Zinc is a mineral that is required for the proper function of more than 300 enzymes, most of them involved in protein and DNA synthesis plus cell division, growth, and repair. Zinc is a constituent of insulin and male reproductive fluid, stored primarily in muscle, zinc is also found in high concentrations in red and white blood cells, the retina of the eye, bones, skin, kidneys, liver, and pancreas. Zinc promotes antioxidant and immune functions, stabilizes and maintains the structural integrity of biological membranes, and plays a pivotal role in skin and connective tissue metabolism and repair.