This supplement contains 600mg of liver extract the equivalent of ornithine from 270 clams* two types of amino acids arginine & citrulline to support those who want to work hard as well as zinc selenium & vitamin B2. Ornithine is found in a limited number of foods such as clams & cheese & is an amino acid that is difficult to obtain from everyday meals. This supplement contains liver extract & three types of amino acids. * The amount of ornithine contained in one clam is calculated as 0.44mg.