1st Endurance Optygen HP. Features: Updated OptygenHP improves the body's utilization of oxygen, increases VO2 Max and anaerobic threshold while reducing lactic acid Provides 1500mg Beta-Alanine per serving which increases muscular endurance, boosts strength, improves exercise capacity and delays muscular fatigue Upgraded with Ashwagandha to modulate cortisol, improve power, and enhance VO2 Max Also includes a clinically effective dose of premium grade Rhodiola and Cordyceps because clinical research has shown the combination of these two endurance-specific adaptogens improves aerobic performance Newest version of HP has 500mg more Beta-Alanine than previous formula Specs: Description:OptygenHP Package:120/bottle