There are lots of studies suggesting positive effects of vitamin D on Covid. It’s early so it’s not established fact that this is the case. But vitamin D has positive effects anyway. Perhaps you could direct us all to some studies that suggests taking recommended doses will lead to the problems you have listed.
Oi! He's my stalker. Go and get one of your own.
Richard Taylor
"William Tell could take an apple off your head. Taylor could take out a processed pea."
Sid Waddell