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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.
Try zinc tablets. Zinc, which helps boost the immune system, can help shorten the duration of the common cold by up to 40 percent, according to a study published in the Open Respiratory Medicine Journal. Zinc lozenges are easiest to use while you have a cold, and are available at most drugstores.