Snapshot as of Dec 15. 2020
Treatment↓80% 42 Vitamin D studies. 33 peer reviewed
89% of studies report positive effects.
80% is the median improvement.
Sufficiency ↓53% 96% of studies report positive effects
Sufficiency (levels) studies analyze outcomes for vitamin D levels.
Confounding factors may be significant.
I have asked who is the owner of the excellent data analysis
COVID-19 treated by Vitamin D - studies, reports, videos
As of Jan 26 had: 34 trials, 4 trial results, 13 meta-analyses and reviews, 46 observations, 27 recommendations, 42 associations, 84 speculations, 38 videos see also COVID-19 and Vitamin D: Governments. Health problems. Hospitals