You're Probably Not Applying Enough Sunscreen Cela says that the number-one sun care mistake people make is that they rarely apply enough sunscreen.
"In determining the SPF of a sunscreen, one ounce of sunscreen is used for an average person. That's about a shot glass worth," she says. "If you don't apply that much each time you will be under-protected."
She strongly recommends a broad-spectrum sunscreen with an SPF of at least 25.
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