Does vitamin D affect testosterone?
Vitamin D deficiency is common and associated with lower testosterone in observational data; supplementation in deficient men produces modest improvement. Repleting vitamin D is a no-cost lever before pharmacologic decisions.
Full answer
Observational studies associate lower 25-hydroxyvitamin D with lower testosterone. Interventional data are mixed but consistent enough to support repleting vitamin D in deficient men, especially given the broad bone, immune, and metabolic benefits. Most adults reach 40–60 ng/mL on 2,000–5,000 IU daily of vitamin D3 with adequate magnesium and dietary vitamin K2. Vitamin D repletion is a no-cost lever that is addressed before or alongside hormone optimization decisions.
Educational. Not a substitute for individualized provider review.
- Methodology — Primary source · oMeds
- Reviewed by Dr. Laura Purdy, MD, MBA · Clinical Director, oMeds · Last reviewed 2026-06-03