Official study results showed that those with Vitamin D deficiency were 14 times more likely to have severe or critical cases of COVID-19.

“There is a clear connection between a deficiency of vitamin D and COVID-19 mortality and severity, according to researchers from the Azrieli Faculty of Medicine of Bar-Ilan University.

The study, published on Thursday in the journal PLOS ONE, was one of the first to study the levels of vitamin D prior to the infection of COVID.”

https://www.jpost.com/health-and-wellness/coronavirus/article-695495