Andrew Huberman· PhD
So supplementation does play a major role, not only for people with darker skin that aren't outside all the time, but for everyone.
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The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
So supplementation does play a major role, not only for people with darker skin that aren't outside all the time, but for everyone.
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for vitamin D so darker skinned people are going to have um lower vitamin D levels uh
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
And if you put an African American in Chicago, they're in deep trouble because in a northern latitude, if you have a dark skin, you're in trouble. You're not making your vitamin D, and you need to do something about it.
also latitude where you live so living in a Northern latitude places like 37 degrees above the equator um 7 months out of the Year UVB is not hitting the surface so these people are not making vitamin D for a good portion of the year
it is also in those living in northern latitudes where less UVB radiation reaching the atmosphere means less of it reaching our skin to facilitate the production of vitamin D and it is in darker skin people wear synthesis of vitamin D is naturally reduced as a biological bargain made by melanin a natural sunscreen which protects us from the damaging effects of UV radiation
Anything that blocks UVB radiation from the sun also blunts our skin's ability to produce vitamin D. That includes clothing, sunscreen, melanin, which is responsible for darker skin color, living in Northern latitude and staying indoors.
also depending on where you live so a northern latitude um UVB radiation can't even reach the atmosphere you know several months out of the year