Peter Attia· MD
those who have more naturally occurring melanin have more built- in protection from UV radiation which means less UV conversion for vitamin D so darker skinned people are going to have um lower vitamin D levels
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
those who have more naturally occurring melanin have more built- in protection from UV radiation which means less UV conversion for vitamin D so darker skinned people are going to have um lower vitamin D levels
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