Vitamin D trials did not establish cardiovascular protection
A pooled analysis of placebo-controlled trials found no significant reduction in cardiovascular events, cardiovascular deaths, heart attacks or deaths from heart attacks.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Across the included adult trials, vitamin D supplementation did not significantly lower cardiovascular event rates compared with placebo. Results for cardiovascular deaths, heart attacks and heart-attack deaths also failed to show significant benefit. These findings do not support a cardiovascular-prevention claim, while leaving uncertainty about the exact size and direction of any effect.
An abstract-based reading cannot assess how dose, starting vitamin D status or follow-up length affected the findings because these details are absent. The reported uncertainty also permits effects in either direction.
What researchers found
Any cardiovascular event
Vitamin D versus placebo; follow-up not reported. This compares event risks, not event percentages: one means equal risk. The estimate favors vitamin D slightly, but the interval allows lower or higher risk.
What the trials tested
Researchers pooled adult trials in which participants were randomly assigned to vitamin D or placebo. They also assessed study bias, but the abstract does not report the individual trials' quality ratings.
How to read the uncertainty
A result that is not statistically significant leaves the exact effect uncertain. Here, the range includes both benefit and harm, so the analysis cannot establish identical effects of supplementation and placebo.
The original publication
Vitamin D supplementation and cardiovascular disease events: a systematic review and pooled meta-analysis of randomized clinical trials.
Qudah T, Al-Damook N, Abu Hait K et al.
Appl Physiol Nutr Metab · 2026
- PubMed ID
- 41183312
- Record checked
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