The aim of this study was to evaluate the effects of vitamin D supplements on mortality and intubation rates in patients with CVD19. Patients with coronary heart disease who take enough vitamin D have a 52 percent lower risk of dying than people with vitamin D deficiency, according to a new study. Research has shown that lowering vitamin D3 levels increases the risk of death in patients with severe dementia.Vitamin D is a hormone produced by the skin when exposed to sunlight. The point to be made is that there are differences of opinion in the world about the side effects of vitamin D deficiency, but what is certain. According to experiments conducted in our country, we are facing a severe deficiency of vitamin D among the people, especially among postmenopausal women, and according to the results of research, most Iranians are deficient in vitamin D. The best way to increase immunity is to use natural foods to get vitamins and minerals.In the corona pandemic, the role of vitamin D in boosting immunity, getting COVID-19, hospitalization and mortality has always been debated.Cross-sectional studies on the role of vitamin D in reducing the incidence, hospitalization and even death of Covid-19 in different countries show a significant relationship between serum vitamin D levels and the severity of COVID-19 and mortality from the disease. This association is probably due to the effects of vitamin D on the immune response to this infection.The results of cross-sectional studies show that countries such as Spain and Italy, which have the highest rates of vitamin D deficiency, have the highest rates of COVID morbidity and mortality.In contrast, northern European countries, which had higher serum levels of vitamin D due to food fortification, also reported lower rates.

Vitamin D Supplements, Patient, Covid-19 Involved, Immune.