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SPF does not mean time in the sun

Sunscreen science
SPF 30 does not mean 30 minutes. It measures UVB protection, not a timer ⏱️
Sunscreen science
UVA ages, UVB burns. Broad-spectrum sunscreen aims to cover both rays ☀️
Sunscreen science
Mineral filters sit on top and mostly absorb plus scatter UV. Chemical filters absorb UV and turn it into heat 🌞
Sunscreen science
Quick checklist: broad-spectrum, SPF 30+, enough for your body, apply 15 to 30 minutes before, reapply every 2 hours and after swimming or sweating 🔖

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labmuffin.com [3]

mdanderson.org [5]

uchicagomedicine.org [6]

skincancer.org [31]

mdanderson.org [19]

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