Supports Protein Metabolism*: This Non-Essential Amino Acid 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 Vegan Capsules/Healthy Immune System Function*: Citrulline Also Plays An Important Role In The Healing Process And In The Maintenance Of A Healthy Immune System Certifications/Classifications: Dairy Free, Egg Free, Kosher, Made Without Gluten, Non-Gmo, Nut Free, Soy Free, Vegan/Vegetarian Gmp Quality Assured: Npa A-Rated Gmp Certification Means That Every Aspect Of The Now Manufacturing Process Has Been Examined, Including Our Laboratory/Testing Methods (For Stability, Potency, And Product Formulation) Packaged In The Usa By A Family Owned And Operated Company Since 1968 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.* Natural Color Variation May Occur In This Product