Ornithine is an amino acid that does not occur in proteins but is important in the formation of urea. L-Ornithine is a nonprotein amino acid. It is used in the body in the biosynthesis of L-arginine, L-proline and polyamines.
L-Ornithine is a basic amino acid, positively charged at physiological pH. It is also known as alpha,delta-diaminovaleric acid and 2,5-diaminopentanoic acid. Its molecular formula is C5H12N2O2, and its molecular weight is 132.16 daltons.
L-Ornithine can be changed into L-Arginine in the body and it functions similarly in growth hormone release.