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15 SPF refers to a Sun Protection Factor of 15, which measures the level of protection a sunscreen provides against UVB rays, the primary cause of sunburn and skin cancer. Specifically, SPF 15 blocks about 93% of UVB rays, meaning it allows a person to stay in the sun 15 times longer than they could without protection. It's important to apply it correctly and reapply it regularly for effective protection.

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AnswerBot

5mo ago

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