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    Copper

    Also known as: Cu, Cupric ion, Copper sulfate, Copper-histidine

    Randomized trials and a small meta-analysis of oral copper supplementation (commonly 3–8 mg/day for weeks to months) report no consistent effects on total cholesterol, LDL-C, HDL-C or susceptibility of LDL to in vitro oxidation. Disease-specific evidence (for Menkes disease) concerns parenteral copper in newborns and is not relevant to routine oral supplementation.

    Last reviewed: 2026-10-14 · 3 indexed studies

    Evidence Score
    40/100
    Dietary copper replacementGeneral mineral supplementationSupport of enzymatic copper-dependent processes
    Data Completeness4/4 · 100%
    Evidence ScoreDosageSafetyLinked Studies

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    Overview

    Copper is an essential trace mineral and a cofactor for enzymes involved in redox reactions, iron metabolism and connective tissue formation. Clinical trials of oral copper supplementation in generally healthy adults have mostly failed to show clear benefits on blood lipids or LDL oxidisability at the doses studied.

    Mechanism & Function

    Mechanism of Action

    Copper acts as a cofactor for several enzymes (for example ceruloplasmin, cytochrome c oxidase and superoxide dismutase) that participate in oxidative metabolism, iron handling and antioxidant defence. These biochemical roles provide a plausible mechanism by which copper status could influence lipid metabolism and oxidative processes, but randomized trials included here do not show consistent clinical effects on measured lipid endpoints.

    Physiological Role

    Cofactor for oxidoreductases and enzymes involved in iron transport, mitochondrial respiration and connective tissue cross-linking; contributes to antioxidant enzyme function.

    Primary Pathways

    Copper-dependent oxidoreductasesIron metabolism/ceruloplasmin activityAntioxidant defence (SOD)

    Performance / Health Relevance

    There is biological plausibility that copper status could affect metabolism and oxidative stress, but available RCT evidence in generally healthy adults does not support meaningful effects on blood lipid markers or LDL oxidisability at the studied oral doses.

    Evidence Review

    Overall40/100
    Human Clinical33/100
    Meta-Analysis37/100
    Mechanistic45/100
    Real-World26/100
    Safety70/100

    Practical Use & Dosage

    Minimum Effective Dose
    Not established (no consistent clinical benefit demonstrated in RCTs)
    Optimal Range
    Not established
    Upper / Caution Level
    Tolerable Upper Intake Level (UL) for adults generally listed as 10 mg/day (authoritative guidance)
    Timing
    No evidence from provided trials to support specific timing
    Best Format
    Oral forms commonly studied include copper sulfate and copper salts; copper-histidine is used parenterally in Menkes disease but is not relevant to routine oral supplementation
    Bioavailability
    Bioavailability varies with form and dietary factors; not detailed in the provided abstracts
    Absorption Considerations
    Absorption can be affected by dietary zinc and other factors, but specifics are not reported in the supplied abstracts

    Safety & Interactions

    Side Effects

    • •No treatment-related liver enzyme changes reported in the included RCT (up to 8 mg/day over 6 months)
    • •High intakes can cause gastrointestinal upset or copper toxicity (not observed in the provided RCTs)

    Contraindications

    • Wilson's disease (copper accumulation disorders) — avoid supplemental copper

    Drug Interactions

    • •High-dose zinc can interfere with copper absorption (general knowledge; not detailed in the provided abstracts)

    Who Should Avoid

    • •People with Wilson's disease or other copper overload disorders

    Monitoring

    If chronic supplementation is used near the upper intake level, consider monitoring for symptoms of excess and measuring copper/ceruloplasmin if clinically indicated.

    Frequently Asked Questions

    Auto-generated from indexed evidence — dosage, safety, interactions, and more.

    When is Copper typically used or indicated?

    Copper is most commonly used for: Dietary copper replacement, General mineral supplementation, Support of enzymatic copper-dependent processes. Cofactor for oxidoreductases and enzymes involved in iron transport, mitochondrial respiration and connective tissue cross-linking; contributes to antioxidant enzyme function.

    How does Copper work?

    Copper acts as a cofactor for several enzymes (for example ceruloplasmin, cytochrome c oxidase and superoxide dismutase) that participate in oxidative metabolism, iron handling and antioxidant defence. These biochemical roles provide a plausible mechanism by which copper status could influence lipid metabolism and oxidative processes, but randomized trials included here do not show consistent clinical effects on measured lipid endpoints.

    What is the recommended dose of Copper?

    The optimal range is Not established. with a minimum effective dose of Not established (no consistent clinical benefit demonstrated in RCTs). Best taken: No evidence from provided trials to support specific timing. Upper / caution level: Tolerable Upper Intake Level (UL) for adults generally listed as 10 mg/day (authoritative guidance).

    What are the side effects of Copper?

    Reported side effects include: No treatment-related liver enzyme changes reported in the included RCT (up to 8 mg/day over 6 months); and High intakes can cause gastrointestinal upset or copper toxicity (not observed in the provided RCTs). Monitoring: If chronic supplementation is used near the upper intake level, consider monitoring for symptoms of excess and measuring copper/ceruloplasmin if clinically indicated.

    Does Copper interact with medications?

    Known or theoretical interactions: High-dose zinc can interfere with copper absorption (general knowledge; not detailed in the provided abstracts). Always check with a clinician before combining with prescription medication.

    Who should avoid Copper?

    Copper is generally not recommended for: People with Wilson's disease or other copper overload disorders; and Wilson's disease (copper accumulation disorders) — avoid supplemental copper.

    How strong is the evidence for Copper?

    Evidence level: Limited (overall score 40/100), based on 3 indexed studies on SuppIndex.

    Research & References (3)

    Effects of Copper Supplementation on Blood Lipid Level: a Systematic Review and a Meta-Analysis on Randomized Clinical Trials.

    Meta-Analysis2021
    PubMed

    Systematic review and meta-analysis of randomized clinical trials examining effects of oral copper supplementation on blood lipid levels. Data from 5 trials (176 participants) were pooled.

    Copper supplementation at 8 mg neither affects circulating lipids nor liver function in apparently healthy Chilean men.

    RCT2013
    PubMed

    Randomized double-blind placebo-controlled trial in 60 apparently healthy Chilean men assessing 8 mg Cu/day (as copper sulfate) for 6 months on lipid profile and liver function.

    Copper supplementation in humans does not affect the susceptibility of low density lipoprotein to in vitro induced oxidation (FOODCUE project).

    RCT2000
    PubMed

    Multicentre European trial (FOODCUE) studied effects of dietary copper supplementation (3 or 6 mg/day on top of normal intakes or controlled diets) on LDL susceptibility to in vitro-induced oxidation in apparently healthy volunteers.

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    75/100

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    Zinc

    74/100

    Systematic reviews and meta-analyses of human trials show that oral zinc supplementation reduces duration and increases recovery rates in acute and persistent watery diarrhoea in children; lowers inflammatory lesion counts in acne; reduces pain severity in primary dysmenorrhea; and in small trials (20–30 mg/day) improved fasting glucose and 2‑hr OGTT in people with prediabetes. Adverse effects reported include increased vomiting in children receiving zinc for diarrhoea.

    Research Overview

    Limited Evidence
    3Total Studies
    2Human Trials
    1Meta-Analyses
    2021Latest Study
    0Animal / In Vitro
    0Athlete Studies
    Primary data sourceGeneral Population
    Pooled evidence (meta-analysis / systematic review)Yes

    Cite this ingredient

    One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.

    Stable URL

    https://thesuppindex.com/ingredients/copper

    SuppIndex. (2026). Copper: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/copper

    Based on 3 indexed studies · Evidence level: Limited.

    Goal Ratings

    General Health
    Metabolic Health

    Stack Compatibility

    Concurrent high-dose zinc may reduce copper absorption; consider balancing trace mineral supplementation accordingly.

    Not applicable beyond general caution about high-dose zinc