I started taking this because I am cycling off a thermogenic with caffeine, but trying to avoid the weight gain I had when I cycled off before. This product is great!! I haven't gained back any weight and I like the fact that I can drink coffee now since I don't like going overboard with caffeine and avoided extra caffeine while on the other thermogenic. It has given me some extra energy and I all around live the fact there are no side effects, other than losing fat!!! I feel like I sweat a lot more during high intensity training. If I was more strict with my diet, I'd probably be loosing more weight, but I'd rather loose the weight slower and enjoy my occasional glass of wine and tasting of deserts!