I use generic Chinese stuff, fairly cheap, but the stuff is strong. I was using 4ius ed, hands hurt form several months, knuckels would swell, would go numb, cut back to 2iu ed and starting to add 2iu's eod to keep weight loss and gains to a maximum. I have read many threads, everybody has basicly the same sides, but no body as posted that they had sides as bad as mine. Shit is strong IMO...