Thanks for the advice. I take it from your comments that unlike hydroxychloroquine and ivermectin, which you have to buy on the black market, quercetin seems to be readily available.
btw, Dr Zalenko has a record of successfully treating hundreds/thousands with his "Z-pack".
You can purchase direct with all ingrediants in one capsule or simply the ingredients/vitamins individually...which is what I've done.

RE: U take it from your comments that unlike hydroxychloroquine and ivermectin, which you have to buy on the black market, quercetin seems to be readily available.
Absolutely. I buy mine from The Vitamin Shoppe. It is headquartered in New Jersey and has nearly 800 franchise locations nationwide.
See here:
https://www.vitaminshoppe.com/
But there are many more competing Vitamin stores all over the country. You should be able to get Quercetin from them. Competition is good. It makes the price affordable.