A New Zealand study found that people who took large amounts of vitamin D per month still caught as many colds as those who were not taking these mega doses. And their colds lasted for just as long. This study is not totally conclusive and there are factors that may have affected the findings. For example, if the subjects' unknown immunity level was already high, the vitamin D would not have made much a difference in their immunity.
Still, Vitamin D is great for other things, such as maintaining healthy teeth and bones. Just don't bank on it to keep you from getting sick this year. Maybe Vitamin C would be a better bet.
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