The VI DERM® Ultra A is a .1% Tretinoin Cream that also combines Vitamin C and Vitamin E. Tretinoin is the acidic form of Vitamin A, which works to resurface and treat acne prone skin. It will renew texture of aging and mature skin. Excellent for treating wrinkles and sun damaged skin. It works by repairing damage to the deep layers of the skin, restoring elasticity by enhancing the production of collagen and elastin. The Vitamin C is an antioxidant that has been proven to increase collagen synthesis, which is essential to maintaining healthy skin. Vitamin E helps protect body tissue from damage by unstable substances called free radicals.