Zinc is needed for the proper growth and maintenance of the human body. It is called an “essential trace element” because very small amounts of zinc are necessary for human health. It is found in several systems and biological reactions, and it is needed for immune function, wound healing, blood clotting, thyroid function, and much more. Since the human body does not store excess zinc, it must be consumed regularly as part of the diet. Meats, seafood, dairy products, nuts, legumes, and whole grains offer relatively high levels of zinc.