From the Manufacturer's Label:
Healthy Protein Metabolism**
Ornithine is a non-essential amino acid that plays a central role in the urea cycle, functioning along with Arginine and Citrulline to rid the body of ammonia, a byproduct of protein metabolism. Because Ornithine is converted into Arginine, it can help to maintain healthy Arginine levels in the body.** Ornithine can also be converted into other amino acids, such as citrulline, proline, and glutamate, as well as creatine, an important muscular energy source.**
Manufactured by Now® Foods.Contains no sugar, salt, yeast, wheat, gluten, corn, soy, milk, egg, shellfish or preservatives.