Evidence-based nutrition, in plain English — every entry sourced from clinical research.

Vitamin D supplementation to prevent acute respiratory infections: systematic review and meta-analysis of individual participant data

BMJ, 2017 · Systematic review & meta-analysis (individual participant data)

Across the pooled trials, vitamin D supplementation modestly reduced the risk of acute respiratory infection, with the clearest benefit in people who were most deficient at the start.

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