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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.
1. Sleep helps keep your immune system working like it should. Once you have a cold, you need to catch enough Zzz's to help your body fight off the virus. Take it extra easy during the first 3 days. Too little shut-eye can also make you more likely to get a cold. One study found that people who got less than 7 hours of sleep a night were nearly three times more likely to get sick than people who slept for 8 hours or more.