What are alpha hydroxy acids?
Alpha hydroxy acids, better known as fruit acids, include glycolic acid, citric acid, and malic acid. Using fruit acids for cosmetic purposes has a long history, too, and even the legendary Cleopatra was rumored to have used wine resins on her face to improve the appearance of her skin. Alpha hydroxy acids work by extending their effect through the protective barrier of the epidermis and into the living skin cells of the dermis. However, penetration is designed to be limited to the upper layers of the dermis.
