Vitamin D is well known to be essential, but most people do not get enough. Evidence to date suggests the possibility that the COVID-19 pandemic sustains itself in large part through infection of those with low vitamin D, and that deaths are concentrated largely in those with deficiency.

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A comprehensive update of immunological mechanisms underlying positive effects of Vitamin D in reducing SARSCoV2 infection, and a thorough survey of recent epidemiological studies and clinical trials

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