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1 However, taking vitamin C before the onset of cold symptoms may shorten the duration of symptoms. 2  Vitamin C may provide benefit for people at high risk of colds due to frequent exposure â for example, children who attend group child care during the winter.
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.