L Arginine L Citrulline Complex 2250mg per serving 240 Capsules 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 For Harder Erections (Pick Carefully!) Ditch arginine and go for L citrulline! This common blood flow improving ingredient has better absorption, boosts nitric oxide more effectively, and is way gentler on your stomach. If you take pre workout, check