UVA protection labeling and in vitro testing methods.

The importance of adequate UVA protection is apparent with improved understanding of UVA-induced skin damage. This has led to the development of new sunscreen ingredients. A number of regulatory bodies or experts from the industry and academia have proposed methods to assess the efficacy of sunscreens against UVA radiation. In addition different proposals have been made regarding the labeling for UVA protection. The purpose of this paper is to describe several in vitro methods for measuring UVA protection of sunscreen products and to consider their validity. The different proposals in terms of UVA labeling are also presented and discussed. This review illustrates the need for standardization of the measurement conditions and harmonization to convey to consumers the most appropriate information on UVA protection.