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 L Citrulline vs L Arginine: The Right Amino Acid for Formula L Citrulline vs. L Arginine For Harder Erections (Pick Carefully!) Oral supplementation with a combination of l citrulline and l arginine rapidly increases plasma l arginine concentration and enhances NO bioavailability ScienceDirect Dietary Arginine and Citrulline Supplements for Cardiovascular Health and Athletic Performance: A Narrative Review