ZINPRO?40 (zinc methionine complex) is a nutritional feed ingredient for animals that contains 4 % organic zinc. The trace mineral zinc is required by animals for numerous functions, including: immunity, reproduction, skin and hoof integrity, muscle development, milk production and eggshell quality. In addition, when an animal has the proper balance of organic trace minerals it is better able to cope with the challenging effects of stress. ZINPRO, from Zinpro Performance Minerals?, is built on a unique, patented molecule that consists of one metal ion bound to one amino acid ion ? called a metal specific amino acid complex. Zinpro Performance Minerals provide the highest biological efficacy of any trace mineral products on the market. For more than 45 years, Zinpro Performance Minerals have delivered positive animal performance responses and a strong return on investment in operations around the world