. . . " lining of blood vessels.* May help regenerate skin, heart, kidneys, thymus, bone, and other tissues.Mood and Energy* Helps reduce muscular fatigue during exercise.* Can increase physical energy and endurance.* Increases blood flow to the brain for heightened mental acuity.CLINICAL STUDY UPDATEWe have recently completed analysis of the clinical effects of the activated amino acid L-arginine." . .