Copper Deficiency — the mineral
nobody talks about until
zinc depletes it.
Copper doesn’t get headlines. It doesn’t trend on Instagram. Nobody searches for “best copper supplement.” But it is a cofactor for at least 12 enzymes your body depends on — from making energy to building collagen to mobilising iron from your liver. And if you’re taking a daily zinc supplement without copper, you may be slowly, silently depleting it. This is the science of why copper matters, how zinc disrupts it, and why most supplement formulas get this wrong.
Why copper is quietly essential — and what happens when it runs low
Copper is not a “trace mineral” in the sense of being optional or negligible. It is a cofactor for at least 12 critical enzymes spanning energy production, iron metabolism, collagen synthesis, antioxidant defence, neurotransmitter production, and melanin formation. Without adequate copper, none of these systems function correctly — and the symptoms it produces are so commonly attributed to other causes that copper deficiency is one of the most underdiagnosed mineral problems in clinical practice.
A 2022 paper in the Journal of Nutritional Science (Cambridge) described the current situation as a “contemporaneous epidemic of chronic copper deficiency” — a condition that is both widespread and systematically overlooked because clinicians rarely test for it unless they already suspect it.
The six enzymes that make copper non-negotiable
Cytochrome c Oxidase
The final enzyme in the mitochondrial electron transport chain — the step where oxygen is consumed and ATP (cellular energy) is actually produced. Without copper, this enzyme cannot function.
Ceruloplasmin
Carries ~70% of serum copper and is essential for mobilising iron from stores into the bloodstream. Copper deficiency causes a secondary iron deficiency — even when iron intake is adequate — because the body cannot move its iron stores without ceruloplasmin.
Lysyl Oxidase
Crosslinks collagen and elastin fibres — the structural proteins in skin, bones, blood vessels, tendons, and cartilage. Without adequate lysyl oxidase activity, connective tissue loses its structural integrity.
Cu/Zn-SOD (Superoxide Dismutase)
One of the body’s primary antioxidant enzymes. Requires both copper AND zinc as cofactors. Zinc supplementation without copper depletes the very mineral needed for this zinc-containing enzyme to function.
Dopamine Beta-Hydroxylase
Converts dopamine to norepinephrine — a neurotransmitter involved in focus, alertness, and the stress response. Copper deficiency reduces this conversion, contributing to mood disturbance and poor concentration.
Tyrosinase
Converts tyrosine to melanin — the pigment in hair, skin, and eyes. Premature greying of hair and skin depigmentation are clinically associated with low copper status.
ZICD — how zinc supplements silently deplete copper
This is not a theoretical risk. Zinc-induced copper deficiency (ZICD) is a clinically documented condition — including a 2025 case in Hematology Reports (Chun et al., PMID: 40700102) describing ZICD causing anaemia, and a separate 2025 case describing ZICD mimicking myelodysplastic syndrome, specifically highlighting the post-COVID trend of self-prescribed zinc supplementation as a growing cause.
The mechanism — metallothionein and competitive binding
When zinc intake exceeds what the body immediately needs, the excess triggers upregulation of a protein called metallothionein (MT) inside intestinal enterocytes. Metallothionein binds both zinc and copper — but copper has a stronger binding affinity and outcompetes zinc for MT binding sites. The copper-bound metallothionein is then lost when enterocytes naturally shed every 3-5 days, carrying the trapped copper out of the body entirely.
This is gradual and cumulative — weeks and months of sustained zinc supplementation progressively depleting whole-body copper stores. Early symptoms (fatigue, mild anaemia, slightly more frequent colds) are so non-specific that most people attribute them to stress or “just running down.”
“Copper deficiency resulting from prescribing zinc in high doses is a rare but life-changing diagnosis that is frequently overlooked. Neurological deficits are particularly concerning, as they may be only partially reversible despite supplementation.”
Duncan et al. — British Journal of Clinical Pharmacology, 2023A 2025 clinical review in CMAJ confirms: zinc excess above 40mg/day from supplements or dental adhesives is a recognized cause of copper deficiency, recommending testing serum copper, ceruloplasmin, AND serum zinc together when deficiency is suspected.
Why ZICD cases are increasing right now
During COVID-19, zinc was widely promoted as an immune booster. Millions of Indians began self-prescribing zinc at 25-50mg/day — doses that, without copper co-supplementation, can develop ZICD over months. Many are still taking zinc daily, years later, without copper. The “immune booster” zinc tablets that proliferated in 2020-2021 almost universally omit copper. If you started zinc during COVID and never stopped, getting your serum copper checked is worth doing.
Symptoms — from subtle to serious
Fatigue & pallor
Copper is needed for ceruloplasmin-mediated iron mobilisation. Low copper → anaemia → fatigue and pallor, even when dietary iron is adequate. This is why iron supplements sometimes don’t fix anaemia — the bottleneck is copper, not iron.
Frequent infections
Neutropenia (low neutrophil white blood cells) is one of the earliest haematological signs. Neutrophils are the body’s first-line immune defence. Low copper → fewer neutrophils → increased susceptibility to bacterial infections.
Poor wound healing
Lysyl oxidase needs copper to crosslink collagen. Without it, new tissue formation at wound sites slows. Cuts take longer to close, bruises last longer.
Premature greying of hair
Tyrosinase needs copper to produce melanin. Reduced tyrosinase activity → greying hair, sometimes decades earlier than genetic timing would predict.
Joint & connective tissue issues
Lysyl oxidase impairment weakens collagen and elastin throughout the body. Joint laxity, premature skin ageing, reduced tendon and blood vessel integrity.
Mood changes & poor focus
Dopamine beta-hydroxylase needs copper to convert dopamine to norepinephrine. Reduced conversion → altered catecholamine balance → potential mood disturbance and impaired stress response.
Numbness, tingling, unsteady gait
Peripheral neuropathy, sensory ataxia, and myelopathy (spinal cord damage). These neurological symptoms may not fully reverse even after copper levels are restored. Requires medical attention.
Bone fragility
Copper supports osteoblast function and collagen crosslinking in bone matrix. Severe deficiency contributes to osteoporosis-like changes.
Sideroblastic anaemia
Iron accumulates inside red blood cell precursors because ceruloplasmin cannot mobilise it. This pattern can mimic myelodysplastic syndrome — the exact misdiagnosis documented in the 2025 case report.
Copper-rich Indian foods
The key point: for most adults eating a balanced diet, dietary copper is usually adequate. The danger is not low copper intake from food — it is zinc supplementation disrupting the zinc-copper balance.
Check your own supplement — does it include copper?
Find your current zinc supplement and answer these three questions
1. Does it include copper at all? Most don’t. If the ingredients list contains “Zinc” but no “Copper,” you are supplementing without the balance that prevents ZICD. This includes most ZMA formulas, standalone zinc tablets, and “immune booster” products.
2. What is the zinc-to-copper ratio? Divide elemental zinc mg by elemental copper mg. If above 12:1, the copper may be insufficient. 10:1 is the recommended range. Element 5 maintains 13mg zinc : 1.3mg copper = exactly 10:1.
3. What form is the copper in? Look for “Copper Bisglycinate” or “Copper (as Bisglycinate Chelate)” — the chelated form evaluated by EFSA as “not of safety concern.” Avoid “Copper Oxide” or “Cupric Oxide” — poorly absorbed. Full zinc form comparison →
Element 5 by EVO HOMINUS — zinc that doesn’t deplete you.
Element 5 includes 1.3mg elemental copper as copper bisglycinate alongside 13mg elemental zinc as zinc bisglycinate — maintaining a 10:1 ratio within the range independently recommended by Maret & Sandstead. Both forms evaluated by EFSA and found “not of safety concern.” Most competing formulas skip copper entirely. Element 5 doesn’t, because sustained zinc without copper is a documented risk. Alongside four-source chelated magnesium (300mg elemental), manganese for mitochondrial Mn-SOD, boron for bone metabolism, and P5P (Pyridoxal-5′-Phosphate, active Vitamin B6) for cellular mineral transport.
Copper deficiency & ZICD, answered plainly.
Studies and references cited on this page
- Stiles LI, Ferrao K, Mehta KJ. “Role of zinc in health and disease.” Clin Exp Med. 2024;24:38. — ZICD mechanism, metallothionein, neurological consequences.
- Chun N, Aman S, Xu D, et al. “Anemia Due to Unexpected Zinc-Induced Copper Deficiency.” Hematol Rep. 2025;17(4):35. PMID: 40700102
- CMAJ Clinical Review. “Copper deficiency.” CMAJ. 2025;197(16):E456. — Zinc >40mg/day recognized ZICD cause.
- Duncan A, et al. “Iatrogenic copper deficiency.” Br J Clin Pharmacol. 2023;89(8):2572-2577.
- Klevay LM. “The contemporaneous epidemic of chronic copper deficiency.” J Nutr Sci. 2022;11:e89.
- Maret W, Sandstead HH. “Zinc requirements and the risks and benefits of zinc supplementation.” J Trace Elem Med Biol. 2006;20:3-18. — Zn:Cu ratio ≤10-12.
- EFSA AFC Panel. “Opinion on certain bisglycinates.” EFSA Journal. 2008;718:1-26. — Copper bisglycinate “not of safety concern.”
More from the EVO HOMINUS Science Hub
Zinc Deficiency in India — The Symptoms Most People Miss
Why zinc deficiency is rising, which form absorbs best, and why it needs copper alongside it.
Read the guide → Nutrition Science HubZinc: Bisglycinate vs Picolinate vs Gluconate
The full form comparison — absorption data, tolerance profiles, and why bisglycinate leads.
Read the guide → ProductElement 5 — Four-Source Magnesium + Zinc + Copper
The only formula with zinc bisglycinate balanced by copper bisglycinate at a 10:1 ratio.
See the formula →