Essential amino acids (EAA) are 9 amino acids that the human body cannot produce or synthesize on its own, they must be taken from the diet. There are also relatively essential amino acids that can be produced in sufficient quantities most of the time, with the exception of, for example, extreme catabolic distress, and non-essential amino acids that your body can produce. The branched chain amino acids (or BCAAs) are actually 3 of the 9 essential amino acids: Leucine, Isoleucine, and Valine. These are the amino acids that are most responsible for initiating protein synthesis, which is the main mechanism of action behind the many benefits of BCAA supplementation. When you use the BCAA, you receive these 3 specific EAAs. When you use the EAA, you get all 9 of them. The EDA provides a small safety net so you can take full advantage of the add-ons. Both will work, the results are sure if you use them properly and combine them with the right diet and exercise program.