SPF Demystified: Why Bigger Numbers Aren't a Free Pass
TL;DR Summary
Dermatologists explain that SPF mainly measures UVB protection; higher numbers don’t double protection (SPF 30 blocks ~97% UVB, SPF 50 ~98%, SPF 100 ~99%). Choose broad-spectrum, water-resistant formulas and reapply every two hours (or after swimming/sweating). Combine with shade, hats, sunglasses, and protective clothing for best sun protection.
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