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Thu Jun 05, 2008 3:28 pm  |
The sunscreen standards for UVA protection are very confusing. Each country seems to have its own sunscreen standard for UVA protection, and it is very difficult to understand what each sunscreen standard means. A sunscreen label might claim to have UVA protection, but because of lax or meaningless regulations, the sunscreen may provide very little UVA protection. The lax or meaningless UVA standards hurt both the people who need good UVA protection, and they hurt the sunscreen manufacturer who does make an excellent UVA protection product. For this reason, I am proclaiming the Persistent Pigment Darkening Method (PPD) method for measuring UVA protection as the gold standard by which all the other UVA standards are measured in this discussion.
Sunscreens with high PPD ratings do the best to protect those of us with extreme sun sensitivities against UVA light. So assume we want sunscreens with UVA ratings with a PPD greater than 15. ( An estimate of the alternate UVA method's ability to measure a PPD greater than 15 is listed in Table 1. So sunscreens with a PPD rating, a UVA/UVB rating, or a Boots Star rating can provide UVA protection equivalent to a PPD of 15 or greater. Some UVA standards that cannot measure a PPD of 15 or greater include: Japanese PA+++ standard and Australian UVA standard, and the U.S. (no standard). |
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Recent Karin Herzog convert. |
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