As a biochemist, I’ve known about vitamins D,E,C and now K2 as being important in providing immune response. My wife and I have been taking Vitamin D 1000IU/day throughout the pandemic and so far have not got Covid even everyone around us has had it.
Lots more evidence at
https://vitamindwiki.com/tiki-index.php?page_id=11728
See also vitamin D at https://hlahore.substack.com
As a biochemist, I’ve known about vitamins D,E,C and now K2 as being important in providing immune response. My wife and I have been taking Vitamin D 1000IU/day throughout the pandemic and so far have not got Covid even everyone around us has had it.