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SPF testing an "accurate reflection" of ingredient photostability -- CTFA rep.

This article was originally published in The Tan Sheet

Executive Summary

SUNSCREEN SPF TESTING ACCURATELY REFLECTS INGREDIENT PHOTOSTABILITY, CTFA said, noting photostability has been a concern raised often with the introduction of more technically advanced UVA sunscreen ingredients such as microfine zinc oxide, microfine titanium dioxide and avobenzone. James Johnson, PhD, University of Tennessee-Memphis College of Pharmacy, speaking on behalf of the Cosmetic, Toiletry & Fragrance Association at a June 3 FDA "feedback" meeting on sunscreens, maintained the current SPF testing method provides "an accurate reflection of the performance of the product."
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