Zinc is a trace metal. We need it to live. Unlike toxic metals, it’s supposed to be in our bodies and in our food. It’s especially important for proper functioning of the brain, the immune, endocrine and digestive system...really the entire body.
As a psychiatrist, I think a lot about zinc, because more than 90% of people with depression, behavioral disorders such as ADHD, autism and schizophrenia have low normal to deficient zinc levels, as do many elderly individuals and those with dementia.