NOW Foods, L-OrnithineDescription Promote detoxification and ammonia removal with NOW Foods L Ornithine, an amino acid supplement. NOW Foods L Ornithine is a non GMO, vegetarian vegan, and kosher dietary supplement that supports healthy protein metabolism as a non essential amino acid. Ornithine plays a central role in the urea cycle, ridding the body of ammonia, and can be converted into other amino acids like arginine, citrulline, proline, and glutamate, as well as