As pointed out in a post last week by abew4me, (can't remember the post number), the mint flavored version of AnataBloc contains sucralose, which has reported side effects. May I suggest that if you were taking the mint version, sucralose might have been the problem, and not anatabine itself. Anyway, I have taken AnataBloc for over 2 years, which most of that is the unflavored, with no problems at all. Sorry you had a bad experience, and wish you well.