Tag: Non protein amino acid

L-theanine is a unique, water-soluble amino acid found predominantly in tea plants, but unlike the 20 standard proteinogenic amino acids, it is not used to synthesize protein. Its distinct biochemical role is tied to promoting relaxation and improving cognitive function, separate from the body's primary protein-building activities.

Citrulline is a fascinating amino acid that, unlike the 20 standard protein-building amino acids, serves a different and vital metabolic role within the body. Named after the watermelon from which it was first isolated, citrulline is categorized as a non-essential, non-protein amino acid, playing a pivotal role in the urea cycle and enhancing nitric oxide production.