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Association between vitamin D supplementation and COVID-19 infection and mortality (12th November 2022) Johns Hopkins University of Michigan National Bureau of Economic Research Department of Medicine, University of Chicago Department of Veterans Health Affairs Department of Medicine, University of Chicago, Chicago Vitamin D deficiency, associated with reduced immune function, can lead to viral infection Vitamin D deficiency, associated, increases the risk of COVID-19 But is it a treatment / prognosis improver? Population of US veterans, we show that Vitamin D2 and D3 fills Associated with reductions in COVID-19 infection After applying all restrictions 220,265 supplemented with vitamin D3 34,710 supplemented with vitamin D2 407,860 untreated patients. Study design Retrospective cohort Supplemented (before and during the pandemic),