MET-Rx® Xtreme NitroPump NOS Arginine Alpha-Ketoglutarate is an amino acid compound that helps maintain normal, healthy blood flow and nutrient delivery to muscle cells. This supplement is important for circulation of muscle glucose and other nutrients to muscleuptake during exercise. • Contains Arginine, an amino acid that can serve as a precursor for the formation of Nitric Oxide. • Advanced time-release delivery system to further facilitate continual absorption of Arginine into the blood stream.