-β-alanine, N-acetyl-taurine, N-acetyl-r-aminobutanoic acid, N-acetyl-hydroxyproline, N-acetyl-canavanine, N-acetyl-hydroxylysine, N-acetyl-cycloserine, N-acetyl-homoarginine, N-acetyl-norleucine, N-acetyl-norvaline, N-acetyl-homoserine, N-acetyl-methylserine, N-acetyl-hydroxyvaline, N-acetyl-ethionine, N-acetyl-methoxinine, N-acetyl-β-aminoisobutanoic acid, N-acetyl-homocysteine, N-acetyl-cysteine sulfinic acid, N-acetyl-homophenylalanine, N-acetyl-homotryptophan, N-acetyl-5-hydroxytryptamine (N-acetylserotonin), N-acetyltryptamine, N-acetyl-ornithine, N-acetyl-citrulline, N-acetyl-argininosuccinic acid, N-acetyl-dopa, N-acetyl-3-iodotyrosine, N-acetyl-3,5-diiodotyrosine, N-acetyl-3,5,3′-triiodothyronine, N-acetyl-thyroxine, N-acetyl-creatine, N-acetyl-creatinine, N-acetyl-cystine, N-acetyl-homocystine, isomeric or nonisomeric, free acid, salt, lactone, amide, and ester forms thereof, and N-acetyl glutamic acid and isomeric or nonisomeric, free acid, lactone, amide, and ester forms thereof.    
     
     
       4. The method of  claim 3 , wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of disturbed keratinization, defective syntheses of dermal components, and changes associated with aging of skin, nail and hair, conditions and disorders which include dryness or looseness of skin, nail, and hair, xerosis, ichthyosis, palmar hyperkeratoses, plantar hyperkeratoses, uneven and rough surfaces of skin, nail, and hair, dandruff, Darier's disease, lichen simplex chronicus, keratoses, acne, pseudofolliculitis barbae, eczema, psoriasis, pruritus, warts, herpes, age spots, lentigines, melasmas, blemished skin, hyperkeratoses, hyperpigmented skin, abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin as well as diminished levels of such components in the dermis, stretch marks, skin lines, fine lines, wrinkles, thinning of skin, nail plate, and hair, skin thickening due to elastosis of photoaging, loss or reduction of skin, nail, and hair resiliency, elasticity and recoilability, lack of skin, nail, and hair lubricants and luster, dull and older-looking skin, nails, and hair, and fragility and splitting of nails and hair. 
     
     
       5. A composition comprising:
 (A) a pharmaceutically acceptable vehicle for topical treatment of cosmetic conditions or dermatological disorders,    (B) a therapeutically effective amount of at least one compound selected from the group consisting of N-acetyl aldosamines, and N-acetylamino acids,    wherein the N-acetyl aldosamine is selected from the group consisting of N-acetyl-glycerosamine, N-acetyl-erythrosamine, N-acetyl-threosamine, N-acetyl-ribosamine, N-acetyl-arabinosamine, N-acetyl-xylosamine, N-acetyl-lyxosamine, N-acetyl-allosamine, N-acetyl-altrosamine, N-acetyl-gulosamine, N-acetyl-idosamine, N-acetyl-talosamine, N-acetyl-glucoheptosamine, N-acetyl-galactoheptosamine, N-acetyl-mannoheptosamine, N-acetyllactosamine, N-acetylmuramic acid, N-acetylneuramine, N-acetylneuramin lactose, N-glyceraminic acid, N-acetyl-erythrosaminic acid, N-acetyl-threosaminic acid, N-acetyl-ribosaminic acid, N-acetyl-arbinosaminic acid, N-acetyl-xylosaminic acid, N-acetyl-lyxosaminic acid, N-acetyl-allosaminic acid, N-acetyl-altrosaminic acid, N-acetyl-glucosaminic acid, N-acetyl-mannosaminic acid, N-acetyl-gulosaminic acid, N-acetyl-idosaminic acid, N-acetyl-galactosaminic acid, N-acetyl-talosaminic acid, N-acetyl-heptoglucosaminic acid, N-acetyl-heptogalactosaminic acid, N-acetyl-heptomannosaminic acid, and N-acetyl-neuraminic acid, and isomeric or nonisomeric, free acid, salt, lactone, amide, and ester forms thereof; and    wherein the N-acetylamino acid is selected from the group consisting of N-acetyl-phenylalanine, N-acetyl-arginine, N-acetyl-lysine, N-acetyl-tryptophan, N-acetyl-glycine, N-acetyl-alanine, N-acetyl-valine, N-acetyl-leucine, N-acetyl-isoleucine, N-acetyl-threonine, N-acetyl-aspartic acid, N-acetyl-asparagine, N-acetyl-histidine, N-acetyl-proline, N-acetyl-β-alanine, N-acetyl-taurine, N-acetyl-r-aminobutanoic acid, N-acetyl-hydroxyproline, N-acetyl-canavanine, N-acetyl-hydroxylysine, N-acetyl-cycloserine, N-acetyl-homoarginine, N-acetyl-norleucine, N-acetyl-norvaline, N-acetyl-homoserine, N-acetyl-methylserine, N-acetyl-hydroxyvaline, N-acetyl-ethionine, N-acetyl-methoxinine, N-acetyl-β-aminoisobutanoic acid, N-acetyl-homocysteine, N-acetyl-cysteine sulfinic acid, N-acetyl-homophenylalanine, N-acetyl-homotryptophan, N-acetyl-5-hydroxytryptamine (N-acetylserotonin), N-acetyltryptamine, N-acetyl-ornithine, N-acetyl-citrulline, N-acetyl-argininosuccinic acid, N-acetyl-dopa, N-acetyl-3-iodotyrosine, N-acetyl-3,5-diiodotyrosine, N-acetyl-3,5,3′-triiodothyronine, N-acetyl-thyroxine, N-acetyl-creatine, N-acetyl-creatinine, N-acetyl-cystine, N-acetyl-homocystine, and or isomeric or nonisomeric, free acid, salt, lactone, amide, or ester forms thereof, and N-acetyl-glutamic acid and isomeric or nonisomeric, free acid, lactone, amide, or ester forms thereof; and    (C) a cosmetic, pharmaceutical, or other topical agent.    
     
     
       6. The composition of  claim 5 , wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of disturbed keratinization, defective syntheses of dermal components, and changes associated with aging of skin, nail and hair, conditions and disorders which include dryness of or looseness of skin, nail, and hair, xerosis, ichthyosis, palmar hyperkeratoses, plantar hyperkeratoses, uneven and rough surfaces of skin, nail, and hair, dandruff, Darier's disease, lichen simplex chronicus, keratoses, acne, pseudofolliculitis barbae, eczema, psoriasis, pruritus, warts, herpes, age spots, lentigines, melasmas, blemished skin, hyperkeratoses, hyperpigmented skin, abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin as well as diminished levels of such components in the dermis, stretch marks, skin lines, fine lines, wrinkles, thinning of skin, nail plate, and hair, skin thickening due to elastosis of photoaging, loss or reduction of skin, nail, and hair resiliency, elasticity and recoilability, lack of skin, nail, and hair lubricants and luster, dull and older-looking skin, nails and hair, and fragility and splitting of nails and hair. 
     
     
       7. The composition of  claim 5 , wherein the cosmetic, pharmaceutical, or other topical agent is selected from the group consisting of agents that improve or eradicate age spots, keratoses and wrinkles, local analgesics and anesthetics, antiacne agents, antibacterials, antiyeast agents, antifingal agents, antiviral agents, antidandruff agents, antidermatitis agents, antihistamine agents, antipruritic agents, antiemetics, antimotion sickness agents, antiinflammatory agents, antihyperkeratotic agents, antiperspirants, antipsoriatic agents, antiseborrheic agents, hair conditioner and hair treatment agents, antiaging and antiwrinkle agents, sunblock and sunscreen agents, skin lightening agents, depigmenting agents, vitamins, corticosteroids, tanning agents, hormones, retinoids, and topical cardiovascular agents. 
     
     
       8. The composition of  claim 5 , wherein the cosmetic, pharmaceutical or other topical agent is selected from the group consisting of clotrimazole, ketoconazole, miconazole, griseofulvin, econazole, metronidazole, hydroxyzine, diphenhydramine, pramoxine, lidocaine, procaine, mepivacaine, monobenzone, erythromycin, tetracycline, clindamycin, meclocycline, hydroquinone, hydroquinone monoether, minocycline, naproxen, ibuprofen, theophylline, cromolyn, albuterol, retinol, retinyl acetate, retinyl palmitate, retinoic acid, 13-cis retinoic acid, hydrocortisone, hydrocortisone 21-acetate, hydrocortisone 17-valerate, hydrocortisone 17-butyrate, betamethasone valerate, betamethasone dipropionate, triamcinolone acetonide, fluocinonide, clobetasol propionate, benzoyl peroxide, crotamiton, propranolol, promethazine, salicylic acid, vitamin E, and vitamin E acetate. 
     
     
       9. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising:
 (A) a pharmaceutically acceptable vehicle for topical treatment of cosmetic conditions or dermatological disorders,    (B) a therapeutically effective amount of at least one compound selected from the group consisting of N-acetyl aldosamines and N-acetylamino acids,    wherein the N-acetyl aldosamine is selected from the group consisting of N-acetyl-glycerosamine, N-acetyl-erythrosamine, N-acetyl-threosamine, N-acetyl-ribosamine, N-acetyl-arabinosamine, N-acetyl-xylosamine, N-acetyl-lyxosamine, N-acetyl-allosamine, N-acetyl-altrosamine, N-acetyl-mannosamine, N-acetyl-gulosamine, N-acetyl-idosamine, N-acetyl-talosamine, N-acetyl-glucoheptosamine, N-acetyl-galactoheptosamine, N-acetyl-mannoheptosamine, N-acetyllactosamine, N-acetylmuramic acid, N-acetylneuramine, N-acetylneuramin lactose, N-acetyl-glyceraminic acid, N-acetyl-erythrosaminic acid, N-acetyl-threosaminic acid, N-acetyl-ribosaminic acid, N-acetyl-arbinosaminic acid, N-acetyl-xylosaminic acid, N-acetyl-lyxosaminic acid, N-acetyl-allosaminic acid, N-acetyl-altrosaminic acid, N-acetyl-glucosaminic acid, N-acetyl-mannosaminic acid, N-acetyl-gulosaminic acid, N-acetyl-idosaminic acid, N-acetyl-galactosaminic acid, N-acetyl-talosaminic acid, N-acetyl-heptoglucosaminic acid, N-acetyl-heptogalactosaminic acid, N-acetyl-heptomannosaminic acid, and N-acetyl-neuraminic acid, and isomeric or nonisomeric, free acid, salt, lactone, amine and ester forms thereof; and    wherein the N-acetylamino acid is selected from the group consisting of N-acetyl-phenylalanine, N-acetyl-arginine, N-acetyl-lysine, N-acetyl-tryptophan, N-acetyl-glycine, N-acetyl-alanine, N-acetyl-valine, N-acetyl-leucine, N-acetyl-isoleucine, N-acetyl-threonine, N-acetyl-aspartic acid, N-acetyl-asparagine, N-acetyl-arginine, N-acetyl-lysine, N-acetyl-histidine, N-acetyl-phenylalanine, N-acetyl-tryptophan, N-acetyl-proline, N-acetyl-β-alanine, N-acetyl-taurine, N-acetyl-r-aminobutanoic acid, N-acetyl-hydroxyproline, N-acetyl-canavanine, N-acetyl-hydroxylysine, N-acetyl-cycloserine, N-acetyl-homoarginine, N-acetyl-norleucine, N-acetyl-norvaline, N-acetyl-homoserine, N-acetyl-methylserine, N-acetyl-hydroxyvaline, N-acetyl-ethionine, N-acetyl-methoxinine, N-acetyl-β-aminoisobutanoic acid, N-acetyl-homocysteine, N-acetyl-cysteine sulfinic acid, N-acetyl-homophenylalanine, N-acetyl-homotryptophan, N-acetyl-5-hydroxytroptamine (N-acetylserotonin), N-acetyltryptamine, N-acetyl-ornithine, N-acetyl-citrulline, N-acetyl-argininocuccinic acid, N-acetyl-dopa, N-acetyl-3-idotyrosine, N-acetyl-3,5-diiodotyrosine, N-acetyl 3,5,3′-triiodothyronine, N-acetyl-thyroxine, N-acetyl-creatine, N-acetyl-creatinine, N-acetyl-cystine, N-acetyl-homocystine, and isomeric or nonisomeric, free acid, salt, lactone, amide, or ester forms thereof, and N-acetyl-glutamic acid and isomeric or nonisomeric, free acid, lactone, amide, or ester forms thereof; and    (C) a cosmetic, pharmaceutical, or other topical agent.    
     
     
       10. The method of  claim 9 , wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of disturbed keratinization, defective syntheses of dermal components, and changes associated with aging of skin, nail, and hair, conditions, and disorders which include dryness of or looseness of skin, nail, and hair, xerosis, ichthyosis, palmar hyperkeratoses, plantar hyperkeratoses, uneven and rough surfaces of skin, nail, and hair, dandruff, Darier's disease, lichen simplex chronicus, keratoses, acne, pseudofolliculitis barbae, eczema, psoriasis, pruritus, warts, herpes, age spots, lentigines, melasmas, blemished skin, hyperkeratoses, hyperpigmented skin, abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin as well as diminished levels of such components in the dermis, stretch marks, skin lines, fine lines, wrinkles, thinning of skin, nail plate, and hair, skin thickening due to elastosis of photoaging, loss or reduction of skin, nail and hair resiliency, elasticity and recoilability, lack of skin, nail, and hair lubricants and luster, dull and older-looking skin, nails, and hair, and fragility and splitting of nails and hair. 
     
     
       11. The method of  claim 9 , wherein the cosmetic, pharmaceutical, or other topical agent is selected from the group consisting of agents that improve or eradicate age spots, keratoses, and wrinkles, local analgesics and anesthetics, antiacne agents, antibacterials, antiyeast agents, antifungal agents, antiviral agents, antidandruff agents, antidermatitis agents, antihistamine agents, antipruritic agents, antiemetics, antimotion sickness agents, antiinflammatory agents, antihyperkeratotic agents, antiperspirants, antipsoriatic agents, antiseborrheic agents, hair conditioner and hair treatment agents, antiaging and antiwrinkle agents, sunblock and sunscreen agents, skin lightening agents, depigmenting agents, vitamins, corticosteroids, tanning agents, hormones, retinoids, and topical cardiovascular agents. 
     
     
       12. The method of  claim 9 , wherein the cosmetic, pharmaceutical or other topical agent is selected from the group consisting of clotrimazole, ketoconazole, miconazole, griseofulvin, econazole, metronidazole, hydroxyzine, diphenhydramine, pramoxine, lidocaine, procaine, mepivacaine, monobenzone, erythromycin, tetracycline, clindamycin, meclocycline, hydroquinone, hydroquinone monoether, minocycline, naproxen, ibuprofen, theophylline, cromolyn, albuterol, retinol, retinyl acetate, retinyl palmitate, retinoic acid, 13-cis retinoic acid, hydrocortisone, hydrocortisone 21-acetate, hydrocortisone 17-valerate, hydrocortisone 17-butyrate, betamethasone valerate, betamethasone dipropionate, triamcinolone acetonide, fluocinonide, clobetasol propionate, benzoyl peroxide, crotamiton, propranolol, promethazine, salicylic acid, vitamin E, and vitamin E acetate. 
     
     
       13. A composition comprising (A) a pharmaceutically acceptable vehicle for topical treatment of cosmetic conditions or dermatological disorders and (B) at least 1% by total weight of the composition of at least one compound selected from the group consisting of N-acetyl aldosamines and N-acetylamino acids,
 wherein the N-acetyl aldosamine is selected from the group consisting of N-acetyl-glycerosamine, N-acetyl-erythrosamine, N-acetyl-threosamine, N-acetyl-ribosamine, N-acetyl-arabinosamine, N-acetyl-xylosamine, N-acetyl-lyxosamine, N-acetyl-allosamine, N-acetyl-altrosamine, N-acetyl-glucosamine, N-actetyl-mannosamine, N-acetyl-gulosamine, N-acetyl-idosamine, N-acetyl-galactosamine, N-acetyl-talosamine, N-acetyl-glucoheptosamine, N-acetyl-galactoheptosamine, N-acetyl-mannaheptosamine, N-acetyllactosamine, N-acetylmuramic acid, N-acetylneuramine, N-acetylneuramin lactose, N-acetyl-glyceraminic acid, N-acetyl-erythrosaminic acid, N-acetyl-threosaminic acid, N-acetyl-ribosaminic acid, N-acetyl-arbinosaminic acid, N-acetyl-xylosaminic acid, N-acetyl-lyxosaminic acid, N-acetyl-allosaminic acid, N-acetyl-altrosaminic acid, N-acetyl-glucosaminic acid, N-acetyl-mannosaminic acid, N-acetyl-gulosaminic acid, N-acetyl-idosaminic acid, N-acetyl-galactosaminic acid, N-acetyl-talosaminic acid, N-acetyl-heptoglucosaminic acid, N-acetyl-heptogalactosaminic acid, N-acetyl-heptomannosaminic acid, and N-acetyl-neuraminic acid, and isomeric or nonisomeric, free acid, salt, lactone, amide, or ester forms thereof; and    wherein the N-acetylamino acid is selected from the group consisting of N-acetyl-phenylalanine, N-acetyl-arginine, N-acetyl-lysine, N-acetyl-tryptophan, N-acetyl glycine, N-acetyl-alanine, N-acetyl-valine, N-acetyl-leucine, N-acetyl-isoleucine, N-acetyl-threonine, N-acetyl-aspartic acid, N-acetyl-proline, N-acetyl-asparagine, N-acetyl-histidine, N-acetyl-β-alanine, N-acetyl-taurine, N-acetyl-r-aminobutanoic acid, N-acetyl-hydroxyproline, N-acetyl-canavanine, N-acetyl-hydroxylysine, N-acetyl-cycloserine, N-acetyl-homoarginine, N-acetyl-norleucine, N-acetyl-norvaline, N-acetyl-homoserine, N-acetyl-methylserine, N-acetyl-hydroxyvaline, N-acetyl-ethionine, N-acetyl-methoxinine, N-acetyl-β-aminoisobutanoic acid, N-acetyl-homocysteine, N-acetyl-cysteine sulfinic acid, N-acetyl-homophenylalanine, N-acetyl-homotryptophan, N-acetyl-5-hydroxytroptamine (N-acetylserotonin), N-acetyltryptamine, N-acetyl-ornithine, N-acetyl-citrulline, N-acetyl-argininosuccinic acid, N-acetyl-dopa, N-acetyl-3-iodotyrosine, N-acetyl-3,5-diiodotyrosine, N-acetyl-3,5,3′-triiodothyronine, N-acetyl-thyroxine, N-acetyl-creatine, N-acetyl-creatinine, N-acetyl-cystine, and N-acetyl-homocystine, and isomeric or nonisomeric, free acid, salt, lactone, amide, or ester forms thereof.    
     
     
       14. A composition comprising:
 (A) a pharmaceutically acceptable vehicle for topical treatment of cosmetic conditions or dermatological disorders,    (B) a least 1% by total weight of the composition of at least one compound selected from the group consisting of N-acetyl aldosamines and N-acetylamino acids    wherein the N-acetyl aldosamine is selected from the group consisting of N-acetyl-glycerosamine, N-acetyl-erythrosamine, N-acetyl-threosamine, N-acetyl-ribosamine, N-acetyl-arabinosamine, N-acetyl-xylosamine, N-acetyl-lyxosamine, N-acetyl-allosamine, N-acetyl-altrosamine, N-acetyl-glucosamine, N-acetyl-mannosamine, N-acetyl-gulosamine, N-acetyl-idosamine, N-acetyl-galactosaminie, N-acetyl-talosamine, N-acetyl-glucoheptosamine, N-acetyl-galactoheptosamine, N-acetyl-mannaheptosamine, N-acetyllactosamine, N-acetylmuramic acid, N-acetylneuramine, N-acetylneuramin lactose, N-acetyl-glyceraminic acid, N-acetyl-erythrosaminic acid, N-acetyl-threosaminic acid, N-acetyl-ribosaminic acid, N-acetyl-arbinosaminic acid, N-acetyl-xylosaminic acid, N-acetyl-lyxosaminic acid, N-acetyl-allosaminic acid, N-acetyl-altrosaminic acid, N-acetyl-glucosaminic acid, N-acetyl-mannosaminic acid, N-acetyl-gulosaminic acid, N-acetyl-idosaminic acid, N-acetyl-galactosaminic acid, N-acetyl-talosaminic acid, N-acetyl-heptoglucosaminic acid, N-acetyl, heptogalactosaminic acid, N-acetyl-heptomannosaminic acid, and N-acetyl-N-acetylneuraminic acid, and isomeric or nonisomeric, free acid, salt, lactone, amide, and ester forms thereof; and    wherein the N-acetylamino acid is selected from the group consisting of N-acetyl-phenylalanine, N-acetyl-arginine, N-acetyl-lysine, N-acetyl-tryptophan, N-acetyl-glycine, N-acetyl-alanine, N-acetyl-valine, N-acetyl-leucine, N-acetyl-isoleucine, N-acetyl-threonine, N-acetyl-aspartic acid, N-acetyl-asparagine, N-acetyl-arginine, N-acetyl-lysine, N-acetyl-histidine, N-acetyl-phenylalanine, N-acetyl-tryptophan, N-acetyl-proline, N-acetyl-β-alanine, N-acetyl-taurine, N-acetyl-r-aminobutanoic acid, N-acetyl-hydroxyproline, N-acetyl-canavanine, N-acetyl-hydroxylysine, N-acetyl-cycloserine, N-acetyl-homoarginine, N-acetyl-norleucine, N-acetyl-norvaline, N-acetyl-homoserine, N-acetyl-methylserine, N-acetyl-hydroxyvaline, N-acetyl-ethionine, N-acetyl-methoxinine, N-acetyl-β-aminoisobutanoic acid, N-acetyl-homocysteine, N-acetyl-cysteine sulfinic acid, N-acetyl-homophenylalanine, N-acetyl-homotryptophan, N-acetyl-5-hydroxytryptamine (N-acetylserotonin), N-acetyltryptamine, N-acetyl-ornithine, N-acetyl-citrulline, N-acetyl-argininosuccinic acid, N-acetyl-dopa, N-acetyl-3-iodotyrosine, N-acetyl-3,5-diiodotyrosine, N-acetyl-3,5,3′-triiodothyronine, N-acetyl-thyroxine, N-acetyl-creatine, N-acetyl-creatinine, N-acetyl-cystine, N-acetyl-homocystine, and isomeric or nonisomeric, free acid, salt, lactone, amide, or ester forms thereof, and N-acetyl-glutamic acid and isomeric or nonisomeric, free acid, lactone, amide, or ester forms thereof; and    (C) a cosmetic, pharmaceutical, or other topical agent.    
     
     
       15. A method for treating cosmetic conditions and dermatological disorders selected from the group consisting of dryness or looseness of skin, nail and hair, ichthyosis, palmar and plantar hyperkeratoses, uneven and rough surface of nail and hair, Darier's disease, lichen simplex chronicus, keratoses, acne, pseudofolliculitis barbae, eczema, psoriasis, pruritus, warts, herpes, age spots, lentigines, melasmas, blemished skin, hyperkeratoses, hyperpigmented skin, abnormal or diminished synthesis of collagen, glycosaminoglycans, proteoglycans, and elastin as well as diminished levels of such components in the dermis, stretch marks, skin lines, fine lines, wrinkles, thinning of skin, nail plate, and hair, skin thickening due to elastosis of photoaging, loss or reduction of skin resiliency, elasticity and recoilability, lack of skin, nail, and hair lubricants and luster, dull and older-looking skin, nail, and hair, and fragility and splitting of nail and hair, the method comprising applying a composition, the composition comprising (A) a topically acceptable vehicle and (B) a therapeutically effective amount of at least one member selected from the group consisting of N-acetyl-glucosamine, N-acetyl-galactosamine, N-acetyl-proline, N-acetyl-serine, N-acetyl-glutamine, N-acetyl-tyrosine, N-acetyl-glutamic acid, and isomeric or nonisomeric, free acid, salt, lactone, amide, and ester forms thereof. 
     
     
       16. A method for treating cosmetic conditions and dermatological disorders selected from the group consisting of dryness of or looseness of skin, and nail, zerosis, ichthyosis, palmar and plantar hyperkeratoses, uneven and rough surface of skin, nail and hair, dandruff, Darier's disease, lichen simplex chronicus, keratoses, pseudofolliculitis barbae, eczema, psoriasis, itchy scalp and skin, pruritus, warts, herpes, hyperkeratoses, abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin as well as diminished levels of such components in the dermis, stretch marks, skin lines, fine lines, wrinkles, thinning of skin, nail plate, and hair, skin thickening due to elastosis of photoaging, loss or reduction of skin resiliency, elasticity and recoilability, lack of skin and nail lubricants and luster, dull and older-looking skin, the method comprising applying a composition, the composition comprising (A) a topically acceptable vehicle and (B) a therapeutically effective amount of at least one member selected from the group consisting of N-acetyl-methionine, and isomeric or nonisomeric, free acid, salt, lactone, amide, or ester forms thereof. 
     
     
       17. A method for treating cosmetic conditions and dermatological disorders selected from the group consisting of ichthyosis, palmar and plantar hyperkeratoses, Darier's disease, lichen simplex chronicus, keratoses, pseudofolliculitis barbae, eczema, psoriasis, pruritus, warts, herpes, age spots, lentigines, melasmas, blemished skin, hyperkaratoses, hyperpigmented skin, abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin as well as diminished levels of such components in the dermis, stretch marks, thinning of skin, skin thickening due to elastosis of photoaging, loss or reduction of skin resiliency, elasticity and recoilability, the method comprising applying a composition, the composition comprising (A) a topically acceptable vehicle and (B) a therapeutically effective amount of N-acetyl-cysteine, and isomeric or nonisomeric, free acid, salt, lactone, amide, and ester forms thereof. 
     
     
       18. The method of  claim 17 , wherein the composition further comprises (C) a cosmetic, pharmaceutical, or other topical agent. 
     
     
       19. The method of  claim 18 , wherein the cosmetic, pharmaceutical, or other topical agent is selected from the group consisting of agents that improve or eradicate age spots, keratoses and wrinkles, local analgesics and anesthetics, antiacne agents, antibacterials, antiyeast agents, antifungal agents, antiviral agents, antidandruff agents, antidermatitis agents, antihistamine agents, antipruritic agents, antiemetics, antimotion sickness agents, antiinflammatory agents, antihyperkeratotic agents, antiperspirants, antipsoriatic agents, antiseborrheic agents, hair conditioner and hair treatment agents, antiaging and antiwrinkle agents, sunblock and sunscreen agents, skin lightening agents, depigmenting agents, vitamins, corticosteroids, tanning agents, hormones, retinoids, and topical cardiovascular agents. 
     
     
       20. The method of  claim 18 , wherein the cosmetic, pharmaceutical or other topical agent is selected from the group consisting of clotrimazole, ketoconazole, miconazole, griseofulvin, econazole, metronidazole, hydroxyzine, diphenhydramine, pramoxine, lidocaine, procaine, mepivacaine, monobenzone, erythromycin, tetracycline, clindamycin, meclocycline, hydroquinone, hydroquinone monoether, minocycline, naproxen, ibuprofen, theophylline, cromolyn, albuterol, retinol, retinyl acetate, retinyl palmitate, retinoic acid, 13-cis retinoic acid, hydrocortisone, hydrocortisone 21-acetate, hydrocortisone 17-valerate, hydrocortisone 17-butyrate, betamethasone valerate, betamethasone dipropionate, triamcinolone acetonide, fluocinonide, clobetasol, propionate, benzoyl peroxide, crotamiton, propranolol, promethazine, salicylic acid, vitamin E, and vitamin E acetate. 
     
     
       21. A method for treating cosmetic conditions and dermatological disorders selected from the group consisting of agents that improve or eradicate age spots, keratoses and wrinkles, local analgesics and anesthetics, antiacne agents, antibacterials, antiyeast agents, antifungal agents, antiviral agents, antidandruff agents, antidermatitis agents, antihistamine agents, antipruritic agents, antiemetics, antimotion sickness agents, antiinflammatory agents, antihyperkeratotic agents, antiperspirants, antipsoriatic agents, antiseborrheic agents, hair conditioner and hair treatment agents, antiaging and antiwrinkle agents, sunblock and sunscreen agents, skin lightening agents, depigmenting agents, vitamins, corticosteroids, tanning agents, hormones, retinoids, and topical cardiovascular agents, the method comprising applying a composition, the composition comprising (A) a topically acceptable vehicle, (B) a cosmetically, pharmaceutically or other topically active agent, and (C) a therapeutically effective amount of at least one member selected from the group consisting of N-acetyl-glucosamine, N-acetyl-galactosamine, N-acetyl-mannosamine, N-acetyl-serine, N-acetyl-glutamine, N-acetyl-methionine, N-acetyl-phenylalanine, N-acetyl-tryptophan, N-acetyl-tyrosine, N-acetyl-proline, N-acetyl-arginine, N-acetyl-lysine, N-acetyl-glutamine acid, and isomeric or nonisomeric, free acid, salt, lactone, amide and ester forms thereof. 
     
     
       22. A method for treating cosmetic conditions and dermatological disorders selected from the group consisting of dryness or looseness of nail and hair; ichtyosis, palmar and plantar hyperkeratoses, uneven and rough surface of nail and hair, Darier's disease, lichen simplex chronicus, keratoses, acne, pseudofolliculitis barbae, eczema, psoriasis, pruritus, warts, herpes, age spots, lentigines, melasmas, blemished skin, hyperkaratoses, hyperpigmented skin, abnormal or diminished synthesis of collagen, glycosaminoglycans, proteoglycans, and elastin as well as diminished levels of such components in the dermis, stretch marks, skin lines, fine lines, wrinkles, thinning of skin, nail plate, and hair, skin thickening due to elastosis of photoaging, loss or reduction of skin resiliency, elasticity and recoilability, lack of skin, nail and hair lubricants and luster, dull and older-looking skin, nail and hair, and fragility and splitting of nail and hair, the method comprising applying a composition, the composition comprising (A) a topically acceptable vehicle and (B) a therapeutically effective amount of N-acetyl-glucosamine, and isomeric or nonisomeric, free acid, salt, lactone, amide and ester forms thereof. 
     
     
       23. The method of  claim 22 , wherein the composition further comprises (C) a cosmetic, pharmaceutical, or other topical agent. 
     
     
       24. The method of  claim 23 , wherein the cosmetic, pharmaceutical, or other topical agent is selected from the group consisting of agents that improve or eradicate age spots, keratoses, and wrinkles, local analgesics and anesthetics, antiacne agents, antibacterials, antiyeast agents, antifungal agents, antiviral agents, antidandruff agents, antidermatitis agents, antihistamine agents, antipruritic agents, antiemetics, antimotion sickness agents, antiinflammatory agents, antihyperkeratotic agents, antiperspirants, antipsoriatic agents, antiseborrheic agents, hair conditioner and hair treatment agents, antiaging and antiwrinkle agents, sunblock and sunscreen agents, skin lightening agents, depigmenting agents, vitamins, corticosteroids, tanning agents, hormones, retinoids, and topical cardiovascular agents. 
     
     
       25. The method of  claim 23 , wherein the cosmetic, pharmaceutical, or other topical agent is selected from the group consisting of clotrimazole, ketoconazole, miconazole, griscofulvin, econazole, metronidazole, hydroxyzinc, diphenhydramine, pramoxine, lidocaine, procaine, mepivacaine, monobenzone, erythromycin, tetracycline, clindamycin, meclocycline, hydroquinone, hydroquinone monoether, minocycline, naproxen, ibuprofen, theophylline, cromolyn, albuterol, retinol, retinyl acetate, retinyl palmitate, retinoic acid, 13-cis retinoic acid, hydrocortisone, hydrocortisone 21-acetate, hydrocortisone 17-valerate, hydrocortisone 17-butyrate, betamethasone valerate, betamethasone dipropionate, triamcinolone acetonide, fluocinonide, clobetasol propionate, benzoyl peroxide, crotamiton, propranolol, promethazine, salicylic acid, vitamin E, and vitamin E acetate. 
     
     
       26. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising ( A )  a topically acceptable vehicle and  ( B )  a therapeutically effective amount of N - acetyl - proline, its salt, or as isomeric or nonisomeric form thereof,      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of ichthyosis, palmar hyperkeratoses, plantar hyperkeratoses, Darier's disease, lichen simplex chronicus, keratoses, acne, eczema, psoriasis, pruritus, warts, herpes, age spots, lentigines, melasmas, hyperkeratoses, hyperpigmented skin and thinning of skin.     
     
     
       27. The method of  claim 26 , wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of acne, eczema, psoriasis, pruritus, age spots, lentigines, melasmas, hyperpigmented skin and thinning of skin. 
     
     
       28. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising: ( A )  a topically acceptable vehicle;  ( B )  a therapeutically effective amount of N - acetyl - proline, its salt, or as isomeric or nonisomeric forms thereof; and  ( C )  a cosmetic, pharmaceutical, or other topical agents, wherein the cosmetic, pharmaceutical, or other topical agent is selected from the group consisting of: agents that improve or eradicate age spots, keratoses, and wrinkles; local analgesics and anesthetics; antiyeast agents; antifungal agents; antiviral agents; antidermatitis agents; antihistamine agents; antipruritic agents; antiemetics; antimotion sickness agents; antiinflammatory agents; antihyperkeratotic agents; antiperspirants; antipsoriatic agents; antiseborrheic agents; antiaging and antiwrinkle agents; sunblock and sunscreen agents; skin lightening agents; depigmenting agents; corticosteroids; tanning agents; hormones; and topical cardiovascular agents; and      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: defective syntheses of dermal components; conditions and disorders selected from dryness of or looseness of skin, nail, and hair; xerosis; ichthyosis; palmar hyperkeratoses; plantar hyperkeratoses; uneven and rough surfaces of skin, nail, and hair; dandruff; Darier's disease; lichen simplex chronicus; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; warts; herpes; age spots; lentigines; melasmas; hyperkeratoses; hyperpigmented skin; abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin in the dermis; stretch marks; skin lines; fine lines; wrinkles; thinning of skin, nail plate, and hair; skin thickening due to elastosis of photoaging; loss or reduction of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair lubricants and luster; and fragility and splitting of nails and hair.     
     
     
       29. The method of  claim 28 , wherein the cosmetic, pharmaceutical or other topical agent is selected from the group consisting of clotrimazole, ketoconazole, miconazole, griseofulvin, econazole, metronidazole, hydroxyzine, diphenhydramine, pramoxine, lidocaine, procaine, mepivacaine, monobenzone, erythromycin, tetracycline, clindamycin, meclocycline, hydroquinone, hydroquinone monoether, minocycline, naproxen, ibuprofen, theophylline, cromolyn, albuterol, hydrocortisone, hydrocortisone  21 - acetate, hydrocortisone  17   - valerate, hydrocortisone  17   - butyrate, betamethasone valerate, betamethasone dipropionate, triamcinolone acetonide, fluocinonide, clobetasol propionate, crotamiton, propranolol, promethazine, salicylic acid, vitamin E and vitamin E acetate.   
     
     
       30. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising ( A )  a topically acceptable vehicle and  ( B )  a therapeutically effective amount of N - acetyl - proline amide or N - acetyl - proline ester as isomeric or nonisomeric forms thereof,      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: defective syntheses of dermal components; conditions and disorders which include dryness of or looseness of skin, nail, and hair; xerosis; ichthyosis; palmar hyperkeratoses; plantar hyperkeratoses; uneven and rough skin surfaces of skin, nail, and hair; dandruff; Darier's disease; lichen simplex chronicus; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; warts; herpes; age spots; lentigines; melasmas; hyperkeratoses; hyperpigmented skin; abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin; diminished levels of collagen, glycosaminoglycans, proteoglycans, and elastin in the dermis; stretch marks; skin lines; fine lines; wrinkles; thinning of skin, nail plate, and hair; skin thickening due to elastosis of photoaging; loss or reduction of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair lubricants and luster; and fragility and splitting of nails and hair.     
     
     
       31. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising: ( A )  a topically acceptable vehicle;  ( B )  a therapeutically effective amount of N - acetyl - proline amide or N - acetyl - proline ester as isomeric or nonisomeric forms thereof; and  ( C )  a cosmetic, pharmaceutical, or other topical agents, wherein the cosmetic, pharmaceutical, or other topical agents is selected from the group consisting of: agents that improve or eradicate age spots, keratoses, and wrinkles; local analgesics and anesthetics; antiacne agents; antibacterials; antiyeast agents; antifungal agents; antiviral agents; antidandruff agents; antidermatitis agents; antihistamine agents; antipruritic agents; antiemetics; antimotion sickness agents; antiinflammatory agents; antihyperkeratotic agents; antiperspirants; antipsoriatic agents; antiseborrheic agents; hair conditioners and hair treatment agents; antiaging and antiwrinkle agents; sunblock and sunscreen agents; skin lightening agents; depigmenting agents; vitamins; corticosteroids; tanning agents; hormones; retinoids; and topical cardiovascular agents; and      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: defective syntheses of dermal components; conditions and disorders selected from dryness of or looseness of skin, nail, and hair; xerosis; ichthyosis; plamar hyperkeratoses; plantar hyperkeratoses; uneven and rough surfaces of skin, nail, and hair; dandruff; Darier's disease, lichen simplex chronicus; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; warts; herpes; age spots; lentigines; melasmas; hyperkeratoses; hyperpigmented skin; abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin; diminished levels of collagen, glycosaminoglycans, proteoglycans, and elastin in the dermis; stretch marks; skin lines; fine lines; wrinkles; thinning of skin, nail plate, and hair; skin thickening due to elastosis of photoaging; loss or reduction of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair lubricants and luster; and fragility and splitting of nails and hair.     
     
     
       32. The method of  claim 31 , wherein the cosmetic, pharmaceutical or other topical agent is selected from the group consisting of clotrimazole, ketoconazole, miconazole, griseofulvin, econazole, metronidazole, hydroxyzine, diphenhydramine, pramoxine, lidocaine, procaine, mepivacaine, monobenzone, erythromycin, tetracycline, clindamycin, meclocycline, hydroquinone, hydroquinone monoether, minocycline, naproxen, ibuprofen, theophylline, cromolyn, albuterol, retinol, retinyl acetate, retinyl palmitate, retinoic acid,  13 - cis retinoic acid, hydrocortisone, hydrocortisone  21   - acetate, hydrocortisone  17   - valerate, hydrocortisone  17   - butyrate betamethasone valerate, betamethasone, dipropionate, triamcinolone acetonide, fluocinonide, clobetasol propionate, benzoyl peroxide, crotamiton, propranolol, promethazine, salicylic acid, vitamin E and vitamin E acetate.   
     
     
       33. The method of  claim 30 , wherein the cosmetic conditions and dermatological disorders are selected from acne, pruritus, eczema or psoriasis. 
     
     
       34. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising ( A )  a topically acceptable vehicle and  ( B )  a therapeutically effective amount of N - acetyl - tyrosine as free acid, salt, amide, ester, isomeric or nonisomeric form thereof,      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: defective syntheses of dermal components; ichthyosis; palmar hyperkeratoses; plantar hyperkeratoses; dandruff; Darier's disease; lichen simplex chronicus; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; warts; hyperkeratoses; abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin; diminished levels of collagen, glycosaminoglycans, proteoglycans, and elastin in the dermis; stretch marks; skin lines; fine lines; wrinkles; thinning of skin, nail plate, and hair; skin thickening due to elastosis of photoaging; loss or reduction of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair lubricants and luster; and fragility and splitting of nails and hair.     
     
     
       35. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising: ( A )  a topically acceptable vehicle;  ( B )  a therapeutically effective amount of N - acetyl - tyrosine as free acid, salt, amide, ester, isomeric or nonisomeric form thereof; and  ( C )  a cosmetic, pharmaceutical, or other topical agents, wherein the cosmetic, pharmaceutical, or other topical agent is selected from the group consisting of: agents that improve or eradicate keratoses and wrinkles; local analgesics and anesthetics; antiacne agents; antibacterials; antiyeast agents; antifungal agents; antidandruff agents; antidermatitis agents; antihistamine agents; antipruritic agents; antiemetics; antimotion sickness agents; antiinflammatory agents; antihyperkeratotic agents; antiperspirants; antipsoriatic agents; antiseborrheic agents; hair conditioners and hair treatment agents; antiaging and antiwrinkle agents; sunblock and sunscreen agents; vitamins; corticosteroids; tanning agents; hormones; retinoids; and topical cardiovascular agents; and      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: defective syntheses of dermal components; conditions and disorders selected from dryness of or looseness of skin, nail, and hair; xerosis; ichthyosis; palmar hyperkeratoses; plantar hyperkeratoses; uneven and rough surfaces of skin, nail, and hair; dandruff; Darier's disease; lichen simplex chronicus; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; warts; herpes; hyperkeratoses; abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin; diminished levels of collagen, glycosaminoglycans, proteoglycans, and elastin in the dermis; stretch marks; skin lines; fine lines; wrinkles; thinning of skin, nail plate, and hair; skin thickening due to elastosis of photoaging; loss or reduction of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair lubricants and luster; and fragility and splitting of nails and hair.     
     
     
       36. The method of  claim 35 , wherein the cosmetic, pharmaceutical or other topical agent is selected from the group consisting of clotrimazole, ketoconazole, miconazole, griseofulvin, econazole, metronidazole, hydroxyzine, diphenhydramine, pramoxine, lidocaine, procaine, mepivacaine, monobenzone, erythromycin, tetracycline, clindamycin, meclocycline, minocycline, naproxen, ibuprofen, theophylline, cromolyn, albuterol, retinol, retinyl acetate, retinyl palmitate, retinoic acid,  13 - cis retinoic acid, hydrocortisone, hydrocortisone  21   - acetate, hydrocortisone  17   - valerate, hydrocortisone  17   - butyrate, betamethasone valerate, betamethasone dipropionate, triamcinolone acetonide, fluocinonide, clobetasol propionate, benzoyl peroxide, crotamiton, propranolol, promethazine, salicylic acid, vitamin E and vitamin E acetate.   
     
     
       37. The method of  claim 34 , wherein the N- acetyl tyrosine is N - acetyl tyrosine ester, and the cosmetic conditions and dermatological disorders are selected from eczema or psoriasis.   
     
     
       38. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising ( A )  a topically acceptable vehicle and  ( B )  a therapeutically effective amount of N - acetyl - glutamine as free acid, salt, amide, ester, isomeric or nonisomeric form thereof,      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: defective syntheses of dermal components; palmar hyperkeratoses; plantar hyperkeratoses; Darier's disease; lichen simplex chronicus; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; warts; herpes; age spots; lentigines; melasmas; hyperkeratoses; hyperpigmented skin; abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin; diminished levels of collagen, glycosaminoglycans, proteoglycans, and elastin in the dermis; stretch marks; skin lines; fine lines; wrinkles; skin thickening due to elastosis of photoaging; and fragility and splitting of nails and hair.     
     
     
       39. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising: ( A )  a topically acceptable vehicle;  ( B )  a therapeutically effective amount of N - acetyl - glutamine as free acid, salt, amide, ester, isomeric or nonisomeric forms thereof; and  ( C )  a cosmetic, pharmaceutical, or other topical agents, wherein the cosmetic, pharmaceutical, or other topical agent is selected from the group consisting of: agents that improve or eradicate age spots, keratoses, and wrinkles; local analgesics and anesthetics; antiacne agents; antibacterials; antiyeast agents; antifungal agents; antiviral agents; antidermatitis agents; antihistamine agents; antipruritic agents; antiemetics; antimotion sickness agents; antiinflammatory agents; antihyperkeratotic agents; antiperspirants; antipsoriatic agents; antiseborrheic agents; antiaging and antiwrinkle agents; sunblock and sunscreen agents; skin lightening agents; depigmenting agents; corticosteroids; tanning agents; hormones; and topical cardiovascular agents; and      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: defective syntheses of dermal components; conditions and disorders selected from dryness of or looseness of skin, nail, and hair; xerosis; ichthyosis; palmar hyperkeratoses; plantar hyperkeratoses; uneven and rough surfaces of skin, nail, and hair; dandruff; Darier's disease; lichen simplex chronicus; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; warts; herpes; age spots; lentigines; melasmas; hyperkeratoses; hyperpigmented skin; abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin; diminished levels of collagen, glycosaminoglycans, proteoglycans, and elastin in the dermis; stretch marks; skin lines; fine lines; wrinkles; thinning of skin, nail plate, and hair; skin thickening due to elastosis of photoaging; loss or reduction of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair lubricants and luster; and fragility and splitting of nails and hair.     
     
     
       40. The method of  claim 39 , wherein the cosmetic, pharmaceutical or other topical agent is selected from the group consisting of clotrimazole, ketoconazole, miconazole, griseofulvin, econazole, metronidazole, hydroxyzine, diphenhydramine, pramoxine, lidocaine, procaine, mepivacaine, monobenzone, erythromycin, tetracycline, clindamycin, meclocycline, hydroquinone, hydroquinone monoether, minocycline, naproxen, ibuprofen, theophylline, cromolyn, albuterol, hydrocortisone, hydrocortisone  21 - acetate, hydrocortisone  17   - valerate, hydrocortisone  17   - butyrate, betamethasone valerate, betamethasone dipropionate, triamcinolone acetonide, fluocinonide, clobetasol propionate, benzoyl peroxide, crotamiton, propranolol, promethazine, salicylic acid.   
     
     
       41. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising ( A )  a topically acceptable vehicle and  ( B )  a therapeutically effective amount of N - acetyl - neuraminic acid or N - acetyl - muramic acid as free acid, salt, amide, ester, isomeric or nonisomeric forms thereof,      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: ichthyosis; Darier's disease; lichen simplex chronicus; pseudofolliculitis barbae; eczema; psoriasis; pruritus; hyperpigmented skin; and stretch marks.     
     
     
       42. The method of  claim 41 , wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: eczema; psoriasis; pruritus; hyperpigmented skin; and stretch marks. 
     
     
       43. The method of  claim 42 , wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of psoriasis and hyperpigmented skin. 
     
     
       44. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising: ( A )  a topically acceptable vehicle;  ( B )  a therapeutically effective amount of N - acetyl - neuraminic acid or N - acetyl - muramic acid as free acid, salt, amide, ester, isomeric or nonisomeric forms thereof; and  ( C )  a cosmetic, pharmaceutical, or other topical agent, wherein the cosmetic, pharmaceutical, or other topical agent is selected from the group consisting of: local analgesics and anesthetics; antibacterials; antiyeast agents; antifungal agents; antidermatitis agents; antihistamine agents; antipruritic agents; antiinflammatory agents; antiperspirants; antipsoriatic agents; antiseborrheic agents; skin lightening agents; depigmenting agents; vitamins; corticosteroids; tanning agents; hormones; and retinoids; and      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: ichthyosis; Darier's disease; lichen simplex chronicus; pseudofolliculitis barbae; eczema; psoriasis; pruritus; hyperpigmented skin; and stretch marks.     
     
     
       45. The method of  claim 44 , wherein the cosmetic, pharmaceutical or other topical agents is selected from the group consisting of clotrimazole, ketoconazole, miconazole, griseofulvin, econazole, metronidazole, hydroxyzine, diphenhydramine, pramoxine, lidocaine, procaine, mepivacaine, monobenzone, erythromycin, tetracycline, clindamycin, meclocycline, hydroquinone, hydroquinone monoether, minocycline, naproxen, ibuprofen, theophylline, cromolyn, albuterol, retinol, retinyl acetate, retinyl palmitate, retinoic acid,  13 - cis retinoic acid, hydrocortisone, hydrocortisone  21   - acetate, hydrocortisone  17   - valerate, hydrocortisone  17   - butyrate, betamethasone valerate, betamethasone dipropionate, triamcinolone acetonide, fluocinonide, clobetasol propionate, benzoyl peroxide, crotamiton, propranolol, promethazine, salicylic acid, vitamin E and vitamin E acetate.   
     
     
       46. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising ( A )  a topically acceptable vehicle and  ( B )  a therapeutically effective amount of N - acetyl - galactosamine, as isomeric or nonisomeric forms thereof,      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: ichthyosis; palmar hyperkeratoses; plantar hyperkeratoses; Darier's disease; lichen simplex chronicus; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; warts; herpes; age spots; lentigines; melasmas; hyperkeratoses; hyperpigmented skin; abnormal or diminished syntheses of collagen and elastin; diminished levels of collagen and elastin in the dermis; stretch marks; skin lines; fine lines; wrinkles; thinning of skin and nail plate; skin thickening due to elastosis of photoaging; loss or reduction of skin and nail resiliency, elasticity, and recoilability; lack of skin and nail lubricants and luster; and fragility and splitting of nails.     
     
     
       47. The method of  claim 46 , wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: ichthyosis; palmar hyperkeratoses; plantar hyperkeratoses; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; age spots; lentigines; melasmas; hyperkeratoses; hyperpigmented skin; stretch marks; skin lines; fine lines; wrinkles; and thinning of skin. 
     
     
       48. The method of  claim 47 , wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: age spots; lentigines; melasmas; and hyperpigmented skin. 
     
     
       49. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising: ( A )  a topically acceptable vehicle;  ( B )  a therapeutically effective amount of N - acetyl - galactosamine, as isomeric or nonisomeric forms thereof; and  ( C )  a cosmetic, pharmaceutical, or other topical agent, wherein the cosmetic, pharmaceutical, or other topical agent is selected from the group consisting of: agents that improve or eradicate age spots, keratoses, and wrinkles; local analgesics and anesthetics; antiacne agents; antibacterials; antiyeast agents; antifungal agents; antiviral agents; antidermatitis agents; antihistamine agents; antipruritic agents; antiemetics; antimotion sickness agents; antiinflammatory agents; antihyperkeratotic agents; antiperspirants; antipsoriatic agents; antiseborrheic agents; antiaging and antiwrinkle agents; sunblock and sunscreen agents; skin lightening agents; depigmenting agents; vitamins; corticosteroids; tanning agents; hormones; retinoids; and topical cardiovascular agents; and      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: defective syntheses of dermal components; conditions and disorders selected from dryness of or looseness of skin, nail, and hair; xerosis; ichthyosis; palmar hyperkeratoses; plantar hyperkeratoses; uneven and rough surfaces of skin, nail, and hair; dandruff; Darier's disease; lichen simplex chronicus; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; warts; herpes; age spots; lentigines; melasmas; hyperkeratoses; hyperpigmented skin; abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin; diminished levels of collagen, glycosaminoglycans, proteoglycans, and elastin in the dermis; stretch marks; skin lines; fine lines; wrinkles; thinning of skin, nail plate, and hair; skin thickening due to elastosis of photoaging; loss or reduction of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair lubricants and luster; and fragility and splitting of nails and hair.     
     
     
       50. The method of  claim 49 , wherein the cosmetic, pharmaceutical or other topical agent is selected from the group consisting of clotrimazole, ketoconazole, miconazole, griseofulvin, econazole, metronidazole, hydroxyzine, diphenhydramine, pramoxine, lidocaine, procaine, mepivacaine, monobenzone, erythromycin, tetracycline, clindamycin, meclocycline, hydroquinone, hydroquinone monoether, minocycline, naproxen, ibuprofen, theophylline, cromolyn, albuterol, retinol, retinyl acetate, retinyl palmitate, retinoic acid,  13 - cis retinoic acid, hydrocortisone, hydrocortisone  21   - acetate, hydrocortisone  17   - valerate, hydrocortisone  17   - butyrate, betamethasone valerate, betamethasone dipropionate, triamcinolone acetonide, fluocinonide, clobetasol propionate, benzoyl peroxide, crotamiton, propranolol, promethazine, salicylic acid, vitamin E and vitamin E acetate.   
     
     
       51. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising ( A )  a topically acceptable vehicle and  ( B )  a therapeutically effective amount of N - acetyl - mannosamine, as isomeric or nonisomeric forms thereof,      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: ichthyosis; palmar hyperkeratoses; plantar hyperkeratoses; Darier's disease; lichen simplex chronicus; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; warts; herpes; age spots; lentigines; melasmas; hyperkeratoses; hyperpigmented skin; abnormal or diminished syntheses of collagen and elastin; diminished levels of collagen and elastin in the dermis; stretch marks; skin lines; fine lines; wrinkles; thinning of skin and nail plate; skin thickening due to elastosis of photoaging; loss or reduction of skin and nail resiliency, elasticity, and recoilability; lack of skin and nail lubricants and luster; and fragility and splitting of nails.     
     
     
       52. The method of  claim 51 , wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: ichthyosis; palmar hyperkeratoses; plantar hyperkeratoses; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; age spots; lentigines; melasmas; hyperkeratoses; hyperpigmented skin; stretch marks; skin lines; fine lines; wrinkles; and thinning of skin. 
     
     
       53. The method of  claim 52 , wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: age spots; lentigines; melasmas; and hyperpigmented skin. 
     
     
       54. A method for treating cosmetic conditions and dermatological disorders comprising topically applying a composition, the composition comprising: ( A )  a topically acceptable vehicle;  ( B )  a therapeutically effective amount of N - acetyl - mannosamine, as isomeric or nonisomeric forms thereof; and  ( C )  a cosmetic, pharmaceutical, or other topical agent, wherein the cosmetic, pharmaceutical, or other topical agent is selected from the group consisting of: agents that improve or eradicate age spots, keratoses, and wrinkles; local analgesics and anesthetics; antiacne agents; antibacterials; antiyeast agents; antifungal agents; antiviral agents; antidermatitis agents; antihistamine agents; antipruritic agents; antiemetics; antimotion sickness agents; antiinflammatory agents; antihyperkeratotic agents; antiperspirants; antipsoriatic agents; antiseborrheic agents; antiaging and antiwrinkle agents; sunblock and sunscreen agents; skin lightening agents; depigmenting agents; vitamins; corticosteroids; tanning agents; hormones; retinoids; and topical cardiovascular agents; and      wherein the cosmetic conditions and dermatological disorders are selected from the group consisting of: defective syntheses of dermal components; conditions and disorders selected from dryness of or looseness of skin, nail, and hair; xerosis; ichthyosis; palmar hyperkeratoses; plantar hyperkeratoses; uneven and rough surfaces of skin, nail, and hair; dandruff; Darier's disease; lichen simplex chronicus; keratoses; acne; pseudofolliculitis barbae; eczema; psoriasis; pruritus; warts; herpes; age spots; lentigines; melasmas; hyperkeratoses; hyperpigmented skin; abnormal or diminished syntheses of collagen, glycosaminoglycans, proteoglycans, and elastin; diminished levels of collagen, glycosaminoglycans, proteoglycans, and elastin in the dermis; stretch marks; skin lines; fine lines; wrinkles; thinning of skin, nail plate, and hair; skin thickening due to elastosis of photoaging; loss or reduction of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair resiliency, elasticity, and recoilability; lack of skin, nail, and hair lubricants and luster; and fragility and splitting of nails and hair.     
     
     
       55. The method of  claim 54 , wherein the cosmetic, pharmaceutical or other topical agent is selected from the group consisting of clotrimazole, ketoconazole, miconazole, griseofulvin, econazole, metronidazole, hydroxyzine, diphenhydramine, pramoxine, lidocaine, procaine, mepivacaine, monobenzone, erythromycin, tetracycline, clindamycin, meclocycline, hydroquinone, hydroquinone monoether, minocycline, naproxen, ibuprofen, theophylline, cromolyn, albuterol, retinol, retinyl acetate, retinyl palmitate, retinoic acid,  13 - cis retinoic acid, hydrocortisone, hydrocortisone  21   - acetate, hydrocortisone  17   - valerate, hydrocortisone  17   - butyrate, betamethasone valerate, betamethasone dipropionate, triamcinolone acetonide, fluocinonide, clobetasol propionate, benzoyl peroxide, crotamiton, propranolol, promethazine, salicylic acid, vitamin E and vitamin E acetate.   
     
     
       56. A method for treating pruritus comprising topically applying a composition, the composition comprising ( A )  a topically acceptable vehicle and  ( B )  a therapeutically effective amount of N - acetyl - cysteine as free acid, salt, amide, ester, isomeric or nonisomeric forms thereof.