COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D HC QHC Q Vitamin CV.C ZincZn PXPX BHBH FPVFPV FLVFLV PVP-IPI CICI BLBL RDRD
Vitamin D study #76 of 89
2/24 Pre-Exposure Prophylaxis study (treated before exposed to the virus)
Sulli et al., Nutrients, doi:10.3390/nu13030717 (Peer Reviewed)
Vitamin D and Lung Outcomes in Elderly COVID-19 Patients
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Retrospective 65 elderly COVID-19 patients and 65 matched controls, showing lower vitamin D levels associated with more severe lung involvement, longer disease duration, and higher mortality. Vitamin D supplementation was less common in the COVID-19 group compared to the control group.

Sulli et al., 2/24/2021, retrospective, Italy, Europe, peer-reviewed, 10 authors, dosage not specified.
risk of COVID-19 case, 50.4% lower, RR 0.50, p < 0.001, treatment 22 of 66 (33.3%), control 43 of 64 (67.2%), vitamin D supplementation.

Effect extraction follows pre-specified rules prioritizing more serious outcomes. For an individual study the most serious outcome may have a smaller number of events and lower statistical signficance, however this provides the strongest evidence for the most serious outcomes when combining the results of many trials.
Details of all 89 studies
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