NOW® Sports Taurine Muscle Duo is a combination of two ingredients formulated to enhance performance and maintain existing muscle.* Clinical studies in men have shown that taurine can help promote power production and increase agility.* It has also been shown to reduce exercise related muscle soreness.* Betaine helps to preserve cell volume and function during the stress of intense exercise.* Clinical studies show that betaine may help to promote endurance and optimize muscle output and performance during exercise.* It may also help to support a healthy body composition when used along with a healthy diet and exercise program.*