Effect of vitamin D supplementation on cardiovascular outcomes: an updated meta-analysis of RCTs.

Objective: To evaluate the effect of vitamin D supplementation on cardiovascular outcomes.

Methods: After searching different databases, we retrieved and included randomized controlled trials on long-term supplementation of vitamin D (≥1-year intervention) and reporting cardiovascular outcomes. We calculated risk ratio (RR) with 95% confidence intervals (CI) for dichotomous outcomes.