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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.
Preventing the Flu After Exposure. 1  Vitamin C: Although Vitamin C is widely used and has many benefits, there is no scientific proof that it will help you avoid an illness such as the flu or a cold. 2  Humidifiers: Evidence suggests that viruses such as the cold and flu spread more easily in cold, dry air.