If we lived in pristine, temperature-controlled labs, SPF 15 would be adequateif not optimalprotection against sunburn (caused by UVB rays) and skin aging and cancer (caused by UVA and UVB rays).
But we live in the real (sweaty, splashy, windy) world, and we don't use as much sunscreen as we should. In fact, the protection most of us get from SPF 15 is more like SPF 3 to 7. That's why the American Academy of Dermatology recommends using broad-spectrum SPF 30.
It's great advice, but it doesn't clear up all the sun-safety confusion. So we asked the experts to solve your toughest quandaries, one by one.
50 Natural Sunscreens
Sunscreen Questions AnsweredWhat's the hig