From a research study, Based on the antiviral and anticoagulant effects of Vit D, as well as its convenience and safety, we hypothesize that a single dose of 300,000 IU of Vit D can be helpful for the treatment or prevention of COVID-19 (Figure 1). It is very necessary to add Vit D to the ongoing treatment trials, especially in the case that no specific medications are available for the treatment of COVID-19. I personally took 300,000 units. I did not die. My husband took 300,000 units. He did not even get sick, but had Covid.