Several studies evaluating vitamin D in relation to COVID-19 have given conflicting results, and further research is needed to verify the connection.
A report in the science journal Lancet states that epidemiological studies investigating links between Vitamin D and incidence and severity of COVID-19 are currently limited in number. Two ecological studies reported inverse correlations between national estimates of vitamin D status and COVID-19 incidence and mortality in European countries. Lower circulating Vitamin D concentrations have also been reported to associate with susceptibility to SARS-CoV-2 infection and COVID-19 severity.
Moreover, prospective studies can provide insights into the potential for reverse causality. Still, results from those published to date are conflicting. One retrospective longitudinal study from Israel reported independent associations between low pre-pandemic 25(OH)D levels and subsequent incidence and severity of COVID-19. Still, a study in the UK showed no such associations.
Several clinical trials and research studies are underway to understanding the connection between Vitamin D and Sars-Cov-2 but they have not publicly posted the results of their findings yet.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.