GNC L-Arginine 500 mgGNC L Arginine 500 mg supports healthy circulation, energy, and workout performance with nitric oxide support for heart and vascular health. Supports healthy blood flow and circulation Promotes cardiovascular and vascular health May enhance energy, endurance, and workout recovery Provides 500 mg L Arginine per capsule Suitable for men and women GNC L Arginine 500 mg . : 500 L Arginine