Excellent on-going analysis of Vitamin D and COVID-19 publications

https://c19vitamind.com/

Update: Vitamin D reduces COVID-19 by 80 percent - anonymous meta-analysis - Jan 5, 2021

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

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See also VitaminDWiki

COVID-19 treated by Vitamin D - studies, reports, videos

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