Performance, Muscle Gain and Recovery The key to success for any active person, from novice to professional, is the ability to recover post training. Supplementation with the proper ratio of BCAA's may greatly enhance the body's ability to recover. BCAA Stack contains Leucine, Isoleucine and Valine with added glutamine; this is a powerful balance of Branched Chain Amino Acids (BCAA) which are the building blocks of lean muscle. Their branched chemical structure is essential in that the body cannot make them from other compounds. These 4 amino acids have proved to be the biggest contributors to muscle gain, energy production and muscle recovery.