Nitric Oxide Supplement Allergy Research Group 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 l Citrulline Supplementation: Impact on Cardiometabolic Health