Relation of vitamin D to COVID-19

•Vitamin D, an immunomodulatory substance.•SARS-CoV-2, leads to the development of respiratory distress, sometimes leading to fatalities.•Vitamin D deficiency is associated with SARS-COV-2. The coronavirus pandemic has lasted for more than a year now and still remains the leading cause of concern, worldwide. The causal agent; SARS- CoV-2, leads to the development of respiratory distress in the lower respiratory tract, sometimes leading to fatalities. Keeping in mind the discovery of mutant strains across the world, as well as the delay in vaccinations across vast populations, most people speculate boosting their immune systems as a preventive and precautionary measure. One of the most commonly observed conditions that hamper immunity; Vitamin D deficiency has been linked to the onset and the alteration of course of the disease in patients and is also being explored as a potential drug supplement. These surmises make it essential to study deep into the speculations. This review aims to overview the possible correlations between Vitamin D and COVID-19.