BCAA Stack contains 6 grams of Leucine overload ratio of Branched Chain Amino Acids, as well as 2.5 grams of L-Glutamine per serving. While all BCAAs play an important role in muscle, it is Leucine that has been shown to play the most critical role in stimulating muscle protein synthesis through multiple mechanisms of action, including mTOR and P13K stimulation (protein synthesis regulators). Leucine has been shown to increase glucose and amino acids uptake in muscle and is often regarded as the single most powerful muscle synthesizing amino acid. Glutamine has been shown to have a regulatory role in whole body protein synthesis as its levels inside muscle govern protein synthesis and nitrogen balance and therefore muscle building. Research shows that when adequate amounts of glutamine is ingested, the body increases the rate of protein synthesis, speeds recovery time and increases the rate at which lean body mass is gained.