Copper

Copper functions as a component of a number of enzymes used by the body to reduce molecular oxygen. The RDA is 900 μg/day. Most people achieve this through diet. People may struggle with adequate copper levels if their zinc intake is very high.

​The best food sources of copper are liver, oysters, shiitake mushrooms, cacao and spirulina. Other good sources of copper are shellfish, whole grains, legumes and potatoes.