A313 is the best pharmacy grade French vitamin A used in the treatment of fine lines. The skin naturally converts A313 into a mild retinoic acid approximately 10-15 minutes after application. The exfoliating effect minimizes fine lines and wrinkles with repeated use. Retinol, a type of retinoid, is a Vitamin A derivative. It is generally used to remove skin wrinkles, eliminate dark spots on the skin and smooth the skin. As the skin ages, skin cells do not develop and begin to accumulate at the top of the skin. Retinol helps thin and smooth the top layer of the skin. Retinol is also included in anti-acne products because retinol is effective in opening clogged pores and preventing possible acne formation.