Why consider taking l arginine and l citrulline together Infinite Labs Citrulline vs. Arginine Which One's Better for Vasodilation? @moreplatesmoredates A lot of pre workouts still include Arginine under the assumption that since it's the direct precursor to nitric oxide, it must be Oral supplementation with a combination of l citrulline and l arginine rapidly increases plasma l arginine concentration and enhances NO bioavailability ScienceDirect L Citrulline vs L Arginine: The Right Amino Acid for Formula Buy L Citrulline & L Arginine Tablets for Enhanced Performance FB NUTRITION