Ephedrine and caffiene are the most important parts of the ECA stack. Asprine is only added for its blood thining properties. It is really the
ephedrine that is the key here because it downregulates the beta receptors which latch onto fat and make it such a bitch to get rid of. Caffiene and asprine are added in for energy and their syngeristic effects, in other words they help the
ephedrine work better. Another benefit is that this stuff gives you lots of energy, if your like me and hate cardio this stuff will get you in the mood. Plus it supresses appetite. It is worth mentioning that an ECA stack will raise your heartrate and constrict your arteries, thus increasing blood pressure, it isnt to dangerous but the FDA thinks that the American public needs a babysitter, just keep that in mind if you have a heart or blood pressure issues, probally better not to take it. But like Thick said, it is really no substitute for working out, the best way to burn fat is to increase lean muscle mass, it burns cals like a furnace.