Branched chain amino acids provide safe nutritional support for athletes and individuals seeking optimal lean muscle mass. The three branched chain amino acids, leucine, isoleucine and valine, boost energy while helping to counteract muscle protein breakdown during exercise. In addition, the ingredients in this product promote the biosynthesis of other amino acids, nucleotides, and biological amines. Branched chain amino acids are unique in that they are not metabolized by the liver.