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Will Boosting Your Vitamin D Levels Help Prevent Colds or Not?

Story at-a-glance -

  • According to a new JAMA study, vitamin D supplements appear to be useless for reducing the number or severity of colds or upper respiratory tract infections
  • Participants receiving once-monthly mega doses of 200,000 IU’s of vitamin D3 for two months, followed by 16 once-monthly doses of 100,000 IU’s experienced only a 10 percent reduction in colds and upper respiratory infections during the study period compared to the control group
  • The disappointing results may be explained by the fact that the control group had higher than normal vitamin D levels attributed to sun exposure. Numerous other studies have confirmed vitamin D’s ability to reduce colds and URI’s, but the control group is typically severely deficient in most studies
  • One massive dose once a month is unlikely to help you maintain robust immune protection long-term. Additionally, mounting evidence now suggests that elevating your vitamin D level with an oral supplement is unlikely to provide you with the identical health benefits as getting your vitamin D from sun exposure

By Dr. Mercola

For the last ten years, I've regularly reported on the benefits of vitamin D, especially for combating colds and flu. But according to a new study in the Journal of the American Medical Association (JAMA), vitamin D supplements appear to be useless for reducing the number or severity of colds or upper respiratory infections.

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