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. Patented Zinc Monomethionine Aspartate with Magnesium, and B6 Combination. Optimum Nutrition's ZMA is produced and packaged in our own state-of-the-art, OTC approved manufacturing facility. ZMA is the original Zinc-Magnesium supplement developed by SNAC System, Inc. and the only one validated by published research.