L-Arginine is a nonessential amino acid in human. ... It is a substrate of nitric oxide synthase, which is converted to L-citrulline and nitric oxide (NO).
l-arginine promotes intrauterine growth of the fetus by increasing bioavailability of endothelial nitric oxide (NO) production and improving the umbilical artery flow in pregnant women with pregnancy-induced hypertension and fetal growth restriction.
Lysine is taken by mouth to improve athletic performance and for improving symptoms of schizophrenia. Lysine is also used to reduce symptoms of canker sores, and for diabetes, high triglyceride levels in the blood, muscle strength, stress, and a metabolic condition called metabolic alkalosis