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Copper

Essential trace mineral for metabolic functions

Evidence · Grade DSafety · Use with caution
Meta-analysis availableHuman trial evidenceTraditional useSafety cautionInteraction riskNeeds more research

Copper is an essential trace mineral involved in energy production, iron metabolism, and antioxidant defense, crucial for overall health.

Copper is an essential trace mineral vital for numerous physiological processes, including energy production, iron metabolism, connective tissue formation, and neurotransmitter synthesis. It plays a crucial role in maintaining the health of the nervous system, immune system, and cardiovascular system. Copper also acts as a cofactor for several enzymes, such as cytochrome c oxidase and superoxide dismutase, which are involved in cellular respiration and antioxidant defense, respectively. While necessary for health, both copper deficiency and excess can lead to adverse health effects, highlighting the importance of maintaining proper balance.

Quick answer

What it is: Copper is an essential trace mineral vital for numerous physiological processes, including energy production, iron metabolism, connective tissue formation, and neurotransmitter synthesis.

May support:Iron Deficiency Anemia, Zinc Deficiency, Osteoporosis

Evidence:Evidence · Grade D

Safety:Safety · Use with caution

Evidence Summary

Evidence · Grade D

Copper is an essential trace mineral with well-established roles in numerous physiological processes. Its importance in enzyme function, energy metabolism, and connective tissue formation is supported by extensive biochemical and physiological research. Evidence for its role in preventing and treating copper deficiency is strong. However, evidence for its use in specific ailments beyond deficiency correction, or for general supplementation in individuals with adequate intake, is less robust and often limited to observational studies or small clinical trials.

Last reviewed · Jun 2026

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Why It Works

Copper functions as a cofactor for various enzymes, facilitating electron transfer reactions, antioxidant defense, and the synthesis of connective tissue and neurotransmitters.

How it works in more detail

Copper is integral to the function of cuproenzymes, which catalyze diverse biochemical reactions. For example, cytochrome c oxidase, a copper-containing enzyme, is critical for cellular energy production in the mitochondria. Superoxide dismutase (SOD), another cuproenzyme, is a key antioxidant that protects cells from oxidative damage. Copper is also essential for lysyl oxidase, an enzyme involved in collagen and elastin cross-linking, which is vital for the integrity of connective tissues, bones, and blood vessels. Furthermore, copper plays a role in iron metabolism by facilitating the oxidation of iron, allowing its transport and utilization, and is involved in the synthesis of neurotransmitters like dopamine and norepinephrine.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
For adults, the recommended dietary allowance (RDA) is 0.9 mg per day. Supplemental doses typically range from 1 mg to 2 mg per day, often found in multivitamin/mineral supplements or as standalone copper supplements in forms like copper gluconate or copper bisglycinate.
Research dosage range
Typical dietary intake ranges from 0.9 mg to 2 mg per day. Studies investigating copper supplementation often use doses between 1 mg and 8 mg per day, depending on the condition and form of copper.
Typical onset
Effects of correcting a deficiency may be observed over weeks to months. General health maintenance is ongoing.
Typical forms
capsule, tablet, liquid
Quality markers
Look for reputable brands that provide third-party testing for purity and potency. Check for the specific form of copper, such as copper gluconate or copper bisglycinate, which are generally well-absorbed. Ensure the product states the elemental copper content.
Medication interactions
  • Zinc supplements
  • Iron supplements
  • Penicillamine
  • Tetracycline antibiotics
  • Antacids
Avoid if
  • Wilson's Disease
  • Copper toxicity
Pregnancy / lactation
Copper is essential during pregnancy and lactation, but intake should be within recommended dietary allowances. Excessive intake can be harmful to both mother and fetus/infant. Pregnant or lactating individuals should consult a healthcare professional before taking copper supplements.

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Suggested dosage

For adults, the recommended dietary allowance (RDA) is 0.9 mg per day. Supplemental doses typically range from 1 mg to 2 mg per day, often found in multivitamin/mineral supplements or as standalone copper supplements in forms like copper gluconate or copper bisglycinate.

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Copper (as a mineral element), various copper-containing enzymes (cuproenzymes).

Traditional use

Historically, copper has been used in various traditional medicine systems, often for its perceived antimicrobial properties or as a component in mineral-rich remedies. Ancient civilizations utilized copper for water purification and in topical applications for wounds. In some traditional practices, copper vessels were used for storing water, believed to impart health benefits. However, specific therapeutic uses for internal conditions were less defined compared to its role as an essential nutrient.

Safety

Safety warnings

Excessive copper intake can be toxic, leading to symptoms such as nausea, vomiting, abdominal pain, diarrhea, and in severe cases, liver damage, kidney damage, and neurological issues. Individuals with genetic disorders affecting copper metabolism, such as Wilson's disease, should strictly avoid copper supplementation unless under medical supervision. Long-term high-dose supplementation without a diagnosed deficiency is not recommended.

Avoid if

  • Wilson's Disease
  • Copper toxicity

Medication interactions

  • Zinc supplements
  • Iron supplements
  • Penicillamine
  • Tetracycline antibiotics
  • Antacids

Reported side effects

  • Nausea
  • Vomiting
  • Diarrhea
  • Abdominal pain
  • Headache
  • Dizziness

Pregnancy & lactation

Copper is essential during pregnancy and lactation, but intake should be within recommended dietary allowances. Excessive intake can be harmful to both mother and fetus/infant. Pregnant or lactating individuals should consult a healthcare professional before taking copper supplements.

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

Overall grade (D)

Copper is an essential trace mineral with well-established roles in numerous physiological processes. Its importance in enzyme function, energy metabolism, and connective tissue formation is supported by extensive biochemical and physiological research. Evidence for its role in preventing and treating copper deficiency is strong. However, evidence for its use in specific ailments beyond deficiency correction, or for general supplementation in individuals with adequate intake, is less robust and often limited to observational studies or small clinical trials.

Filter by source type

Meta-Analyses(1)

Pooled analyses across multiple human trials.

Very High Quality

  • Non-pharmacological interventions in the treatment of rheumatoid arthritis: A systematic review and meta-analysis.

    Turk MA, Liu Y, Pope JE · Autoimmunity reviews · 2023

    To investigate the role of non-pharmaceutical therapies on disease activity in rheumatoid arthritis through systematic review and meta-analysis. A review of Pubmed, EMBASE, Web of Science, and the Cochrane Library was performed from inception until March 26, 2019. Only randomized controlled trials which assessed oral, non-pharmacological interventions (e.g. diets, vitamins, oils, herbal remedies, fatty acids, supplements, etc.) in adult patients with rheumatoid arthritis, that presented clinically-relevant outcomes (defined as pain, fatigue, disability, joint counts, and/or disease indices) were included in our meta-analysis. Data were analyzed as mean differences between active and placebo and forest plots were performed. Heterogeneity was evaluated using I-squared statistics while funnel plots and Cochrane's risk of bias assessment evaluated bias. 8170 articles were identified in the search and 51 were RCTs were included. The mean difference in DAS28 was significantly improved in e

    Meta-AnalysisPubMedVery High Quality

Observational Studies(1)

Cohort, case-control, and cross-sectional human studies.

Moderate Quality

  • Role of zinc in health and disease.

    Stiles LI, Ferrao K, Mehta KJ · Clinical and experimental medicine · 2024

    This review provides a concise overview of the cellular and clinical aspects of the role of zinc, an essential micronutrient, in human physiology and discusses zinc-related pathological states. Zinc cannot be stored in significant amounts, so regular dietary intake is essential. ZIP4 and/or ZnT5B transport dietary zinc ions from the duodenum into the enterocyte, ZnT1 transports zinc ions from the enterocyte into the circulation, and ZnT5B (bidirectional zinc transporter) facilitates endogenous zinc secretion into the intestinal lumen. Putative promoters of zinc absorption that increase its bioavailability include amino acids released from protein digestion and citrate, whereas dietary phytates, casein and calcium can reduce zinc bioavailability. In circulation, 70% of zinc is bound to albumin, and the majority in the body is found in skeletal muscle and bone. Zinc excretion is via faeces (predominantly), urine, sweat, menstrual flow and semen. Excessive zinc intake can inhibit the

    Observational StudyPubMedLow Quality

Clinical Trial Registries(1)

Registered ongoing or completed trials (ClinicalTrials.gov).

Moderate Quality

  • The Effect of a New Antioxidant Combination (ASTED) on Mild Thyroid Eye Disease, a Placebo Controlled Randomized Clinical Trial

    NCT02393183 · WITHDRAWN · WITHDRAWN

    This randomized clinical trial is designed to evaluate the effect of selected antioxidant vitamins and minerals supplement named as ASTED: 1. β- Carotene (30 mg) 2. Vit C (100 mg) 3. Vit E (Alpha-Tocopherol Acetate): 60-200 IU 4. Calcium phosphate dihydrate (40 mg) 5. Zinc oxide (4 mg, elemental) 6. Copper gluconate (3.5 mg) 7. Sodium selenite 23 mg= Selenium 100 µg 8. Nicotinamide (a form of vit.B3) (10 mg) in patients with mild Thyroid eye disease according to EUGOGO classification. To be given twice a day.

    Clinical TrialClinicalTrials.govModerate Quality

Limitations: While copper's essentiality is clear, research on its therapeutic use for specific conditions often involves small sample sizes, short durations, or is confounded by other nutritional factors. The optimal balance of copper intake is narrow, and distinguishing between beneficial supplementation and potentially harmful excess can be challenging in research settings. Many studies focus on deficiency states rather than general health benefits in replete individuals.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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