/WHAT_IT_IS
Vitamin D regulates calcium and influences testosterone production, immune function, and mood. Deficiency is extremely common, especially in men with low sun exposure.
/NORMAL_RANGE
Deficient: <20 ng/mL. Insufficient: 20–30. Sufficient: 30–80. Optimal: 40–60 for most adults.
What does high Vit D mean?
- +Excessive supplementation. True toxicity rare below 100 ng/mL.
What does low Vit D mean?
- +Low sun exposure, dark skin, obesity, malabsorption, anticonvulsants.
/ON_TRT
Low vitamin D associates with low testosterone in observational studies; supplementation modestly raises T in deficient men. If you're on TRT and your vitamin D is below 40, supplement with 2,000–5,000 IU daily (with K2 for cardiovascular protection).
/RELATED
FAQ
/01Does vitamin D raise testosterone?+
In men who are deficient (<30 ng/mL), correcting vitamin D modestly raises testosterone — usually by 50–100 ng/dL. In men who are already replete, additional vitamin D has no T-raising effect.
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