Yes I had stomache discomfort from beast and vomited twice in the first couple days. If you take the powder out the capsule and pour it in a drink it doesnt mess with your stomach. I would do this then eat a small meal and no more stomach issues for me. That is my only complaint about beast. Other than that it works great.
Me, the wife and mother in law got the stomach flu when I took my first cycle of beast. I don't know if someone was sick when they mixed it but I've had the same thing. It sucked!
I think one day I was so sick when it first hit I didn't take anything then the next I took one maybe two I can't remember but it will pass. Just ride it out.