MuscleChemistry.com > Informational Forums > The Edge! > MC Discussion Topic: Clenbuterol
Check out this link. Its got some great info on clen.
ECA is Ephedrine + Caffeine + Aspirin. It works to burn body fat too, like clen. Some people prefer one over the other, I think it's just personal prefrence. A lot of people cycle them on and off so that their body doesnt get "too used" to one or the other.