🧬 Family & Essentiality

🌿 Plain-Language Summary

Copper is a trace mineral that supports connective tissue strength, iron transport, antioxidant defences, and nervous system function. It works through proteins like ceruloplasmin, which helps move iron in the body, and enzymes that stabilise collagen and protect cells from oxidative stress.

⚗️ Molecular & Chemical IDs

• Element: Cu (Copper)
• Atomic number: 29
• Key transport proteins: ceruloplasmin, albumin

⚡ Functions

• Cofactor for enzymes: cytochrome c oxidase (energy), lysyl oxidase (collagen cross-linking), superoxide dismutase (antioxidant)
• Mobilises iron via ceruloplasmin (ferroxidase activity)
• Supports myelin formation and neurotransmitter metabolism
• Plays a role in pigmentation and connective tissue resilience

🍽️ Absorption & Bioavailability

🥗 Food Sources

• Shellfish (especially oysters), organ meats (liver — occasional)
• Nuts, seeds, legumes, cocoa
• Whole grains

🇦🇺 Australian NRVs (NHMRC)

• AI (Men): 1.7 mg/day
• AI (Women): 1.2 mg/day
• Pregnancy: 1.3 mg/day
• Lactation: 1.5 mg/day
• UL (Adults): 10 mg/day

🚨 Deficiency & Excess

Deficiency

May cause anaemia unresponsive to iron, low white blood cells (leukopenia/neutropenia), connective tissue weakness, bone abnormalities, and neuropathy. Severe deficiency is rare outside of malabsorption or excess zinc intake.

Excess

High intakes may cause nausea, abdominal pain, and liver toxicity. Genetic conditions like Wilson’s disease (copper overload) or Menkes disease (copper transport defect) require specialist management.

🧪 Testing & Monitoring

• Serum copper and ceruloplasmin are routine markers
• 24-h urinary copper may help assess excess
• Genetic testing in suspected Wilson’s or Menkes disease

🔄 Interactions

• High-dose zinc supplementation can induce copper deficiency
• Excess iron may also compete with copper absorption
• Balance among trace minerals (zinc, copper, iron) is essential for safe supplementation

📊 Evidence Snapshot

• 🔬✅ Well-established: Copper is required for blood cell formation, connective tissue strength, and antioxidant defences
• ⚠️ Clinical caution: Monitor copper status in long-term high-dose zinc use, bariatric surgery, or unexplained anaemia