This follows quite a lot of observational evidence. There are currently 11 studies that have found an association between serum vitamin D and Covid severity. Th

This follows quite a lot of observational evidence. There are currently 11 studies that have found an association between serum vitamin D and Covid severity. These are listed here: https://github.com/GShotwell/vitamin_d_covid https://github.com/GShotwell/vitamin_d_covid