

It does that by blunting the activity of a substance that blocks the activation of the Mammalian Target of Rapamycin or mTOR. One of the BCAA, leucine, is considered the primary "trigger" for initiating MPS. Of all the essential amino acids (EAA) the BCAA are the ones most involved in muscle building and maintenance. Indeed, 35% of the amino acids found in muscle are BCAA. They are often termed "muscle amino acids" because unlike other amino acids, the metabolism of the BCAA largely occurs in muscle. The BCAA consist of three essential amino acids: leucine, isoleucine, and valine. But from a bodybuilding perspective, the most controversial and popular amino acids are easily the branched-chain amino acids (BCAA). Examples include arginine, glutamine, and taurine. Some amino acids are termed "conditionally essential" because the body cannot produce them in sufficient amounts under certain conditions, such as high stress.
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In terms of building muscle, only the nine essential amino acids are required and they must all be present at the same time for the full expression of muscle protein synthesis (MPS), the cornerstone of muscular hypertrophy or growth.


The other amino acids are called "non-essential" because they can be synthesized in the body from other amino acids. What that means is that these particular amino acids cannot be synthesized in the body, but must be ingested from food sources. The body uses 22 of these amino acids, but only nine are deemed essential. While it's no secret that you need to ingest protein to help develop larger muscles, what is really needed are the elemental building blocks of protein known as amino acids.
