The Claim
Vitamin D supplementation at daily doses of 400–1000 IU may reduce the risk of acute respiratory infections, with an odds ratio of 0.70 (95% CI 0.55–0.89) based on 10 trials involving 2,305 participants, though higher doses showed no significant benefit and this finding was not robustly supported by multivariable analysis.
What the research says
Challenges is higher
Challenge is ahead, but a single strong supporting study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Taking a small daily dose of vitamin D might help lower your chances of getting colds or other breathing infections, but taking more doesn't seem to help extra, and scientists aren't totally sure about this yet.
See the scientific wording
Vitamin D supplementation at daily doses of 400–1000 IU may reduce the risk of acute respiratory infections, with an odds ratio of 0.70 (95% CI 0.55–0.89) from 10 trials involving 2,305 participants, but higher doses showed no significant benefit and this finding was not robustly supported by multivariable analysis.
What the research says
1 studyThe study looked at vitamin D for colds and found it didn't really help overall, which goes against the claim that small daily doses reduce infection risk.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.