Vitamin C and Common Cold
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Vitamin C and the common cold: Research results
To date, no conclusive data have shown that large doses of vitamin C prevent colds.
For people who take vitamin C every day, it may reduce the severity or duration of cold symptoms, but there is no clear evidence supporting this. Once symptoms of the common cold begin, taking vitamin C has not shown any benefit in reducing the severity or duration of cold symptoms.
Taking vitamin C for common cold prevention could provide some benefit for people exposed to brief episodes of intense exercise or extreme cold–weather environments.
Vitamin C and the common cold: Side effects
Taking vitamin C over long periods of time in large amounts may be harmful.
Too much vitamin C can cause severe diarrhea, a particular danger for elderly people and small children.