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Lactic acid is an alpha hydroxy acid that is derived from milk. As a result of its relatively greater molecular weight, its keratolytic action is milder than that of glycolic acid, thus preventing skin irritations. When applied, lactic acid cleaves the bonds between keratinocytes on the external layer, thus reducing them and leading to gradual regeneration. This results in a mild but effective exfoliation of the horny layer and in the simultaneous regeneration of cells. It stimulates the production of collagen and glycosaminoglycans that make up the intercellular material. Another advantage provided by lactic acid is that it naturally hydrates the skin; this action results in increased formation of ceramides, thus enhancing the function of the keratin barrier. The combination of mild exfoliation, regeneration and hydration that it offers makes it an ideal peeling treatment for sensitive and dehydrated skins and a good choice for skins that undergo chemical peeling for the first time. The 50% concentration of lactic acid in combination with the pH result in targeted actions and indications.