Does SPF 30 Really Protect You All Day?

Photos were posted on 17 May 2015 at 9:02pm

There’s a lot of confusion about what SPF really means. So let’s just clear something up: It is not an indicator of how long you can stay out in the sun.

“Studies have shown that SPF’s efficacy stays steady for about an hour, and then begins to drop after an hour because UV rays break down many sunscreen ingredients,” says Jill Weinstein, a dermatologist and instructor of clinical dermatology at Northwestern University Feinberg School of Medicine in Chicago. It’s why you should reapply sunscreen every two hours or after you sweat or swim (whichever comes first).

Here’s what SPF really…

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