Shelves full of lotions, sticks, sprays. Does it really matter which sunscreen you grab?

Turns out, it does. For one thing, a recent study revealed that popular doesn’t mean protective.

According to a July study in the JAMA Dermatology journal, 40 percent of the best-rated sunscreens on Amazon didn’t meet guidelines of the American Academy of Dermatology. The less-impressive sunscreens didn’t resist water or sweat well, according to doctors at the Northwestern University Feinberg School of Medicine.

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