NOW&ampreg; AAKG contains Arginine, a conditionally essential amino acid that has a number of vital roles in human biochemistry.&ampnbsp; Arginine plays a pivotal role in the urea cycle, helping to rid the body of excess ammonia.&ampnbsp; This amino acid is also important in protein synthesis as well as for the support of healthy&ampnbsp; immune function.&ampnbsp; NOW&ampreg; AAKG has paired Arginine with Alpha-Ketoglutarate, another key player in amino acid metabolism, as well as in energy production.