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.