Ultimate Nutrition ZMA 90 is a unique anabolic formula that contains highly bio-available forms of zinc and magnesium. Vitamin B-6 further enhances absorption and utilization. ZMA® is a powerful, 100% natural supplement that has been clinically proven to increase free testosterone, total testosterone and insulin-like growth factor (GF-1) levels. It also heightens muscle strength in training athletes. Its synergistic combination of zinc, magnesium, and vitamin B-6 is designed to enhance muscle strength, endurance, healing and recovery after exercise.