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Does vitamin C cure the common cold?

BUSTED
133+ in PubMed PubMed results Last checked April 2026
Vitamin C does not cure the common cold, though it may slightly reduce duration and severity.
Large-scale reviews show vitamin C supplementation does not prevent colds in the general population and has no consistent therapeutic effect when taken after symptoms start. Regular vitamin C supplementation may modestly reduce cold duration by 8% in adults and 14% in children, but this small benefit doesn't constitute a 'cure.'
Overall confidence
90%
RCT quality
85%
Expert consensus
95%
RCTs found
133+ in PubMed
Largest trial
11,306 participants
Date range
1966–2023
Effect size
small
Key studies
Cochrane Database Syst Rev · 2013
No reduction in cold incidence for general population; modest 8% duration reduction in adults
PubMed 23440782 ↗
BMC Public Health · 2023
Vitamin C reduces cold severity by 15% but greater effect on severe vs mild symptoms
PubMed 38082300 ↗
Am J Trop Med Hyg · 2020
Zinc supplementation reduces cold duration by 2.25 days, vitamin C effects less clear
PubMed 32342851 ↗
Caveats
Vitamin C may be beneficial for people exposed to extreme physical stress (marathon runners, soldiers). Effects are modest and don't prevent colds in most people.

People also ask

Should I take vitamin C when I feel a cold coming on?
Research shows no consistent benefit from therapeutic vitamin C taken after symptoms start.
Does vitamin C prevent colds if taken regularly?
Not in the general population, though it may reduce duration by a small amount.
Are there any groups where vitamin C helps prevent colds?
Yes, people under extreme physical stress like marathon runners showed 50% reduction in cold risk.
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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.