AHAs and BHAs loosen dead skin cells and thus promote the process of cell renewal. Both active ingredients are used as enzymatic or chemical peelings. They promote blood circulation, fight impurities and can even out discoloration of the skin. AHAs (Alpha Hydroxy Acid) include lactic acid, glycolic acid, and fruit acids. AHAs are small in molecular size and penetrate deeply into the skin. They are water-soluble and are considered humectants that stop transepidermal water loss. They promote collagen synthesis and smooth the complexion. BHA stands for beta hydroxy acid or salicylic acid and is considered an effective active ingredient in the treatment of pimples and blackheads. The nature-identical, oil-soluble acid cleanses clogged pores and has antibacterial and anti-inflammatory properties.