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 + L Arginine Supplement 60ct Irwin Naturals L Citrulline vs L Arginine: The Right Amino Acid for Formula L Citrulline vs. L Arginine Ultimate Nutrition The Renal Safety of L Carnitine, L Arginine, and Glutamine in Athletes and Bodybuilders ScienceDirect