Correct me if I'm wrong, but recipes like this aren't Hydroxychloroquine... more of a homemade version of Quercetin. Quinine is derived from the bark of a very specific tree, that grows in South America (Cinchona officinalis.) Chemical synthesis is not easily achieved, let alone by just dumping stuff in a pot and boiling the heck out of it. Citric Acid, found in citrus fruits, interact with metal readily, and often strip traces of those metals found in pots and pans into the substrate you are rendering or extracting. Anyone with basic canning skills knows this. Be very cautious about who you listen to about home made cures.