its a gnc brand product. the guy at the store says it works like hydroxycut hardcore...which is a good and bad. hydroxycut did work for me but they no longer sell it. i just started taking amplified muscle igniter. it gives me more energy during work out. i worked out 2 1/2 hrs yesterday. i felt like i could have worked out longer. normally i would work out 1 1/2 hrs. i'm just wondering if it burns calories like it claims. the box says 300% more calorie burn. it looks kinda like hydroxycut hardcore packaging....kinda scary. any one tried?