The Claim

Vitamin D supplementation does not significantly affect the risk of serious adverse events, with an odds ratio of 0.96 (95% CI 0.90–1.04) across 38 trials, indicating it is generally safe for use in preventing acute respiratory infections.

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.

Quantitative
1 study reviewed
In plain English

Taking vitamin D supplements doesn't really change your chance of having serious side effects, and it's considered safe for helping prevent colds and other breathing infections.

See the scientific wording

Vitamin D supplementation does not significantly affect the risk of serious adverse events, with an odds ratio of 0.96 (95% CI 0.90–1.04) across 38 trials, indicating it is generally safe for use in preventing acute respiratory infections.

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 vitamin D supplements and found they don't cause serious side effects, just like the claim says, so it supports the idea that vitamin D is safe.

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.