Men's Health Promotes Stamina & Performance Supports Sexual Health Supports Vascular Health 3,000 mg Per Serving Vegetarian Dietary Supplement Ingredients for Improved Stamina & Performance Because of the role that L-Arginine plays in vasodilation, in addition to improved sexual health, it also promotes healthy blood vessels and support vascular health. Additionally, it supports muscle mass, athletic performance and immune activity. Clinical studies suggest that a minimum of 3,000 mg of L-Arginine is optimal to support vascular health and its associated Erectile Function. The added B Vitamins (B-6, B-12, and Folic Acid) are vital to the body's energy production. The result - lasting energy, stamina and performance. Advanced Erectile Function Formula Natrol L-Arginine 3,000 mg is an extra strength formula designed to help improve sexual health by enhancing blood flow critical to achieving heightened sexual arousal. L-Arginine is an amino acid that plays a beneficial role in overall vascular health by providing the nitrogen our bodies use to produce NO (nitric oxide). NO plays a vital role in enhancing blood flow to the smooth muscles, critical in achieving heightened sexual arousal and performance.