protection factor , which tells you how effectively the product blocks UVB rays , the ones primarily responsible for sunburn . But there ' s no rating system yet for how well a sunscreen stops UVA rays , which penetrate deeper into the base layer of the skin and can cause dangerous cell changes . The FDA has proposed a new sunscreen rule that would include label revisions for UVA . Until they ' re in place , David J . Leffell , M . D ., professor of dermatology and surgery at Yale School of Medicine , recommends choosing a broad-spectrum sunscreen , which offers greater UVA ( as well as UVB ) protection . To check if a product fits the bill , look for UVA-screening ingredients , including avobenzone ( Parsol 1789 ) and ecamsule ( Mexoryl SX ). Or use zinc oxide or titanium dioxide , which are physical blocks that protect against all rays . But the FDA cautions that , no matter how broadspectrum , sunscreen isn ' t enough — you must wear sun-protective clothing , too .
6 . If you live in Fargo , ND , and always use sunscreen , your risk of melanoma can be greater than your friend ' s in Miami : For years , researchers had puzzled over the fact that sunscreen users seemed more likely to develop melanoma than those who didn ' t protect themselves . But now scientists from the University of California , San Diego , may have figured out why . In a recent study , they found that the unexpected connection applies mainly to people with fair complexions in northern latitudes ( north of Philadelphia or Boulder ). They speculate that sunscreen users in northern areas never feel the burning that would warn them to cover up or get out of the sun because their lotions do a good job of
protection factor , which tells you how effectively the product blocks UVB rays , the ones primarily responsible for sunburn . But there ' s no rating system yet for how well a sunscreen stops UVA rays , which penetrate deeper into the base layer of the skin and can cause dangerous cell changes . The FDA has proposed a new sunscreen rule that would include label revisions for UVA . Until they ' re in place , David J . Leffell , M . D ., professor of dermatology and surgery at Yale School of Medicine , recommends choosing a broad-spectrum sunscreen , which offers greater UVA ( as well as UVB ) protection . To check if a product fits the bill , look for UVA-screening ingredients , including avobenzone ( Parsol 1789 ) and ecamsule ( Mexoryl SX ). Or use zinc oxide or titanium dioxide , which are physical blocks that protect against all rays . But the FDA cautions that , no matter how broadspectrum , sunscreen isn ' t enough — you must wear sun-protective clothing , too .
6 . If you live in Fargo , ND , and always use sunscreen , your risk of melanoma can be greater than your friend ' s in Miami : For years , researchers had puzzled over the fact that sunscreen users seemed more likely to develop melanoma than those who didn ' t protect themselves . But now scientists from the University of California , San Diego , may have figured out why . In a recent study , they found that the unexpected connection applies mainly to people with fair complexions in northern latitudes ( north of Philadelphia or Boulder ). They speculate that sunscreen users in northern areas never feel the burning that would warn them to cover up or get out of the sun because their lotions do a good job of
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