Research
Micronutrients & recovery
Vitamin D supplementation reduces the incidence of acute respiratory tract infections, with the effect being more significant in patients with severe vitamin D deficiency (<10 ng/mL).
Taking vitamin D supplements can help reduce the risk of getting acute respiratory infections. This benefit is strongest if you currently have severe vitamin D deficiency. If your levels are normal, the benefit may be smaller.
GoodSupportsHIGH confidence
A recent meta-analysis of 25 trials in 2017 showed reducing incidence of acute respiratory tract infection after vitamin D supplementation (OR 0.88, 95% CI 0.81e0.96), which is more significant in patients with severe vitamin D deficiency (<10 ng/mL).
Why this rating
Based on a large meta-analysis of 25 trials.
Source
Vitamin D and health - The missing vitamin in humans
Szu‐Wen Chang et al. · Pediatrics & Neonatology · 2019
DOI 10.1016/j.pedneo.2019.04.007
narrative_reviewCited 393×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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