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NIH to recommend Vit. D supp?


Vitamin D has a history of large scale studies pointing both to and away from health benefits, and many western countries already recommend supplementing Vitamin D during winter months. An extensive summary of the evidence for Vitamin D’s various claimed health effects can be found here.

Recently, some evidence has emerged which suggests that Vitamin D may have a protective effect against coronavirus. As Vitamin D supplementation is widely regarded as very safe, and Vitamin D pills are cheap, this has led many people to start taking Vitamin D as a preventative measure. A summary of the case for the protective effect of Vitamin D against Coronavirus is available here. More discussion is available here.

This question asks:

Will the US NIH recommend Vitamin D supplementation as a protective measure against coronavirus before the end of the pandemic?

This question resolves positively if, before the end of the coronavirus pandemic, official guidance from the United States National Institute of Health states:

  • That healthy adults should be regularly taking a Vitamin D supplement.


  • That a benefit of such supplementation is the likely protective effect of Vitamin D against coronavirus.

The CDC already recommends Vitamin D supplementation in healthy people. This is not sufficient for resolution as the NIH states

The role of vitamin D supplementation in the prevention or treatment of COVID-19 is not known. The rationale for using vitamin D is based largely on immunomodulatory effects that could potentially protect against COVID-19 infection or decrease the severity of illness. Ongoing observational studies are evaluating the role of vitamin D in preventing and treating COVID-19.

The end of the coronavirus pandemic is considered to be the end of the first week in which total global daily deaths from coronavirus are below 250.

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