The Claim
Vitamin C supplementation reduces the incidence of common cold by approximately 50% (relative risk 0.50, 95% confidence interval 0.38-0.66) in specific high-stress populations including marathon runners, skiers, and soldiers undergoing sub-arctic exercises.
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 cuts your chances of catching a cold in half if you're doing really tough activities like running marathons, skiing, or military training in freezing cold places.
See the scientific wording
Vitamin C supplementation reduces common cold incidence by approximately 50% (RR 0.50, 95% CI 0.38-0.66) in specific high-stress populations including marathon runners, skiers, and soldiers undergoing sub-arctic exercises.
What the research says
1 studyStudy: Vitamin C for preventing and treating the common cold.
The study looked at whether taking vitamin C pills every day helps prevent colds, especially in people like marathon runners or soldiers in cold places. It found that for these groups, vitamin C cuts the chance of getting a cold in half, just like the claim says.
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.