Copper is a mineral. It is found in foods such as organ meats, seafood, nuts, seeds, wheat bran cereals, grain products, and cocoa products. The body stores copper mostly in the bones and muscles. The liver regulates the amount of copper that is in the blood.

Copper is most commonly used for treating copper deficiency and the anemia it may cause. Having too little copper (copper deficiency) is very rare. It sometimes occurs in people who get too much zinc from diet or supplements, have intestinal bypass surgery, or are fed by feeding tubes. Malnourished infants can also have copper deficiency.