While UV-B rays cause sunburn , UV-A rays penetrate deeper into the skin, lowering our resistance to skin cancers and causing skin to age. The SPF number or Sun Protection Factor on sunscreens refers only to UV-B protection . … As a result, more sun care products are available that use titanium dioxide or zinc oxide, but there is more to the story. Serious concerns have been raised about the safety of these ingredients used in most commercially available sunscreen …
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Eat To Live: Sensible Sun Exposure
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