protect against viral respiratory infections and play a regulatory role in the body’s immune response. This has led to a proposal that taking vitamin D supplements could help prevent or even treat COVID-19, the primarily respiratory disease caused by the virus SARS-CoV-2.Stay informed with live updates on the current COVID-19 outbreak and visit our coronavirus hub for more advice on prevention and treatment.While no clinical trials have tested the vitamin’s efficacy as a treatment or a preventive measure, several studies have found an association between low levels of vitamin D and COVID-19.