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Peeling Light on Sunscreens
Dummy Shields:
The sun protection factor (SPF) you
see on the label of sunscreens is misleading. It's not a measure of sun protection but of sunburn protection and UVB light that causes it. The longer light waves in the ultraviolet A (UVA) part of the spectrum actually penetrate deeper into the skin and may even cause more harm than sunburn-producing UVB. Moreover, the main part of the UVA spectrum passes through glass and UVB in a car and indoors. Sunscreens that claim to block both UVA and UVB light are increasingly popular.But whether many of them actually do so enough to warrant labels like "broad spectrum" sunscreens and even as sun blocks is debatable. Dermatologists usually reserve the term sun block for lotions with ingredients that physically block light from penetrating the skin, such as zinc oxide or titanium dioxide. So if you're looking for UVA and
UVB protection, don't pay too much attention to the front of the bottle. Inspect the fine print on the back. The active ingredients with the best reputation for fending off UVA light are avobenzone, titanium dioxide, and zinc oxide. Still it's not quite that simple. Some researchers see a problem with avobenzone. In experimental situations it breaks down in sunlight - not a good attribute for a sunscreen ingredient. Therefore, the lotions containing zinc oxide and titanium dioxide may be the best bet. The particles are very fine, so they're not like the white zinc oxide that lifeguards and cricketers paint their noses with. Still, some find these lotions gritty. Regardless of which sunscreen you use, slather the stuff. People rarely use enough to get the lotion's full protection.