I did all of those things on Zelenko’s chart and still got a bad case of Fauci Flu.
I have been taking what’s listed there for years. I’m 58. I got covid. I had no symptoms except that I lost my sense of taste and smell. So obviously I would suggest that people also take what’s listed in your post. Quercetin is in a lot of foods. Look it up and you can get it just by eating the right foods.
I take those three every day, just like that anyway. I have wrestled with low d3 for years.