The best high SPF sunscreen The new FDA regulations that go into effect at the end of the year will make SPF 50 the highest available. That's because there's only a small difference between SPF 45 and SPF 100 -- and the government doesn't want consumers to have a false sense of protection. However, there is some benefit to opting for a high number of sun protection. "There was a recent study that suggested that since people do not use adequate amounts of sunscreen, those who wear a higher level of SPF are better protected," says Downie. "You have to apply a thick coat, reapply every two hours, and stay in the shade when you can." Regardless of the number on the bottle, you should use a shot-glass-sized amount of sunscreen for your body and a teaspoon for your face every time you apply.
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