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Vitamin D study #39 of 96
11/2 Pre-Exposure Prophylaxis study (treated before exposed to the virus)
Annweiler et al., Nutrients, doi:10.3390/nu12113377 (Peer Reviewed)
Vitamin D Supplementation Associated to Better Survival in Hospitalized Frail Elderly COVID-19 Patients: The GERIA-COVID Quasi-Experimental Study
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Retrospective study finding that regular bolus vitamin D supplementation was associated with less severe COVID-19 and better survival in frail elderly.
For those receiving regular supplementation:
Adjusted mortality hazard ratio with supplementation HR 0.07, p = 0.017.
Risk of severe COVID-19 with supplementation OR 0.08, p = 0.033.
For supplementation started after COVID-19 diagnosis:
Adjusted mortality hazard ratio HR 0.37, p = 0.28.
Risk of severe COVID-19 with supplementation OR 0.46, p = 0.4.

Annweiler et al., 11/2/2020, retrospective, France, Europe, peer-reviewed, 7 authors, dosage 50,000IU monthly, dose varies - 50,000 IU/month, or 80,000IU/100,000IU every 2–3 months.
risk of death, 93.0% lower, RR 0.07, p = 0.02, treatment 2 of 29 (6.9%), control 10 of 32 (31.2%), adjusted per study, regular bolus 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 96 studies
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