Among it's many functions, copper aids in the formation of bone, hemoglobin, and red blood cells, and works in balance with zinc and Vitamin C to form elastin, an important skin protein.  It is involved in the healing process, energy production, hair and skin coloring, and taste sensitivity.
This mineral is also needed for healthy nerve and joints.  One of the early signs of copper deficiency is osteoporosis.  Copper is essiential for the formation of collagen, one of the fundamental proteins making up bones, skin, and connective tissue.  Other possible signs of copper deficiency include anemia, baldness, diarrhea, general weakness, impaired respiratory function, and skin sores.  A lack of copper can also lead to increased blood fat levels.