The epidemic COVID-19 is the utmost dreadful disaster of current human life that led to public health's global health as a major health care issue. Patients of COVID-19 have the signs, for instance, fever, dry cough, dyspnoea, sore throat, nasal congestion, besides glassy lung opacities. The infection of COVID-19 has two immune protective and damaging phases, and physicians attempt to improve the patient immune reactions. Vitamin D has various ways of action to reduce infection risk and death and has beneficial effects on viral infections. Supplementation of vitamin D during infection conditions of COVID 19 is still controversial. Scientific investigations are required to define improved cut-offs for vitamin D levels and, finally, which quantity will be better as supplementations. Most of the works showed the people who are deficient in Vitamin D are more prone to infection. Broad familiarity with Vitamin D will make it supportive and protective for health. The present study focused on the worth of Vitamin D for the immune role, its presence in optimal amounts, and its effectiveness in COVID 19. Sun exposure synthesizes vitamin D in the human body, which ultimately enhances immunity, and protects from many viral infections, including COVID-19.