The SPF Question: Which one do we choose?
Wow, I was happy to find this article. Living in Miami can be a bit of a challenge when it comes to skin protection! Actually, this is an issue no matter where you go! Really, though- they now have SPF which is 100. That's just nuts. This article does a nice job of making sense of the mess...
Skin Deep
My favorite bit:
No SPF, not even 100+, offers 100 percent protection. What’s more, both UVA and UVB radiation can lead to skin cancer, which is why dermatologists now advise using sunscreens with an SPF of at least 15 and UVA-fighting ingredients like an avobenzone that doesn’t degrade in light or Mexoryl SX.The difference in UVB protection between an SPF 100 and SPF 50 is marginal. Far from offering double the blockage, SPF 100 blocks 99 percent of UVB rays, while SPF 50 blocks 98 percent. (SPF 30, that old-timer, holds its own, deflecting 96.7 percent).
Confused by SPF? Take a Number
My favorite bit:
No SPF, not even 100+, offers 100 percent protection. What’s more, both UVA and UVB radiation can lead to skin cancer, which is why dermatologists now advise using sunscreens with an SPF of at least 15 and UVA-fighting ingredients like an avobenzone that doesn’t degrade in light or Mexoryl SX.The difference in UVB protection between an SPF 100 and SPF 50 is marginal. Far from offering double the blockage, SPF 100 blocks 99 percent of UVB rays, while SPF 50 blocks 98 percent. (SPF 30, that old-timer, holds its own, deflecting 96.7 percent).
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