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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.
Taking a vitamin C supplement may help treat a cold only if your body currently has low levels of this vitamin. For example, people who live in cold climates may have low levels of vitamin C, so taking a vitamin C supplement may help keep this group of people from getting colds.