What are the performance differences between ECA and Clen. I have tried ECA before, and it worked well, but I am looking for something more. Does Clen have the same withdrawl that ECA has? With ECA I could take it in the morning and be able to sleep at night, with Clen will I be wired for days straight? Also with ECA I noticed it was hard to gain muscle while on it. Does clen have any anti catabolic qualities to it? Also is there any particular brand / place to buy anyone recommends? I am looking to shed fat while continuing to increase lean muscle.