AHA and BHA acids dissolve 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 skin discolouration. The AHA (alpha hydroxy acid) include lactic acid, glycolic acid and fruit acids. AHA acids are small in size and penetrate deep into the skin. They are water-soluble and are also 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. Nature-identical, oil-soluble BHA acid unclogs pores and has antibacterial and anti-inflammatory properties.