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@hippy
A 2010 Cochrane Review concluded:[7]
The failure of vitamin C supplementation to reduce the incidence of colds in the general population indicates that routine prophylaxis is not justified. Vitamin C could be useful for people exposed to brief periods of severe physical exercise. While the prophylaxis trials have consistently shown that vitamin C reduces the duration and alleviates the symptoms of colds, this was not replicated in the few therapeutic trials that have been carried out.
http://en.wikipedia.org/wiki/Vitamin_C_megadosage#Common_cold