What it does
Copper works through enzymes rather than serving as a direct energy source. True deficiency is uncommon but can occur with malabsorption, some genetic conditions, or excessive zinc supplementation.
Food sources and absorption
Shellfish, seeds, nuts, organ meats, wheat-bran cereals, whole grains, and chocolate can contribute. A varied diet generally provides multiple sources.
Safety and individual context
High zinc intake over time can reduce copper absorption. Both deficiency and excess can be harmful, so isolated high-dose mineral supplementation deserves professional review.
Primary reference
NIH Office of Dietary Supplements consumer fact sheet
How to use this information
Reference values describe population needs and are not a diagnosis. Food patterns, health conditions, pregnancy, laboratory results, and medications can change what is appropriate. Avoid high-dose supplementation unless there is a clear reason and qualified guidance.