Verdicts
Does vitamin C stop you catching colds?
Decades of Cochrane trials find no meaningful drop in cold risk for ordinary adults, only a modest shortening of colds once they start.
TBy The Evidence Desk · 28 July 2026 · 2 min read
Decades of Cochrane trials find no meaningful drop in cold risk for ordinary adults, only a modest shortening of colds once they start.
The pipeline from a modest finding to a confident health myth is short, well-worn, and easy to spot once you know the stations it passes through.
It is one of the most confidently repeated claims in parenting. It is also one of the most thoroughly tested, and the tests do not support it.
The famous rule is everywhere. A clear scientific basis for it is not.