2020 Volume 65 Issue 6 Pages 376-382
According to the Permission Standard for Cosmetic Products 1999, cosmetics are classified into 11 types, such as basic cosmetics and cosmetics for cleaning, and the basic cosmetics have been formulated so as to compensate for the deterioration of moisturizing function of the stratum corneum. On the other hand, in recent years, ceramide has formed a layered structure in a corneal layer, so that component having a barrier function against stimulation has been incorporated. Since ceramide is a trace ingredient in the Natural world, it was found that the barrier function was restored by measuring the TEWL change in continuous use by using Sodium Dilauramidoglutamide Lysine having a similar structure to ceramide. On the other hand, cosmetics for cleaning contain ingredients for removing soil, but excessive detergency leads to deterioration of skin function and skin irritation and therefore,amino acid surfactants having appropriate detergency have been used. Though there are many problems such as foaming and viscosity, it was found that the problem can be solved by examining the optimum ratio.
