COVID-19 risk reduction by early treatment: 5X Vitamin D
Latest is at: https://c19early.com/#fpearly
Early treatment: subset of table: cost <$20 with >3 trials

Random effects meta-analysis of early treatment studies (pooled effects). Treatments with ≤3 studies or <25 control events are shown in grey. Pooled results across all outcomes are affected by the distribution of outcomes tested, please see detail pages for specific outcome analysis.
Note:
Suspect this is for early hospital treatment.
Vitamin D reduces COVID-19 even more when taken at first sign of symptoms
Suspect this includes both over-the-counter Vitamin D and Calcidiol (Calcifediol)
Curcumin, Quercetin, Zinc (as well as 7 others) activate the risk of dying of COVID-19 by #F00:30X

Zinc (which increases vitamin D in tissues) may both prevent and treat COVID-19
Quercetin and Vitamin D - Allies Against COVID-19
Ivermectin and COVID-19 - many studies includes the following comparision
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Note: Ivermectin raises Vitamin D levels
Review of Early Treatments of COVID-19 (within a few days of symptoms)
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