By: Mike Dawson
Wearing sunscreen can help stave off burns, premature aging, and skin cancer. You know this. But what you may not know is that the whole sunscreen-labeling system was established way back in 1978. And even after some milquetoast tweaks by the FDA this year, it remains confusing and kind of bullshit-and may give you a false sense of security while you bake in the sun.
Of course, you'd think a sunscreen with SPF 30 would be twice as strong as one with SPF 15, right? It isn't. An SPF 15 blocks 93 percent of UVB rays (the cause of those skin-slapping red burns); SPF 30 blocks only 97. And SPF 50 blocks just 98 percent of UVB rays.
But UVB rays are only half the problem. There are also UVAs, which drive much deeper into your skin, causing wrinkles and increasing your risk of cancer. (Exposure to both types of rays simultaneously and unprotected can increase that risk even more.)
Many U.S. sunblock brands sayRead More »from SPF 30 Vs. SPF 15 - What's the REAL Deal?