No idea. And in general I don't know that it's a great idea to just take stuff routinely, because very very few things only affect one thing in your body and whatever you take in has to get along with all the parts. Quercetin, for example, is anti-inflammatory all over. I'm practically a hermit and take one if I go somewhere around people, but then I discovered it would open up my ears after they were plugged for weeks and nothing else worked.

There is quite a lot of information about quercetin. For a start, https://pubmed.ncbi.nlm.nih.gov/33034398/ Plenty more in sidebar links.

This article is interesting: Repurposing Ayurvedic medicinal plants against SARS 2. https://pubmed.ncbi.nlm.nih.gov/33561649/
Besides quercetin, gingerol and curcurmin are moderately effective separately, maybe better together because they all target different parts of the virus. Eat more ginger and cucumber. It is also good to consider all chemical intake against your body's ability to metabolize and excrete it. This is why the drug ads on TV always add "tell your doctor if you have hepatitis-kidney failure-on dialysis" etc. That wonder drug might clear up psoriasis and be the last straw for your liver. So I would not blindly recommend any doses, I would take what info looked relevant, printed out and official looking, to my doctor and ask him if it would pose any interaction problem. But I have a cool doctor who would actually research it.