Glycolic acid is thought to be the most effective AHA as it has the smallest molecular structure of any AHA and can therefore penetrate the surface of the skin. It is glycolic acid which is now acceptted as being the leading AHA for use in cosmetic products.Why is Glycolic Acid beneficial for the skin?Many skin problems are associated with “hyperkeratinisation”, which is the accumulation of excess dead cells on the surface of the skin. This in turn can contribute to the dull, course, rough, blotchy and dry appearance of ageing skin.Glycolic acid helps to loosen the bonds between excess dead cells accumulating on the surface of the skin. The loosening of the surface skin cells leads to a continuing microscopic exfoliation, reduction of hyperkeratinisation and ongoing improvement in the appearance of the skin. Acne is associated with hyperkeratinisation around the hair follicles causing blockage of oil glands. Reducing hyperkeratinisation helps to unblock pores and improve the appearance of acne-prone skin.Glycolic acid is available in concentrated strength exfoliator solutions for use by skin care professionals and in lower concentrations for daily application at home. With the use of glycolic acid products at home the skin will feel softer and smoother within a few weeks. A more rapid improvement in the appearance of the skin is obtained by the combination of professional treatments with glycolic acid in the salon and daily application of glycolic acid products at home. 50% of the improvement in skin appearance from the glycolic acid programme results fromthe use of the products at home.Glycolic acid products are effective on areas of the body where there is the appearance of skin ageing, excessive dryness, ingrown hairs or rough cuticles. These areas are most commonly the face, neck, decolletage, arms, back of hands and legs.16 oz. bottle.