Some studies have shown that vitamin D supplements help fight respiratory infections, but some haven’t. A new study published in The BMJ clarified the confusion, and identified a group of people that might be better able to fight off colds and flu with vitamin D supplements.

The new research analyzed the results of 25 previous studies involving over 11,000 participants. The team behind the study, led by Adrian Martineau from Queen Mary University of London, organized the data according to participant blood levels of vitamin D and reanalyzed it.

They found that people deficient in vitamin D… more

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