I don’t know why more people aren’t picking up on the vitamin d connection, or why public health people aren’t recommending supplementation, or at least having doctors screen people for deficiency who are in for visits anyway. We have known for years we have an epidemic of low vitamin d levels, especially in poorer and minority populations- which are the populations hardest hit by covid (for a myriad of reasons, but I think vitamin d is one of them).
Vitamin d is readily available and it is way easier to take a vitamin every morning than go around with a mask all day or skip Thanksgiving with relatives. Suggesting a supplement doesn’t cause ‘personal freedom’ issues or start fights with store managers in Costco or make police chiefs come out against their own governors, you either take the vitamin or you don’t and no one else knows.
I am not suggesting that vitamin d should take the place of masks or distancing, just that there seems to be better evidence for its effectiveness (compared to masks) and less controversy around the implementation, but we are focusing all our efforts on the hardest things to implement. Why not pick off some low-hanging fruit?