This is not a study, but it does discuss the biochemistry of vitamin D and the role it plays in the immune system. It is left to the viewer to draw their own co

This is not a study, but it does discuss the biochemistry of vitamin D and the role it plays in the immune system. It is left to the viewer to draw their own conclusions. COVID-19 and Vitamin D | Association Between Vitamin D Deficiency and COVID-19 https://www.youtube.com/watch?v=cT1CaTv5-e4 https://www.youtube.com/watch?v=cT1CaTv5-e4