The relation of vitamin D deficiency and COVID-19

Background. Given the role of vitamin D in many parts of the immune response; inverse relationship between its level in the population and morbidity for acute respiratory diseases and, in particular, for COVID‑19; meta-analysis data on the effectiveness of vitamin D supplements in the prevention of acute respiratory diseases; high rates of vitamin D deficiency in some areas, it may be recommended to use supplements of this vitamin for prevention of SARS-CoV-2 infection and severe COVID-19, although additional randomized clinical trials and meta-analyses are needed.