Copper
trace-mineral
Key Takeaways
- Copper is a cofactor for cuproenzymes involved in energy production, iron metabolism, and neurotransmitter synthesis
- FDA daily value is 0.9 mg (900 mcg) for adults; RDA is 900 mcg for adults 19+
- Deficiency is uncommon but causes anemia, bone defects, and neurological problems
- Average dietary intake is approximately 1,400 mcg/day for men and 1,100 mcg/day for women
- Copper-zinc superoxide dismutase is a key antioxidant defense enzyme
Evidence Spectrum
14 studies reviewed →Wound healing
Copper contributes to wound healing through its roles in collagen cross-linking via lysyl oxidase and connective tissue synthesis. Studies support copper's involvement alongside other minerals in wound care.3
14
Studies Reviewed
200 mcg
RDA (Birth to 6 months (AI))
10000 mcg
Upper Limit
Role in the Body
Copper is an essential trace mineral that serves as a cofactor for several enzymes known as cuproenzymes. These enzymes are involved in energy production, iron metabolism, neuropeptide activation, connective tissue synthesis, and neurotransmitter synthesis. One key cuproenzyme is ceruloplasmin, which carries more than 95% of the total copper in healthy human plasma and plays a critical role in iron metabolism. Copper is also involved in angiogenesis, neurohormone homeostasis, regulation of gene expression, brain development, pigmentation, and immune system functioning. The copper-containing superoxide dismutases serve as a primary defense against oxidative damage. The average adult body contains 50 to 120 mg of copper, with almost two-thirds located in the skeleton and muscle. Copper is absorbed primarily in the upper small intestine, and body levels are homeostatically maintained through intestinal absorption and hepatic excretion into bile.
- Cofactor for cuproenzymes in energy production
- Iron metabolism via ceruloplasmin
- Connective tissue synthesis (lysyl oxidase for collagen/elastin cross-linking)
- Neurotransmitter synthesis (dopamine beta-hydroxylase)
- Antioxidant defense via copper-zinc superoxide dismutase
- Melanin synthesis and pigmentation
- Immune system function
Supplement Forms
Copper gluconate
RecommendedBioavailability: 0%
Common supplement form; well-tolerated. Specific bioavailability comparison data not available in rawData.
Copper sulfate
Bioavailability: 0%
Used in some supplements; may cause more GI side effects. Bioavailability data not available in rawData.
Cupric oxide
Bioavailability: 0%
Used in the AREDS2 formulation alongside zinc. Bioavailability data not available in rawData.
Food Sources
Organ meats (liver)
Shellfish (oysters, crab, lobster)
Nuts and seeds (cashews, sunflower seeds)
Dark chocolate and cocoa
Whole grains
Mushrooms
Legumes (lentils, chickpeas)
Potatoes
Dates
Deficiency
Prevalence: Uncommon in humans under normal dietary conditions
Symptoms:
- Anemia (not responsive to iron supplementation)
- Hypopigmentation of hair and skin
- Hypercholesterolemia
- Connective tissue disorders
- Osteoporosis and bone defects
- Abnormal lipid metabolism
- Ataxia and neurological problems
- Increased susceptibility to infections
Risk Factors:
- Bariatric surgery (malabsorption)
- Excessive zinc supplementation (zinc competes with copper absorption)
- Menkes disease (genetic copper malabsorption)
- Celiac disease and inflammatory bowel disease
- Prolonged parenteral nutrition without copper supplementation
Safety & Interactions
Possible Side Effects:
- • Nausea, vomiting, and abdominal pain at high doses
- • Liver damage with chronic excessive intake
- • Gastrointestinal distress
Drug Interactions:
- • High-dose zinc supplements reduce copper absorption
- • Iron supplements may compete with copper for absorption
- • Antacids may reduce copper absorption
Contraindications:
- • Wilson disease (genetic copper accumulation disorder)
- • Indian childhood cirrhosis and other copper storage disorders
Frequently Asked Questions
Why is copper important for the body?
Copper is a cofactor for enzymes involved in energy production, iron metabolism, connective tissue synthesis, neurotransmitter production, and antioxidant defense.
How much copper do adults need daily?
The RDA for adults is 900 mcg (0.9 mg) per day. The FDA daily value is also 0.9 mg. The tolerable upper intake level is 10 mg per day.
Can too much zinc cause copper deficiency?
Yes. Excessive zinc supplementation can interfere with copper absorption and lead to copper deficiency over time.
What are the best food sources of copper?
Organ meats (especially liver), shellfish like oysters, nuts, seeds, dark chocolate, whole grains, and mushrooms are rich dietary sources of copper.
Research Sources
15 peer-reviewed studies analyzed from PubMed. 5 directly cited in this review.