”We found a significant direct association between vitamin D deficiency and elevated risk of COVID-19 in-hospital mortality. Moreover, each unit increment in serum vitamin D levels was associated to significant reduction in risk of COVID-19 mortality.”
Ebrahimzadeh A, Mohseni S, Narimani B, Ebrahimzadeh A, Kazemi S, Keshavarz F, Yaghoubi MJ, Milajerdi A. Association between vitamin D status and risk of covid-19 in-hospital mortality: A systematic review and meta-analysis of observational studies. Crit Rev Food Sci Nutr. 2021 Dec 9:1-11. doi: 10.1080/10408398.2021.2012419. Epub ahead of print. PMID: 34882024.