I also use several of those products, but it would be interesting to know how many people are using those things for Covid mitigation; I’ve never seen a survey on it. I am sure that the generally hostile reaction to self-managed preventative treatment has discouraged many people from doing it.
I agree that it would be interesting. I'm in a very liberal community and don't hear much of such things. Most of my vitamins and supplements are from online sources. There have been spot shortages in those, suggesting that other people are stocking up. Chain drug stores around us are low on cough/cold products and lots of other things too, but that's partly supply chain related.