Cleopatra knew that female donkey milk (containing L(+)-Lactic acid) was good for her. A number of a-hydroxy acids, including glycolic, lactic (L(+) and D(-) forms) citric, hydroxybutyric and malic acids, have been evaluated for their stinging potential on sensitive skin, the ability to increase skin cell renewal, and their ability to improve moisture content and reduce lines and wrinkles over a six-week period...