L-Arginine is a precursor to nitric oxide (NO), a molecule that helps dilate blood vessels. This leads to improved blood flow, which can enhance oxygen and nutrient delivery to muscles, leading to better performance, endurance, and muscle pumps during exercise. Due to its vasodilating effects, L-Arginine can lead to more intense muscle pumps during workouts. Increased vascularity and blood flow can also give your muscles a fuller, more defined appearance.
