Editorial: Vitamin D and COVID-19 in older age: evidence versus expectations
British Journal of General Practice, January 2021
" Although recently updated meta-analytic evidence continues to suggest a modest protective effect against acute respiratory infections for a daily vitamin D dose equivalent of 400–1000 international units (IU) (odds ratio 0.70; 95% confidence interval = 0.55 to 0.89),13
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Reference 13 follows:
Vitamin D supplementation to prevent acute respiratory infections: systematic review and meta-analysis of aggregate data from randomised controlled trials
Nov 2020 preprint, not peer reviewed
David A Jolliffe et al
 Download the preprint PDF from Vitamin D Life
This preprint had so many errors that it was not included in Vitamin D Life
That it ignored with weight/age of the participants was just one of many problems
The editorial authors claim that there have been no trials completed - but there have been
COVID-19 treated by Vitamin D - studies, reports, videos
As of Jan 21 had: 34 trials, 4 trial results, 12 meta-analyses and reviews, 44 observations, 25 recommendations, 41 associations, 83 speculations, 36 videos see also COVID-19 and Vitamin D: Governments. Health problems. Hospitals
Many clinical trials are underway which are testing Vitamin D to fight COVID-19
The ones with shading have reported