Amino acids are the building blocks for all proteins, making them essential for a number of body functions, including fluid balance, enzyme production, cellular repair and energy metabolism. Amino acids also provide a readily available form of nitrogen, a critical element that forms various compounds such as neurotransmitters and creatine. In humans, protein is composed of 20 amino acids, only some of which the body is able to produce. Those that need to be obtained from exogenous sources are referred to as the essential amino acids. Pure Encapsulations Essential Aminos formula is based on the ratios of essential amino acids from high biological value (BV) protein sources. Proper intake of these amino acids is important for the synthesis, repair, and metabolism of muscle, cells, and tissues. A number of studies have been conducted at the University of Texas, including a clinical study that suggested essential amino acid supplements may support muscle anabolism in the elderly. Another clinical study performed at the university's metabolism unit in the Department of Surgery indicated that supplementing with essential amino acids promotes healthy muscle protein synthesis after resistance exercise.