GNC L-Arginine & L-Citrulline 500 mg: 500 500 . : . : L : 500 L : 500 ! Description: GNC L Arginine & L Citrulline 500 mg 500 mg offers a blend of amino acids that enhance nitric oxide production, aiding in improved blood flow and supporting vascular health. Usage Instructions: Take one to three caplets daily with food. Nutritional Facts per Serving: L Arginine: 500 mg L Citrulline: 500 mg Support your vascular health and physical performance with this effective supplement!