Alpha hydroxy acids are generaly considered to be one of the cornestones of medical grade skin care (cosmeceuticals and chemical peels). The AHAs most commonly used in cosmetic applications are commonly called fruit acids (including lactic acid, glycolic acid and citric acid). AHAs have an effect on the superficial (epidermal) and deeper (dermal) layers of the skin. At the epidermal layer they encourage regeneration of the stratum corneum. This is caused by a shedding of the existing corneocytes. Certain AHAs are part of the NMFs (Natural Moisturizing Factor) present in the stratum corneum and are capable of increasing the content in water of the epidermis’ superficial layers. AHAs also act on the dermis by increasing the proliferation of fibroblasts, the synthesis of collagen, mucopolysaccharides and hyaluronic acid and increase skin thickness without detectable inflammation. Peels containing AHAs reduce fine wrinkling, treat areas of dryness, reduce pigmentation, aid in the control of acne, smooth rough dry skin and improve the texture of sun-damaged skin.