L Citrulline vs L Arginine: Boost Your Performance! 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 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 Why L Citrulline + L Arginine is better than just L Citrulline : r Biohackers