Aspirin inhibits prostaglandin production outside of the cells, which, in conjunction with caffeine, greatly prolongs the thermogenic effects and increased metabolism by substaining elevated cAMP levels.
http://en.wikipedia.org/wiki/ECA_stacki always use aspirin when i take ephedrine/caffiene...just use the childrens dosage of 81 mg.
also...i always add in some green tea extract, l-carnitine, and yohimbe hcl. ...the green tea extends and amplifies the eca stack, the l-carnitine SUPPOSEDLY helps you burn fat more effeciently(im not sure...but i have a few bottles so why not use it?), and the yohimbe helps increase blood flow to the "stubborn areas" of fat, and also ramps up your thyroidjust a bit.