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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.
Vitamin C and colds. Despite the popular belief that vitamin C can cure the common cold, research about this claim is conflicting. Large doses of vitamin C may help reduce how long a cold lasts, but they do not appear to protect against getting a cold. This is true even after being exposed to the virus that causes colds. Taking a vitamin C supplement may help treat a cold only if your body currently has low levels of this vitamin.