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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.
Scientists do agree that the regular intake of moderate doses of vitamin C (equal to about 200 mg per day) can lessen the severity and shorten the duration of the common cold. However, they also agree that vitamin C does not generally lower the likelihood of being infected by the cold virus.