This paper describes recent data on the effects of various skin formulations containing hydroxyacids (HAs) and related products on\r\nsun-exposed skin. The most frequently used classes of these products, such as a- and �Ÿ-hydroxyacids, polyhydroxy acids, and bionic\r\nacids, are reviewed, and their application in cosmetic formulations is described. Special emphasis is devoted to the safety evaluation\r\nof these formulations, particularly on the effects of their prolonged use on sun-exposed skin.We also discuss the important contribution\r\nof cosmetic vehicles in these types of studies. Data on the effects of HAs on melanogenesis and tanning are also included.\r\nUp-to-date methods and techniques used in those explorations, as well as selected future developments in the cosmetic area, are\r\npresented.
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