Supplement vitamin D3 and adjust the dose to reach a blood level around 40–60 ng/mL, rather than taking a fixed one-size-fits-all amount. A common rule of thumb is that 1,000 IU raises serum vitamin D by about 5 ng/mL, so someone starting near 20 ng/mL may need roughly 4,000 IU daily to get into range. The goal is to correct low levels while avoiding underdosing, especially for people who get plenty of sun but still test low.
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“We should take CoQ10. We should take omega-3 fatty acids. We should take vitamin D.”
huberman · How Women Can Improve Their Fertility & Hormone Health | Dr. Natalie Crawford · Apr 13, 2026 · 1:41:31 · open ↗