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Cold remedies: What works, what doesn't, what can't hurt

Vitamin C

Taking vitamin C has not been shown to help prevent colds.

But some studies have found that taking vitamin C before cold symptoms start may shorten how long symptoms last. Vitamin C may help people at high risk of colds because they're often in contact with the viruses that cause colds. For instance, children who go to group child care during the winter are at high risk.