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NOW: L-Citrulline 750 mg Veg Capsules. PRODUCT DESCRIPTION Precursor to L-Arginine, a non-essential amino acid that is involved in protein synthesis Healthy Protein Balance Vegetarian / Vegan 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 by-product of protein metabolism. NPN 80046567 Adult Dosage: Take 2 capsules 2 times daily between meals. Each capsule contains: L-Citrulline 750 mg Non-Medicinal Ingredients: Veg Capsule (hypromellose, water), Calcium Carbonate, Magnesium Oxide, Stearic Acid (vegetable source).