Each veggie capsule of L-Citrulline from The Vitamin Shoppe brand provides 1000 mg to boost nitric oxide production. Let's connect the dots for how l-citrulline supports healthy BP, cardiovascular health and exercise performance: your kidneys convert l-citrulline into an amino acid (l-arginine), which breaks down into nitric oxide It's that nitric oxide that relaxes blood vessels and increases blood flow. The circulation of blood to your hard-working, power-lifting, yoga-bending, bike-riding muscles helps support endurance and recovery. Yep, that l-citrulline is one awesome amino acid. Benefits: Supports nitric oxide Supports cardiovascular health Free-form Gluten-free Dairy-free Soy-free Nut-free