Vitamin A is an indispensable nutrient for the human body. Experts have found that after transforming Vitamin A, a series of retinoids, which are valuable for medicinal and skin care, can be extracted, that is, retinoic acids, which mainly include alcohol, acid and others. Similar active ingredients.

At the same concentration, they show their different characteristics: in terms of use effect and irritation, A acid; A alcohol. Studies have shown that the effect of A alcohol is only 1/20 of that of A acid, while stability and mildness Just the opposite. In the penetration of the skin, A acid A alcohol. Medical experiments show that when the skin surface is coated with alcohol A products, five levels of the skin, including the dermis, are detected in tretinoin, and A acid can only work on the most superficial skin.

Alcohol A is directly converted into A acid by enzymes on the skin surface after application. The remaining part penetrates into the dermis and stimulates the production of collagen in the dermis. Although its effect is only 1/20 of A acid, it is still effective. It is very effective in repairing skin photo-aging, so it is very popular in the skin care industry and has become one of the essential ingredients in high-end skin care products for wrinkle removal, anti-aging and freckle removal. Because tretinoin can regulate cell metabolism and the rate of exfoliation of stratum corneum cells, so as to remove acne, inhibit the formation of acne, and can also inhibit local inflammation, reduce the possibility of acne marks and acne scars. It has always been the support of anti-acne drugs. Put child drugs.

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