NOW Foods L-Citrulline 750 mg provides a pure, pharmaceutical-grade dose of this conditionally essential amino acid that serves as the body's most effective way to raise arginine levels — outperforming direct arginine supplementation because citrulline bypasses first-pass liver metabolism. L-citrulline is converted to arginine in the kidneys, which then drives nitric oxide (NO) production for vasodilation, improved blood flow, and enhanced oxygen and nutrient delivery to working muscles. Clinical research supports citrulline for reduced exercise fatigue, improved aerobic and anaerobic performance, lower post-workout muscle soreness, and cardiovascular health. NOW Foods delivers 750 mg of pure citrulline (not the malate combination) per capsule — allowing flexible, precise dosing without malate content. Manufactured in NOW's GMP-certified facility with identity and purity verification.