Doctor’s Best L-arginine is a Scientifically Formulated Supplement That Delivers a Vital Amino Acid Essential for Nitric Oxide Production, Which Promotes Healthy Blood Circulation and Cardiovascular Function. L-arginine Plays a Key Role in Enhancing Circulation, Aiding Wound Healing, and Supporting Mental Clarity, Immune Health, and Memory. As a Precursor to Creatine, It Also Helps Improve Muscle Mass, Boost Endurance, and Aid in Recovery From Physical Activity.