Does vitamin D deficiency cause high blood pressure?
Last updated September 3, 2026.
Low vitamin D tracks with higher blood pressure in observational studies, but trials and genetic (Mendelian randomization) analyses have not shown that deficiency causes hypertension or that supplements reliably lower pressure. The biology is plausible, vitamin D receptors line blood vessels and vitamin D touches the renin system, which is why the hypothesis keeps getting tested. But the 2024 HUNT study triangulation found the association without causal support, matching the broader trial literature. The best current reading: deficiency is a marker of the cluster that actually raises pressure (older age, higher weight, less activity, less sunlight), not the cause. So the right moves: check a level if you have risk factors for deficiency and replete it for bone and general health, but treat blood pressure with the proven levers, sodium, weight, exercise, alcohol, and medication when indicated. Vitamin D megadoses for blood pressure are not a strategy; at high doses they bring their own problems, including kidney stones and calcium issues.
What to do
- Test if at risk: limited sun, darker skin, older age, obesity.
- Treat deficiency for bones: not as a blood pressure strategy.
- Do not expect BP drops from supplements: trials have not delivered them.
- Use the proven levers: sodium, weight, exercise, alcohol, medication.
- Avoid megadoses: kidney stones and high calcium are real harms.
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