include an array of AHA's that instantly condition and improve the appearance of skin, with gentle brightening and clarifying effects that make pores look refined. Lactic acid is an AHA that exfoliates on the surface of skin by breaking down the material that holds dead skin together, allowing it to shed naturally. Malic acid exfoliates from unripened fruit. Citric Acid exfoliates from citrus fruits. Mandelic acid is an AHA with a larger molecule size and more gentle than other acids.