You can buy Quercetin at a health store. Over the counter. Quercetin has been recommended from many different sources. I feel that it may not be as effective as hydroxy or ivermectin but something is better than nothing ~ right? Better get in quick before they ban that too!! (vitamin d has doubled in price and vitamin c gone up too - only because they are in such high demand. They are also talking about making vitamin D prescription only!! (New Zealand). )