Vitamin D
The sunshine vitamin essential for immune function, mood, and bone health.
Mentioned by Peter Attia and Rhonda Patrick
Overview
Vitamin D is technically a hormone that your body produces from sunlight. Deficiency is extremely common, especially in northern latitudes. It affects immune function, mood, bone density, and much more.
What experts say
Peter Attia
Longevity physician
"Vitamin D deficiency is incredibly common. I aim for blood levels of 40-60 ng/mL and dose accordingly, usually 5000 IU daily."
Rhonda Patrick
Biomedical scientist
"Vitamin D is technically a hormone and it affects the expression of over 1000 genes. Deficiency is linked to everything from immune function to mood."
Our take
Get your levels tested. Most people need 2,000-5,000 IU daily to maintain optimal levels (40-60 ng/mL). Take with fat for absorption, and consider adding K2 if supplementing long-term.
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