Pure Ephedrine is a sympathomimetic substance, which is commonly used as a stimulant, appetite suppressant, concentration aid, decongestant and fat burner. Its because of these effects that makes it so popular.

Caffeine is known medically as trimethylxanthine, and the chemical formula is C8H10N4O2. When isolated in pure form, caffeine is a white crystalline powder that tastes very bitter. It is used to provide a "boost of energy" or a feeling of heightened alertness.

ECA Stacks are usually made up of Ephedrine, Caffeine and Aspirin. Sometimes Naringin or Tyrosine can be added. These products are combined in a synergistic ratio to boost fat burning and enhance gym and work-out performance.

Fat Burners are products which enhance the process of losing weight, usually by thermogenesis or boosts to the metabolism. A side effect of fat burners is their energy boosting properties which is also beneficial to weight loss.