SPF Numbers

11:12 AM

"To give you an idea of what the numbers mean, an SPF 15 sunscreen blocks 94 percent of UVB rays, SPF 30 blocks 97 percent, SPF 50 blocks 98 percent, and SPF 100 blocks 99 percent. No sunscreen is a 100 percent guarantee, and some doctors argue that ditching your bottle of 30 or 50 for a higher SPF could lead to a false sense of security about staying in the sun longer without reapplying."

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