ECA is a stack of Ephedrine Caffeine Asprin. It is available in a number of brand names which contain these three ingredients and possibly a couple others. You typically take this supplement a little bit before your workout and one or two other times during the day but before a meal. It depends on the product. This ECA will give you a lot of energy (depends on person) and helps burn fat as well. It is also a mild appetite suppressant for me and others. Other than that, just make sure you don't have high blood pressure or anything and then buy a product such as Xenadrine and follow the directions on the bottle--starting off with 1/2 the dosage. good luck