Does vitamin D prevent colds and flu?
Not enough data. Meta-analyses report mixed results, so current evidence on whether vitamin D supplementation prevents colds and respiratory infections is inconclusive. Based on 5 scientific papers. Confidence: 60/100.
There isn't enough research yet to judge it.
Why the evidence says so
- Some studies report protective effects against respiratory infections.
- Other studies find no significant overall effect from vitamin D supplementation.
The evidence, claim by claim
01Not enough dataVitamin d supplementation prevents colds and respiratory infections.
Vitamin d supplementation prevents colds and respiratory infections.
“Vitamin D supplementation prevents colds and respiratory infections.”
The meta-analyses provided show mixed results on whether vitamin D supplementation prevents acute respiratory infections: some studies report protective effects, and others find no significant overall effect.
Sources
Efficacy of Vitamin D Supplements in Prevention of Acute Respiratory Infection: A Meta-Analysis for Randomized Controlled Trials
2022 · Meta-Analysis · Hae-Eun Cho, Seung‐Kwon Myung
Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant data
2017 · Meta-Analysis · Adrian R. Martineau, David A. Jolliffe
High-dose oral vitamin D supplementation for prevention of infections in children aged 0 to 59 months: a systematic review and meta-analysis
2023 · Meta-Analysis · Janet Adede Carboo, Robin Dolman
Vitamin D supplementation to prevent acute respiratory infections: individual participant data meta-analysis
2019 · Meta-Analysis · Adrian R. Martineau, David A. Jolliffe
The Effects of Vitamin D Supplementation on Respiratory Infections in Children under 6 Years Old: A Systematic Review
2023 · Systematic Review · Larisa Mihaela Marusca, Gowry Reddy
What the evidence doesn't show
To establish efficacy, further randomized controlled trials with standardized dosing regimens are needed.
Questions people ask
Meta-analyses report mixed results, so current evidence on whether vitamin D supplementation prevents colds and respiratory infections is inconclusive.
Some studies report protective effects against respiratory infections, while others find no significant overall effect from vitamin D supplementation.
To establish efficacy, further randomized controlled trials with standardized dosing regimens are needed.
EvidenceLens compared the claim with 5 papers from its research index and weighed the evidence for and against. Verdicts describe the strength of the evidence and are not medical advice.
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5 scientific papersReviewed by a human editor on . Evidence check generated . Read how we check claims, including what the verdicts do and do not mean.
Verdicts describe the strength of published research, not medical, legal or financial advice. AI-assisted analysis can contain errors; open the sources before making important decisions. Spotted a problem? Request a correction.