Zinc is an essential mineral that is involved in numerous zinc-dependent metabolic processes. Zinc plays crucial roles in immune function, cellular growth and development, antioxidant activity, and brain function. Zinc is most commonly supplemented to reduce the frequency of illness. Zinc is a vital mineral that your body uses in countless ways. In fact, zinc is the second-most-abundant trace mineral in your body, after iron. Zinc is necessary for the activity of over 300 enzymes that aid in metabolism, digestion, nerve function and many other processes. In addition, it’s critical for the development and function of immune cells.