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What does the SPF number on sunscreens mean?

April 26, 2017mean SPF sunscreens

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What does the SPF number on sunscreens mean?

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The sunburn protection factor, or SPF, measures protection against only ultraviolet radiation B, UVB, which causes burning, says Henry Lim, chairman of dermatology at Henry Ford Hospital in Detroit. YOUR HEALTH: Even treatable skin cancer is no sunny experience TANNING BEDS: Link to melanoma grows stronger The SPF level doesn’t measure protection against ultraviolet radiation A, UVA, which causes aging of the skin, says Otis Brawley, chief medical officer of the American Cancer Society. Both types of UV rays cause cancer, he says.