Copper is a trace metal essential needed for energy production, wound healing, nervous system health and other body functions. It is highly unusual to have a problem with too much copper in your system, but having too little copper can exacerbate arthritis, cancer, osteoporosis, depressed immunity and neurological problems.
There is even some evidence that copper supplementation may slow Alzheimer's disease. The bottom line is that some copper should be in your diet. There are many foods such as nuts, seeds whole grains and legumes that are rich in copper. Other than that you should take a multivitamin that supplies no more than 100% of the RDA for copper.