The Claim

Vitamin D supplementation does not significantly reduce the overall risk of acute respiratory infections in the general population, with an odds ratio of 0.94 (95% CI 0.88–1.00) across 40 randomized controlled trials involving 61,589 participants.

Source: Vitamin D supplementation to prevent acute respiratory infections: systematic review and meta-analysis of stratified aggregate data

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
45score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Cause and effect
1 study reviewed
In plain English

Taking vitamin D supplements doesn't really help prevent common colds or similar infections for most people, based on a big review of studies.

See the scientific wording

Vitamin D supplementation does not significantly reduce the overall risk of acute respiratory infections (ARIs) in the general population, with an odds ratio of 0.94 (95% CI 0.88–1.00) across 40 randomized controlled trials involving 61,589 participants, indicating no statistically protective effect.

What the research says

1 study

  1. Study: Vitamin D supplementation to prevent acute respiratory infections: systematic review and meta-analysis of stratified aggregate data

    The study looked at whether vitamin D supplements prevent colds and flu and found they don't really help, which matches what the claim says.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.