How to Measure UVA Protection Afforded by Sunscreen Products

Dominique Moyal

Disclosures

Expert Rev Dermatol. 2008;3(3):307-313. 

In This Article

Five-year View

Available methods have been reviewed by regulatory agencies and industry over the past decade in an effort to adopt optimum methods for evaluation of UVA efficacy and to provide appropriate information to the consumer. More data are now available showing the importance to accurately standardize the conditions of measurements with a view to improve the reproducibility of the results. It can be expected that harmonization can be reached within the next 5 years through international organizations. Adoption of the in vivo PPD method or the in vitro PPD method appears to be the best approach for harmonization of the assessment of UVA protection. In addition, the optimum ratio of UVA and UVB protection should be specified. The UVA-PF/SPF ratio of at least a third, as defined by the European Commission,[104] should be universally adopted as a harmonized standard of consumer protection.

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