"fat burners" - the name makes them sound so simple and effective, but the truth is they are very potent drugs put together, and there's a chance your body doesn't respond well to one as it does to another.
These drugs will be changing the chemical composition of your body to get the job done ( high levels of caffiene, etc.), so I would stick to the ones that most people suggest, and I would not get too pissed off if it doesn't burn fat right off of you, cuz sometimes it doesn't