Vitamin D and Testosterone: What's the Link?

Short answer: in men with confirmed vitamin D deficiency, correcting it can modestly improve testosterone. In men with normal levels, supplementing doesn't raise testosterone further. The Singapore-specific twist is that deficiency is common despite the climate.

The evidence

Several studies (Pilz et al. and others) have shown modest testosterone improvements in vitamin D-deficient men receiving supplementation. The effect appears to be deficiency correction rather than a pharmacological boost — men with already-normal levels don't see further gains.

Why Singapore men are often deficient

Despite year-round sun, modern indoor lifestyles, office work, sun-avoidance, and use of sunscreen mean vitamin D deficiency is common in Singaporean adults. The climate doesn't help if you're rarely outside.

What to do

• If you have symptoms or risk factors, ask your doctor to test 25-hydroxyvitamin D
• If deficient (typically below 50 nmol/L), supplementation is straightforward
• Typical dose: 1,000–2,000 IU daily for most men; higher for documented severe deficiency
• Re-check after 3 months

When to see a doctor

Book a confidential consultation with a Singapore-licensed doctor on Noah if you'd like to discuss vitamin D in the context of your broader symptoms.