Tip of the hat to ex-redditor. It's an over the counter, no prescription item. I've read in other places using it with zinc and antibiotic is a therapeutic for the coof. Pretty sure the Dr. Zelenko protocol uses it and he talked about it in a video posted here. Can't recall if I posted it or someone else did. Updated: here's a link to another post with the details in the article comment. https://poal.co/s/QStorm/424207 Dr. Zelenko recommends:  500mg/day of Quercetin 95%  30mg/day of Zinc (from 130mg Zinc Sulfate)  800-1,000mg/day of Vitamin C (as Ascorbic Acid)  5,000 IU / 125mcg of Vitamin D3 (as Cholecaclciferol)