To find the best sunscreen, read the label, dermatologists say

05/10/2011 | Washington Post, The

Sunscreens that tout a sun protection factor of 100 are only incrementally better than sunscreens with an SPF of 30 and may be more likely to cause irritation, says Dr. Warwick Morison, a professor of dermatology at Johns Hopkins University School of Medicine. Moreover, the SPF rating is related only to UVB rays, but UVA rays can cause "immune suppression, connective tissue damage, premature aging and wrinkles," and skin cancers, according to David Andrews, a senior scientist at Environmental Working Group. Products that contain zinc oxide or titanium dioxide protect best against UVA rays, dermatologist Dr. Elizabeth Tanzi says.

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