Copper is the third most abundant dietary trace metal after iron and zinc. It plays an important role in a number of functions, including the production of blood cells, regulation of heart rate and blood pressure, absorption of iron, prevention of inflammation of the prostate, the development and maintenance of bone, connective tissue, and organs such as the brain and heart. It also contributes to the function of the immune and nervous systems, energy production, iron transport in the body and the protection of cells from oxidative stress.