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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.
How much vitamin C should be taken to fight off a cold? For normal, healthy adults, the daily recommended amount is 75 mg for women and 90 mg for men. For young children up to 3 years of age, the recommended amount is 15 mg per day and is 25 mg per day for children between the ages of 4 and 8.