Ok, I got it wrong. Started typing in, but when I got so far, the suggestions came up, and I clicked one. Turned out to be hydroxyquinaline. Now Ive found hydroxycloroquine, its simply simmering grapefruit and lemon peel. Most of the results claim thst this is a man made compound that cant be made at home, as the ingredients do not contsin enough quinine. Others claim that this claim is made by our old mate, big farmer, that they simply add fillers and preservatives. This doesnt sound impossible. So, Ill give it a go. My knees hurt, most likely arthritis. Ifs the cough and sniffle season, so being natural, it csnt do any harm. Ill tske it with a zinc tablet.