I just started taking this yesterday. I read the review about the proper way to take it (with food and a ton of water) and am sticking to that and haven't had any negative side effects mentioned in the other reviews. I took it once in the morning and once at night and again this morning. The first 2 pills made me feel really warm almost immediately. I was expecting this a little but it was more than I was expecting. I feel ok though after taking the one this morning. I'm hopeful that it'll help rev my metabolism and help me break this plateau for additional weight loss but it's too early to tell yet.