Just got it today and used it for first time. I also felt a lil nauseous and had a lil stomach irritation,.. but i think it had more do to the fact that I had an upset stomach all day,... and couldnt get to mix right with water, resulting in me drinking like 3 glasses of water just to get all the leftovers,... i will try try juice next time. But i'll tell you what,..... when it kicked in,...... i was on cloud 9. Im currently doing DC training, so the high rep work sets at the end of the exercises take it out of me. Today, i hit the work sets, and moved on like they were simply nothin,...... all in all, great stuff.