The BCAA are made up of three essential amino acid, leucine, isoleucine, and valine. They are essential because the body is unable to make them out of other amino acids, meaning they must be ingested through food or supplements. The BCAAs make up 40 percent of the daily requirement of all nine essential amino acids, indicating their importance.
As their name suggests, BCAA has a branched side chain that simplifies the job of converting each amino acid into energy during intense exertion. They make up about 35 percent of all muscle tissue. The more BCAAs are present in the muscles, the more they will be used for energy, slowing the breakdown of muscles cells and preventing muscle loss.