BK, listen to this. Clen is a potent substance, but T3 is a whole different set of problems if you F up your natty levels or do this wrong. Im definately no expert having never used it, but if you read up on it you will find that as a master hormone in your body, its not something to be tamperred with unless you have incredible amounts of knowledge on it. I know a lot of people disagree with me, but its some serious shite.