Is a body lotion with SPF 15 as effective as my beach sunblock?

A broad-spectrum body lotion with an SPF of 15 is better than nothing but not as protective as the broad-spectrum sunblock (with the harder-core sunscreens and blockers) that you might wear poolside. Most daily moisturizers with SPF add one or two chemical sunscreens and maybe one chemical UVA blocker (remember that SPF only measures protection from UVB rays). Usually that chemical sunscreen is benzophone 3 or oxybenzone, which guards only against short UVA wavelengths.

If you're going to be spending time in direct sunlight (not just a day at the beach but a ride in a convertible or lunch at an outdoor café), opt for a broad-spectrum product that contains chemical UVB absorbers and either physical blockers (titanium dioxide or zinc oxide) or chemical UVA protectors like Mexoryl or avobenzone that prevent longer wavelengths from reaching the dermis.

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