Zinc Chloride Deficiency Zinc is essential to human health and maintaining human life. It is responsible for protecting the kidneys from toxins, production of at least half of the hormones that are produced in the human body, thyroid health, brain health, a component of superoxide dismutase, and plays a role in pretty much every organ and gland in the human body. But you don't want too much of it. It must be in balance with copper which is equally as critical to human health. Here are some of