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No, vitamin C does not help prevent colds. A meta-analysis[1] of 10,708 participants in various studies showed that the risk ratio of contracting a cold while on vitamin C prophylaxis was 0.97 for the general populace.
But the authors did find evidence that the vitamin could help prevent colds in people exposed to extreme physical exertion or cold weather. They found six studies in which the vitamin or a placebo was given to marathon runners, skiers and soldiers exposed to significant cold and/or physical stress.