Using 20.000 to 50.000 ui Vitamin D every second day oral, it will help up 50% for don't get the virus. Also if you can use Medivitan injection one itme a week.
U guess also 2-4 ui day of hgh also not so bad (it will help to build your body system too).
I had several clients with the same problem, in Europe's online pharmacies sell one medicine whit name KANOFER (КАНОФЕР), this is a Russian product who helped them very quickly in their recovery.