CFS and Vitamin D

There are increasingly divergent views on the use of Vitamin D in CFS. On the one hand, recent high profile publications (Holick M, NEJM) demonstrating the association of many different diseases including CFS with low serum vitamin D levels has provoked a sea change in the recommendation of Vitamin D supplementation with very aggressive supplementation being advocated and the normal range has been suddenly increased two-fold or more by commercial laboratories which is very suspect. Whether this association can in fact be linked to the ability to reverse or prevent such a large array of diseases by simply increasing Vitamin D intake is open for debate. On the other side of the debate are some observations by a minority of investigators that suggest that Vitamin D can worsen CFS and even advocate the elimination of Vitamin D from dietary supplementation and the reduction of sunlight exposure to further reduce Vitamin D.

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