NOW&ampreg; Pro-GH&amptrade; is an amino acid supplement that has been designed to support optimal sports performance.&ampnbsp; Pro-GH&amptrade; contains Arginine, Ornithine, and Glutamine which are necessary for maintenance of nitrogen balance and help to rid the body of excess ammonia.&ampnbsp; Lysine, an essential amino acid, is an essential component of proteins and muscle tissue and is needed for the body's production of hormones, enzymes, and collagen.&ampnbsp; Glycine, known for its role in glycogen synthesis, helps to support muscular energy output.&ampnbsp; Finally Glutamine and Glycine help to support healthy immune responses, especially during times of physical stress and intense exercise.*