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Does SPF 30 have twice as much sun protection as SPF 15?

April 26, 2017SPF Sun twice

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Does SPF 30 have twice as much sun protection as SPF 15?

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Not even close. SPF protection does not increase proportionately with a designated SPF number. For instance, in a product with an SPF of 30, 97% of UVB rays are deflected, while in an SPF 15 product deflects 93%. Frequent application and use of a sunscreen that provides good UVA and UVB protection is far more effective than paying more money for a product with an SPF factor over 30.