Arginine is an amino acid that plays an important role in several important pathways, including the synthesis of proteins, the production of creatine phosphate, needed to produce ATP, and the synthesis of nitric oxide, a secondary messenger involved in blood flow.

Jarrow FORMULAS Arginine + Ornithine contains only crystalline, pure free form amino acids. L-Arginine is a semi-essential amino acid synthesized by the body from Ornithine. Arginine and Ornithine support protein synthesis as they are involved in the transport and storage of nitrogen. Arginine, as a part of physical performance, is used by muscle tissue to produce creatine.