The body uses copper, an essential mineral, to make enzymes. These enzymes are necessary for the regulation of iron metabolism, development of connective tissue, cellular energy production, production of melanin (the pigment responsible for skin colour) and nervous system function. This examination quantifies the level of copper in the liver, urine, or blood (hepatic). Nuts, chocolate, mushrooms, shellfish, whole grains, dried fruit, and liver are just a few of the foods that contain copper. Copper can be absorbed into drinking water when it passes through copper pipes, and it can also be absorbed into food when it is prepared or served on copper plates.