Sunscreens with a rating of SPF 100 may be more effective than ones rated SPF 50, according to a randomized trial, even though the Food and Drug Administration says that any SPF above 50 offers no additional protection.

The study, in the Journal of the American Academy of Dermatology, included 199 men and women given two tubes of sunscreen, one marked “right” and one “left.” They applied the cream to the indicated side of the face and neck, and then went about their normal activities on a sunny day at a ski resort. One of the tubes contained SPF 50 cream, the other SPF 100.

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