Mexoryl: a review of an ultraviolet a filter.

Author: D'Souza G, Evans GR, Plastic Surgery Educational Foundation Technology Assessment Committee

Author affiliation: Aesthetic and Plastic Surgery Institute, The University of California, Irvine, Orange, Calif. 92868, USA.

Publication date & source: 2007.09.15, Plast Reconstr Surg., 120(4):1071-5.

Publication type: Review

It is widely known that ultraviolet light causes skin damage and melanoma. Different wavelengths of ultraviolet light penetrate the skin at different depths, causing varying levels of damage. Higher wavelengths tend to penetrate deeper and, consequently, are thought to induce a myriad of skin conditions, thereby playing a significant role in the photoaging process. Sunscreens containing the ultraviolet A blocker Mexoryl are important in impeding ultraviolet A light, potentially reducing many of the characteristics of skin aging and preventing biochemical changes that can lead to nonmelanoma carcinoma. Until now, sunscreen products sold in the United States focused on blocking ultraviolet B light. Those that did provide ultraviolet A filtering contained physical blocks (zinc oxide or titanium dioxide) or the chemical block Parsol 1789 (avobenzone). These broad-spectrum sunscreens have limitations, such as degradation under ultraviolet exposure, that resulted in decreased effectiveness. Mexoryl, a novel ultraviolet A filter, provides efficient ultraviolet A coverage, better photostability, and enhanced water resistance. Sunscreens containing Mexoryl are widely used in Europe and Canada. It was not until July 24, 2006, that the U.S. Food and Drug Association approved the compound.

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