Optimum Nutrition ZMA – Anabolic Hormone Levels and Muscle Strength! May Increase Endurance, Healing, Growth & Restful Sleep!Increase Anabolic Hormone Levels and Muscle Strength!This university laboratory tested anabolic formula has been proven to enhance healthy hormone production, leading to an average of 2.5 times greater muscle strength gains in athletes!Two recent clinical trials have shown that a synergistic combination of Zinc Monomethionine Aspartate, Magnesium Aspartate, and Vitamin B6 can significantly increase anabolic hormone levels and muscle strength in well-trained athletes. The novel Zinc Monomethionine Aspartate formula may also help to increase endurance, healing, growth and restful sleep. Note: Manufacturers continually change product specifications. While we try our best to keep product descriptions up to date, they do not necessarily reflect the latest information available from the manufacturer. We are not responsible for incorrect or outdated product descriptions and/or images.