Benefits

What are the signs of copper deficiency?

Last reviewed: May 2026

The short answer

The clinically established signs of copper deficiency are anemia (often resistant to iron supplementation), neutropenia (low neutrophil count), fatigue, bone fragility, hair color and texture changes, and — in severe, chronic cases — neurological symptoms including sensory ataxia and myelopathy. Mild copper insufficiency is harder to identify and may produce more subtle, non-specific symptoms.

Established clinical signs

• Anemia — often microcytic or macrocytic, frequently does not respond to iron supplementation because the iron cannot be properly mobilized without copper-dependent ceruloplasmin
• Neutropenia — low neutrophil count, sometimes with broader pancytopenia
• Fatigue — particularly exertional fatigue, related to impaired mitochondrial energy production (cytochrome c oxidase is copper-dependent)
• Bone fragility and osteoporosis, related to impaired lysyl oxidase activity
• Premature graying or hair color changes
• Skin depigmentation
• Frequent infections
• Elevated LDL cholesterol
• Sensory ataxia and myelopathy — signs of severe, established deficiency, which can be only partially reversible

Who is at risk

• People taking high-dose zinc supplements for extended periods (the most common cause of acquired copper deficiency in otherwise healthy adults)
• People who have had bariatric surgery, particularly Roux-en-Y gastric bypass and biliopancreatic diversion
• People with chronic GI conditions affecting absorption (celiac disease, Crohn's disease, short bowel syndrome)
• People on long-term total parenteral nutrition without adequate copper supplementation
• Infants fed cow's milk or formula low in copper (rare in modern formula products)
• People using high doses of certain proton pump inhibitors long-term

What does not reliably indicate copper deficiency

• Single symptoms like fatigue or hair thinning, in isolation, without other findings
• Hair mineral analysis (this test is not considered clinically reliable for diagnosing copper status)
• Self-assessment based on a list of vague symptoms shared with many other conditions

How copper status is actually tested

If you suspect copper deficiency, a healthcare provider can order serum copper and ceruloplasmin testing. These are not perfect tests — serum copper is affected by inflammation and other factors — but they are the standard. Reference ranges vary by lab. In some cases, additional testing (urine copper, erythrocyte copper-zinc SOD activity) is used.

Related questions

Copper and zinc balance (full article)
Which vitamin depletes copper?
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