Now Foods, Arginine & Ornithine, 250 CapsProduct Description Arginine & Ornithine combines two complementary amino acids in one convenient supplement. Arginine is required for proper elimination of urea from the body, which occurs through a critical metabolic cycle that detoxifies the body of nitrogen compounds that are normal byproducts of protein metabolism.* Ornithine is synthesized from Arginine and is a precursor of citrulline, proline and glutamic acid.* Both of these amino acids are