I know it sounds biased, but the truth is I have tried many many OTC fat burners on the market, and have been disappointed with about 80% of them. Do not get me wrong, not all of them are garbage however you can spend a lot of money on supplements trying to find something that actually works. Some people cannot stand Clenbuterol becauseof the shaky hands or just makes them feel bad. Only thing I notice when I am using Clenbuterol is a clinching of the jaw.