Copper doesn’t get much attention compared to minerals like iron or calcium, but it plays essential and interconnected roles throughout the body — including a surprising relationship with the very iron levels it’s often overshadowed by. Here’s what copper actually does.
What Is Copper and Why Does the Body Need It?
Copper is a trace mineral required as a cofactor for numerous enzymes involved in energy production, connective tissue formation, and neurological function. Though needed only in small amounts, its role in several key processes makes it essential for overall health.
Key Functions in the Body
Iron metabolism. Copper-dependent enzymes are required for the body to properly transport and utilize iron. This is why chronic copper deficiency can actually contribute to a form of anemia that resembles iron deficiency, even when iron intake is adequate.
Connective tissue formation. Copper is required for the enzyme lysyl oxidase, which helps cross-link collagen and elastin — proteins essential for the strength and flexibility of skin, blood vessels, and other connective tissues.
Antioxidant defense. Copper is a component of superoxide dismutase, an important antioxidant enzyme that helps protect cells from oxidative damage.
Nervous system function. Copper-dependent enzymes play roles in producing neurotransmitters and maintaining the protective myelin sheath around nerves.
Energy production. Copper is involved in mitochondrial enzymes responsible for generating cellular energy.
Food Sources
Copper is found in a variety of foods, including:
- Organ meats, particularly liver
- Shellfish, especially oysters
- Nuts and seeds (cashews, sunflower seeds)
- Whole grains
- Dark chocolate
- Legumes
- Potatoes
Signs of Copper Deficiency
True copper deficiency is relatively uncommon but can occur, particularly in specific circumstances:
- Fatigue and weakness
- Frequent illness, due to impaired immune function
- Pale skin
- Unexplained anemia that doesn’t respond to iron supplementation alone
- Weakened bones
- Neurological symptoms, including numbness or difficulty with coordination in more significant cases
What Causes Copper Deficiency?
Excessive zinc intake is one of the more well-documented causes, since high zinc levels interfere with copper absorption in the intestine — a relevant consideration for people taking high-dose zinc supplements over extended periods.
Malabsorption conditions, such as celiac disease or those following bariatric surgery, which can reduce copper absorption.
Rare genetic conditions, such as Menkes disease, which specifically impairs copper absorption and transport.
The Copper-Zinc Balance
Copper and zinc compete for absorption in the digestive tract, and maintaining an appropriate balance between the two is important. This is one reason multivitamins and mineral supplements often include both nutrients in balanced ratios, and why long-term high-dose zinc supplementation without corresponding copper intake is generally discouraged unless specifically directed by a healthcare provider.
How Much Do You Need?
The recommended daily intake for adults is 900 mcg, an amount readily achievable through a varied diet that includes some nuts, whole grains, or occasional shellfish or organ meats.
Can You Get Too Much Copper?
Excess copper intake, primarily from supplements or in rare cases from contaminated water sources, can cause nausea, vomiting, abdominal pain, and in severe or chronic cases, liver damage. A rare genetic condition called Wilson’s disease causes copper to accumulate to toxic levels in the body and requires specific medical management, including dietary copper restriction.
The Bottom Line
Copper plays essential, interconnected roles in iron metabolism, connective tissue health, and antioxidant defense, and most people meet their needs easily through a varied diet. Its close relationship with zinc is worth keeping in mind, particularly for anyone taking high-dose zinc supplements over an extended period.
This article is for informational purposes only and is not a substitute for professional medical advice.
