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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.
While human and animal studies have shown that vitamin C does significantly improve immune function, over 40 years of research suggests that vitamin C does not prevent the common cold or decrease the severity of symptoms in non-athletic people. It may be helpful for highly active people training in stressful conditions. recent literature review concluded that vitamin C consumption may decrease the duration of cold symptoms, but does not prevent a cold or affect symptom severity. Claims of vitamin C's efficacy in treating the common cold have been criticized by many researchers.