Includes retinol, retinaldehyde, and retinyl esters. The famous doctor Dr. Albert Kligman introduced them to cosmetics that year, and he was also the dermatologist who first proposed the concept of "cosmeceutical".

Vitamin A is one of the essential nutrients for the human body. Vitamin A in our body usually comes from the vitamin A precursor in food: carotene, which is cut into two cis vitamin A aldehydes by the BCMO1 enzyme in our body. Lack of vitamin A in the body can cause symptoms such as dry and rough skin, night blindness, corneal dryness and softening.
 
After the "marrying" skin care products, the various effects of Vitamin A on the skin have been explored one by one, which is simply Mary Su in the skin care ingredients: wrinkle, whitening, acne, exfoliation, anti-aging, and improve skin barrier function In addition to sun protection, it has almost all the functions of skin care products. The only disadvantage is that the temper is too violent, and the irritation is not low. Retinol will directly jump back after photolysis, which will cause skin damage.