This Is the Only Sunscreen Article You Need to Read

TIME

How proficient are you in sunscreen-ese? According to a new survey in JAMA Dermatology, most people don’t understand much of what’s written on a lotion label.

Researchers at Northwestern University Feinberg School of Medicine wanted to test people’s knowledge of sunscreen, so they surveyed 114 people who came to the dermatology clinic during the summer of 2014. Even though 93% of them had purchased a bottle in the last year, most people showed important gaps in their sunscreen smarts.

1. UVB rays

“People think that SPF equals everything,” says Dr. Roopal Kundu, one of the study’s authors and a dermatologist at Northwestern University Feinberg School of Medicine. And it does count for a lot: the sun protection factor measures a sunscreen’s ability to filter UVB rays, which are related to sunburn and skin cancer. But SPF only measures UVB rays; it doesn’t tell you anything about protection from…

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