I got out like 630 stones on one of those flushes.I didnt throw up but felt ill for along time.I however did not do the morning salts so i may have had to many toxins floating around.I didnt feel normal until a week later but that was alot of stones to release in one flush and alot were at least pea size.I would have to say that the more oil you take the worse you are going to feel but it seems the results may be worth it.I think ill do 3/4 cup next time since i wasnt very happy with my last two 1/2 cup flushes.