QWISO reqiures a more rigorous purging, but in the levels that may remain, are far below safe levels. No, you don't want to drink tincture made with ISO... although it is actually only twice as poisonous as grain alcohol........... Most people only use QWET for tincture as if you use it for quick effect with drops under the tongue, Everclear tastes much better anyway...lol
I put it in coffee, and sometimes in icecream lol!