Anecdotally, since taking vitamin D3 supplements I haven't been getting colds. Added daily nutritional zinc supplements in 2020 as soon as they were available a

Anecdotally, since taking vitamin D3 supplements I haven't been getting colds. Added daily nutritional zinc supplements in 2020 as soon as they were available after I heard the anecdotal evidence D & zinc are effective in Covid prevention. Throughout winter and early spring last year you couldn't get zinc supplements for love or money. A lot of anecdotes there :). The American medical establishment has a long history of not getting behind nutritional disease prevention. Some of it is for good reason, but I think there is also a systemic bias.