The ECA stack combines ephedrine, caffeine, and aspirin in a predetermined ratio. It causes your body to target specific fat cells to be burned for energy, all while raising your overall metabolic rate and supressing appetite.
Ephedrine and caffeine work together synergistically. When stacked, the combined effects of Ephedrine, Caffeine and aspirin are far greater than the sum of their effects when used individually.
This is a great fat burning combo.