TweetVery good question! I have seen the results of studies with EC vs ECA and most studies showed that the ECA stack was more effective. I still don't understand why or has anyone been able to effectivly explain even in theory why it would work better. You are yousing the EC because it stimulates beta receptors and is Thermogenic so why would you include a compound the reduces body temperature? Never quite understood it but you will see in every major diet drug white willow bark (used to make asprin).