Description Supports Protein Metabolism Healthy Immune System Function Non-Gmo A Dietary Supplement Vegetarian/Vegan Kosher Amino Acids Family Owned Since 1968 Gmp Quality Assured Citrulline Is A Non-Essential Amino Acid That Is An Important Intermediate In The Urea Cycle Functioning Along With Other Amino Acids To Rid The Body Of Ammonia A Byproduct Of Protein Metabolism. Citrulline Also Plays An Important Role In The Healing Process And In The Maintenance Of A Healthy Immune System.