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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 zinc probably don't keep colds at bay. When threatened with a cold, Tallman says, people reach for the vitamin C or zinc. While some studies suggest these supplements might help shorten cold symptoms, others show they don't.