COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D PXPX FLVFLV PVP-IPI BUBU BHBH BLBL CICI HC QHC Q NZNZ COCO More..
Vitamin D study #32 of 96
10/20 Pre-Exposure Prophylaxis study (treated before exposed to the virus)
Blanch-Rubió et al., Aging, doi:10.18632/aging.104117 (Peer Reviewed)
Influence of anti-osteoporosis treatments on the incidence of COVID-19 in patients with non-inflammatory rheumatic conditions
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Retrospective 2,102 rheumatology patients in Spain showing lower, but not statistically significant, cases with vitamin D supplementation. Details of vitamin D supplementation are not providied - other patients may have also independently taken vitamin D.

Blanch-Rubió et al., 10/20/2020, retrospective, Spain, Europe, peer-reviewed, 10 authors, dosage not specified.
risk of COVID-19 case, 8.0% lower, RR 0.92, p = 0.68, treatment 62 of 1303 (4.8%), control 47 of 799 (5.9%), adjusted per study.

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 96 studies
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