What the research says: People who take 200 mg of the vitamin every day might have slightly shorter colds than other people according to a 2013 review of 29 trials. But loading up after symptoms doesn’t seem to help at all.
Is it safe? The pills make kidney stones more likely, and high doses can cause nausea and diarrhea. They may also interact with cancer drugs, blood thinners, and estrogen.
CR’s take: A better bet: Regularly include vitamin C-rich foods, such as greens and citrus fruits, in your diet.
Source: Consumer Reports magazine January 2018
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