Among the foods high in copper, offal are leading with up to 15mg of copper per 100g consumed. They are followed by shellfish and other crustaceans (up to 10mg per 100g), chocolate is also a source of copper as well as dried fruits and vegetables.
Copper, in synergy with iron, allows oxygen to bind to red blood cells to be transported throughout the body. Copper is also involved in strengthening the skeleton and helps bones and cartilages to be more resistant.
Finally, eating regular foods high in copper boosts the immune system. Copper is an important trace element with the recommended daily amounts to 800 mg for an adult.