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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.
A low WBC can exist without outside symptoms, however. Natural Ways to Boost WBC. Though there are medications available to increase WBC that may be necessary in severe cases, there are also a number of natural methods you can use. They include the following. 1  Take zinc. 2  You probably already know that zinc is helpful when you first feel the symptoms of a cold coming on.