The Claim
Vitamin C supplementation at doses of 1 gram per day or higher reduces the severity of common colds by 15% (95% confidence interval 9–21%) in healthy individuals, as determined by a pooled analysis of 15 comparisons from 10 randomized controlled trials.
What the research says
Supports is higher
Support is ahead, but a single strong opposing 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 vitamin C pills every day might make your colds less severe, according to some studies that looked at healthy people.
See the scientific wording
Vitamin C supplementation at doses ≥1 g/day reduces the severity of common colds by 15% (95% CI 9–21%) in healthy individuals, based on pooled analysis of 15 comparisons from 10 randomized controlled trials.
What the research says
1 studyStudy: Vitamin C reduces the severity of common colds: a meta-analysis
This study looked at the same vitamin C dose and same group of people as the claim, and found exactly the same 15% reduction in cold severity, so it supports the claim.
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.