Amino Acids Are Essential Protein Building Blocks

7. Non-Protein Amino Acids

Not all amino acids contribute to proteins. Ornithine and citrulline play a vital role in the urea cycle. They contribute to the production of nitric oxide, a substance that relaxes arteries and veins for the efficient transport of blood, oxygen, and nutrients throughout the body.

Athletes use ornithine to enhance performance. The amino acid helps heal wounds and reduces glutamine poisoning triggered by liver disease. Citrulline is a popular dietary supplement for treating muscle fatigue, neurodegenerative diseases, hypertension, diabetes, and erectile dysfunction.