Zinc is a component of more than 100 enzymes associated with various metabolic processes, including the synthesis of the nucleic acids RNA and DNA. It is required for the transport of Vitamin A from the liver, and as part of superoxide dismutase helps protect cells from free radicals. Zinc is also required for normal growth and development, reproductive development and function, and to support the immune system, where it has been shown to increase T-lymphocytes and enhance other white blood cell functions. However because of its effect on increasing white blood cell counts, a higher intake of zinc is contraindicated with some forms of leukemia... Full Text