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Does vitamin C cure the common cold?

BUSTED
170+ in PubMed PubMed results Last checked May 2026
Vitamin C does not cure the common cold but may modestly reduce duration and severity.
Multiple high-quality systematic reviews show vitamin C supplementation does not prevent colds in the general population and does not cure them. However, regular vitamin C supplementation can modestly reduce cold duration by about 8% in adults and 14% in children, and may reduce symptom severity by about 15%.
Overall confidence
90%
RCT quality
95%
Expert consensus
95%
RCTs found
170+ in PubMed
Largest trial
11,306 participants
Date range
1966–2023
Effect size
small
Key studies
Cochrane Review (Hemilä & Chalker) · 2013
Vitamin C reduced cold duration by 8% in adults but did not prevent colds in general population
PubMed 23440782 ↗
BMC Public Health meta-analysis · 2023
Vitamin C reduced severity of common cold symptoms by 15% compared to placebo
PubMed 38082300 ↗
BMJ Global Health review · 2021
Vitamin C supplementation reduced ARI risk by 4% and shortened symptom duration by 9%
PubMed 33472840 ↗
Caveats
Vitamin C may be more beneficial for people under extreme physical stress (marathon runners, soldiers) and therapeutic effects when taken at cold onset are inconsistent.

People also ask

Should I take vitamin C to prevent colds?
Not recommended for general population, but may help if you're under extreme physical stress
Will vitamin C help if I already have a cold?
Evidence for therapeutic use is inconsistent, but regular supplementation may reduce duration
How much does vitamin C actually help?
Modest effects - reduces duration by less than a day and severity by about 15%
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BustMyMyth synthesizes published RCT evidence. It is not medical advice. Always consult a qualified healthcare professional. Sources: PubMed/MEDLINE, Cochrane Library, ClinicalTrials.gov.