Malic Acid is one of the alpha-hydroxy acids (AHAs) found in fruits. It is able to interrupt the attachment of corneocytes of the epidermis and exfoliate dull and old cells from the surface of the skin.
Malic Acid increases skin renewal rate by inducing apoptosis of sun-damaged cells. MA also has antibacterial activity e.g. against Listeria protecting from Cutaneous listeriosis.