Copper
Contributes to normal energy-yielding metabolism and to normal functioning of the nervous system.
Also known as Copper Gluconate, Copper Bisglycinate, Copper Sebacate
Common doses
1-2 mg
Best timing
Morning
Food
Take with food
Interactions
2 known
Copper is an essential trace mineral involved in iron metabolism, connective tissue formation, and antioxidant defence. It is a cofactor for several critical enzymes including ceruloplasmin (iron transport), lysyl oxidase (collagen cross-linking), and superoxide dismutase (antioxidant defence).
Copper deficiency is most commonly caused by long-term zinc supplementation without copper, rather than inadequate dietary intake. The zinc-induced copper deficiency is well-documented and can cause anaemia, neutropenia, and neurological symptoms that mimic B12 deficiency.
Most people get adequate copper from diet. Supplementation is primarily recommended as a companion to long-term zinc supplementation (>30 mg/day) to maintain the zinc-copper balance.
Key benefits
Iron metabolism
Copper is essential for iron transport via ceruloplasmin. Copper deficiency can cause iron-deficiency anaemia even when iron intake is adequate.
Connective tissue
Copper is a cofactor for lysyl oxidase, which cross-links collagen and elastin. Essential for healthy connective tissue.
Antioxidant defence
Copper-zinc superoxide dismutase (CuZnSOD) is a major intracellular antioxidant enzyme.
Neurological function
Copper is involved in neurotransmitter synthesis (dopamine beta-hydroxylase converts dopamine to norepinephrine). Deficiency causes neurological symptoms.
Available forms
Copper Bisglycinate
Chelated form. Well-absorbed and gentle on the stomach. Preferred for supplementation.
Copper Gluconate
Common form in supplements. Good absorption.
Copper Sulfate
Inorganic form. Adequate absorption but more likely to cause GI upset.
Food sources
- Liver and organ meats
- Oysters and shellfish
- Dark chocolate
- Cashews and almonds
- Mushrooms
- Sunflower seeds
Signs of deficiency
- Fatigue and weakness
- Frequent illness
- Weak and brittle bones
- Memory and learning problems
- Difficulty walking
- Pale skin
Upper intake limit
10 mg/day (NIH). Standard supplement dose is 1-2 mg when taken alongside zinc. Most people need copper supplementation only if they take >30 mg/day zinc long-term.
Research summary
Copper supplementation is primarily recommended to prevent zinc-induced deficiency, not as a standalone supplement. The zinc-copper ratio is important for long-term zinc users. Dietary copper is adequate for most people eating a varied diet.
Known interactions (2)
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1 flagZinc and Iron compete for the same absorption pathway. Take at least 2 hours apart.
Supplements
This information is for educational purposes only. It is not medical advice and does not diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare professional.