WHO declared COVID-19 a worldwide pandemic. The ambitions of this paper are to assess if there is any affiliation between mean levels of diet D in various countries and cases respectively mortality because of COVID-19. Low vitamin D repute in winter allows viral epidemics. During iciness, those who do not take Vitamin D supplements are possibly to have low serum 25-hydroxyvitamin D [25 (OH) D](25-hydroxyvitamin D) concentrations. Vitamin D can reduce the chance of viral epidemics and pandemics in numerous approaches. First, better 25 (OH) D concentrations lessen the chance of many continual illnesses, together with cancers, cardiovascular sickness, continual respiratory tract infections (RTIs), diabetes mellitus, and high blood pressure. Patients with continual sicknesses have a drastically higher threat of dying from RTIs than otherwise wholesome human beings. 2d, Vitamin D reduces the risk of rites thru three mechanisms: Keeping tight junctions, killing enveloped viruses through induction of cathelicidin and defenses, and reducing the production of pro-inflammatory cytokines by means of the innate immune machine, thereby decreasing the hazard of a cytokine hurricane leading to pneumonia. Observational and supplementation trials have pronounced higher 25 (OH) D concentrations associated with decreased threat of dengue, hepatitis, herpes virus, hepatitis b, and c viruses, human immunodeficiency virus, influenza, breathing syncytial virus infections, and pneumonia. Effects of a community discipline trial pronounced herein indicated that 25 (OH) D concentrations above 50 ng/ml (125 nmol/l) vs.< 20 ng/ml have been associated with a 27% discount in influenza-like ailments. From the available evidence, we hypothesize those raising serum 25 (Oh) D concentrations through Vitamin D supplementation may want to lessen the occurrence, severity, and chance of dying from influenza, pneumonia, and the cutting-edge COVID-19 epidemic.