Key Ingredients: Glycolic Acid is a type of Alpha Hydroxy Acid (AHA). It has a small molecular structure allowing it to penetrate the surface of the skin more readily. Lactic Acid is a type of Alpha Hydroxy Acid (AHA) which increases the water-holding ability of the corneum layer of the skin, allowing for an improvement in fine lines. Salicylic Acid is a type of Beta Hydroxy Acid (BHA) which encourages the sloughing of dead skin cells and has the ability to penetrate into the pore.