Learn The world of sunscreen is vast and confusing. On this page, I hope to consolidate some of the more interesting bits. After More Than A Decade, FDA Still Won’t Allow New Sunscreens Laboratory testing of sunscreens on the US market finds lower in vitro SPF values than on labels and even less UVA protection Understanding Skin Pigmentation The many different chemical UV blockers Sunscreen layer thickness considerations during application to the skin Benzene contamination in sunscreen products