Copper

mineral
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Copper is involved in maintaining healthy bone, blood vessels, and connective tissues, while also supporting the formation of red blood cells. It serves as a cofactor for enzymes that facilitate energy production and the structural cross-linking of collagen and elastin. This mineral contributes to immune system function and provides antioxidant support by assisting the enzyme superoxide dismutase. It also plays a role in brain health and nerve function through its involvement in the synthesis of neurotransmitters. Effective iron metabolism relies on copper to help the body absorb and utilize iron. It assists in transporting iron for red blood cell production, making it important for energy levels and preventing certain types of deficiency.

Natural sources
Shellfish (oysters, crab, lobster)Nuts (cashews, almonds, peanuts)Seeds (sesame, sunflower)Whole grainsLegumes (lentils, beans)Dark chocolateOrgan meats (liver)MushroomsAvocado

Ingredient forms

No public comparison lists found.

Timing & Intake
AnytimeWith food
Taking copper with food may help reduce the risk of digestive upset.
Daily Intake
RDA (Men)1 mg
RDA (Women)1 mg
RDI1 mg
Optimal Dosage
Minimum1 mg
Maximum3 mg
Safety & Toxicity
Upper Limit (UL)10 mg
Toxicity Threshold60 mg
Toxicity EffectLiver damage, kidney failure
4 safety notes
  • Individuals with Wilson's disease, a genetic disorder causing copper accumulation, must avoid copper supplementation.
  • Do not exceed recommended doses, as excessive copper intake can be toxic and lead to adverse health effects.
  • Consult a healthcare professional before supplementing with copper, especially if pregnant, nursing, have a pre-existing medical condition, or are taking other medications.
  • Copper supplementation should be balanced with zinc intake, as high doses of one can affect the other's absorption.
Goals
Bone Health
Bone Health
Impact
High effect
Typical dose:1–3 mg
Copper's role via the enzyme lysyl oxidase is not just decent, but very effective and critical for creating a strong, flexible collagen framework in bone. Proper cross-linking is essential to prevent brittleness, making Copper's contribution high-impact for bone quality.

Study evidence

20 studies

Copper is needed for normal bone health, and deficiency can cause bone abnormalities. Dietary and blood-level studies show mixed relationships with bone density and fractures, so the available evidence does not establish that extra copper strengthens bones in people with adequate copper status.

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Skin Health
Skin Health
Impact
High effect
Typical dose:1–3 mg
Copper is required by the enzyme lysyl oxidase, which cross-links collagen and elastin fibers, giving skin its strength and elasticity. It also functions as a cofactor for the antioxidant enzyme superoxide dismutase. As a trace mineral, it is foundational but needed in small, balanced amounts, often alongside zinc.

Study evidence

16 studies

Copper is involved in skin repair, and copper-containing dressings and textiles have shown benefits for wound healing or skin appearance. These findings concern products applied to the skin and do not establish that taking extra copper improves skin health; occasional contact allergy is possible.

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Vision Support
Vision Support
Impact
High effect
Typical dose:1–2 mg
High-dose zinc supplementation, as recommended in the AREDS2 formula for vision support, can interfere with copper absorption and lead to a deficiency. Including a small amount of copper is not for direct vision benefits but is a crucial safety and efficacy measure to balance the zinc intake.

Study evidence

7 studies

Higher dietary copper intake is associated with lower risk of some age-related eye problems, but this does not prove that copper supplements improve vision. Benefits from multi-nutrient eye supplements cannot be assigned to copper alone, and blood-level findings are not uniformly favorable.

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Hair Health
Hair Health
Impact
Moderate effect
Typical dose:1–3 mg
Copper is a cofactor for enzymes involved in cross-linking collagen for hair follicle strength and producing melanin for hair color. While important, deficiency is uncommon and it must be carefully balanced with zinc intake, making it a supportive rather than a primary supplement for most people.

Study evidence

4 studies

Copper has not been shown to improve hair health through ordinary supplementation in the supplied evidence. Benefits involve medical treatment of a rare copper-handling disorder, while laboratory findings about copper-related hair damage concern copper on hair fibers rather than oral supplements.

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Studies

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Sources

Up to five highest-ranked published examples per goal. Study counts and charts include all published studies for the connection.

  1. The Association between Dietary and Circulating Copper Levels and Osteoporosis: a Scoping Review.
    Ju Y; Xiong W; Pang Y; Chen Z; Hou J; Zheng S; Li Z; Liu T; Xia H; Xia M; Zhong Y; Li J; Jiang X · Biological trace element research · 2026
    Scoping review18 studies pooledBone Health
  2. Association between dietary copper, iron, zinc, selenium intake and osteopenia or osteoporosis in elderly hypertensive patients: a retrospective cohort study.
    Chen M; Jia L; Gao R · Frontiers in nutrition · 2024
    Cohort study5,286 participantsBone Health
  3. Associations of dietary copper intake with total bone mineral density and lumbar spine bone mineral density in American adults.
    Hu M; Wang Z; Li C; Zheng Y; Hu J · Medicine · 2025
    Cross-sectional studyBone Health
  4. The association between dietary mineral intake and bone mineral density: a cross-sectional study.
    Wei M; Wei J; Huang S · Journal of health, population, and nutrition · 2025
    Cross-sectional study11,520 participantsBone Health
  5. Association between dietary copper intake and bone mineral density in children and adolescents aged 8-19 years: A cross-sectional study.
    Cui A; Yan J; Li H; Fan Z; Wei X; Wang H; Zhuang Y · PloS one · 2024
    Cross-sectional study6,965 participantsBone Health
  6. Noninferiority of Copper Dressings Than Negative Pressure Wound Therapy in Healing Diabetic Wounds: A Randomized Clinical Trial.
    Melamed E; Dabbah J; Israel T; Kan I; Pinzur MS; Roth T; Borkow G · Advances in wound care · 2026
    Randomized trialSkin Health
  7. Improvement of facial skin characteristics using copper oxide containing pillowcases: a double-blind, placebo-controlled, parallel, randomized study.
    Borkow G; Gabbay J; Lyakhovitsky A; Huszar M · International journal of cosmetic science · 2010
    Randomized trial57 participantsSkin Health
  8. Radially Electrospun Fibrous Membrane Incorporated with Copper Peroxide Nanodots Capable of Self-Catalyzed Chemodynamic Therapy for Angiogenesis and Healing Acceleration of Diabetic Wounds.
    Huang Y; Qi L; Liu Z; Jiang Y; Wang J; Liu L; Li Y; Zhang L; Feng G · ACS applied materials & interfaces · 2023
    Animal experimentSkin Health
  9. Engineering copper nanoparticle/polysaccharide-immobilized cotton gauze for accelerated healing of Staphylococcus aureus-infected dermal wounds.
    Sahoo M; Banerjee T; Virkar S; Das S; Biswas S; Mitra D · Journal of materials chemistry. B · 2026
    Animal experimentSkin Health
  10. Stimulation of Healing of Non-Infected Stagnated Diabetic Wounds by Copper Oxide-Impregnated Wound Dressings.
    Melamed E; Rovitsky A; Roth T; Assa L; Borkow G · Medicina (Kaunas, Lithuania) · 2021
    Single-arm trialSkin Health
  11. What did we learn in 35 years of research on nutrition and supplements for age-related macular degeneration: a systematic review.
    Pameijer EM; Heus P; Damen JAA; Spijker R; Hooft L; Ringens PJ; Imhof SM; van Leeuwen R · Acta ophthalmologica · 2023
    Systematic review27 studies pooledVision Support
  12. Dietary Nutrient Intake and Progression to Late Age-Related Macular Degeneration in the Age-Related Eye Disease Studies 1 and 2.
    Agrón E; Mares J; Clemons TE; Swaroop A; Chew EY; Keenan TDL; AREDS and AREDS2 Research Groups · Ophthalmology · 2021
    Cohort study8,242 participantsVision Support
  13. Association between late age-related macular degeneration and dietary intake of copper, iron, zinc and selenium: a 2005-2008 NHANES cross-sectional observational study.
    Lu Y; Li C; Liu Y; Wu T; Lu P · BMC ophthalmology · 2025
    Observational study4,996 participantsVision Support
  14. Associations between dietary nutrient intake and the risk of multiple age-related ocular diseases: evidence from longitudinal analysis.
    Yang Y; Zou H · The journal of nutrition, health & aging · 2026
    Cohort study103,192 participantsVision Support
  15. Dietary habits and dietary nutrient intake in patients with age-related macular degeneration: A case-control study.
    Šalková Kráľová J; Kolář P; Kapounová Z; Veselý P; Derflerová Brázdová Z · Central European journal of public health · 2023
    Case-control study151 participantsVision Support
  16. Menkes disease and response to copper histidine: An Indian case series.
    Yoganathan S; Sudhakar SV; Arunachal G; Thomas M; Subramanian A; George R; Danda S · Annals of Indian Academy of Neurology · 2022
    Case series4 participantsHair Health
  17. Trace element levels in alopecia areata.
    Bhat YJ; Manzoor S; Khan AR; Qayoom S · Indian journal of dermatology, venereology and leprology · 2009
    Case-control study100 participantsHair Health
  18. UV damage to hair and the effect of antioxidants and metal chelators.
    Millington KR; Marsh JM · International journal of cosmetic science · 2021
    In vitro / ex vivo studyHair Health
  19. Preserving fibre health: reducing oxidative stress throughout the life of the hair fibre.
    Marsh JM; Davis MG; Lucas RL; Reilman R; Styczynski PB; Li C; Mamak M; McComb DW; Williams RE; Godfrey S; Navqi KR; Chechik V · International journal of cosmetic science · 2016
    In vitro / ex vivo studyHair Health