External dermal composition for anti-ageing and method for producing the same

Abstract

The present invention has an object to provide an external dermal composition for anti-ageing, which prevents or improves apparent skin problems such as wrinkles, fine wrinkles, blemishes, and saggings caused by increasing age or ageing; and maintains or improves the barrier function and the hyaluronic acid production in the skin. The object is solved by providing an external dermal composition for anti-ageing, which contains an aqueous medium as a base material and one or more ingredients selected from L-ascorbic acid, derivatives thereof, and their salts as an effective ingredient(s).

1 . A method for improving skin-turnover, which comprises a step of administering one or more members selected from the group consisting of L-ascorbic acid, an L-ascorbic acid derivative, and a salt thereof as an effective ingredient(s). 
     
     
         2 . The method of  claim 1 , wherein said L-ascorbic acid derivative is a glycosyl-, acyl-, or phosphorylated-derivative of L-ascorbic acid. 
     
     
         3 . The method of  claim 2 , wherein said glycosyl-derivative of L-ascorbic acid is 2-O-α-D-glucosyl-L-ascorbic acid. 
     
     
         4 . The method of  claim 1 , wherein said salt is a sodium salt. 
     
     
         5 . The method of  claim 1 , which is to maintain or improve the barrier function and the hyaluronic acid production in the skin. 
     
     
         6 . The method of  claim 1 , which is to prevent or improve wrinkles, fine wrinkles, blemishes, or saggings in the skin. 
     
     
         7 . The method of  claim 1 , wherein said one or more members selected from the group consisting of L-ascorbic acid, an L-ascorbic acid derivative, and a salt thereof is in a form of an external dermal composition.