Copper picolinate

MineralCopperBest with a meal

What is it

Copper picolinate is a copper salt of picolinic acid, used as a supplement source of copper. Other common forms include copper gluconate, copper bisglycinate, and copper sulfate.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Copper deficiency / supplementation

Good Evidence

Copper supplements (including picolinate) effectively correct copper deficiency. Frank deficiency is uncommon in well-fed populations but can occur with excess zinc, bariatric surgery, or malabsorption.

How it works

Once dissolved in the stomach, copper picolinate releases copper ions that are absorbed in the small intestine. Picolinic acid is a tryptophan metabolite that may help shuttle minerals across the intestinal mucosa. Copper is essential for many enzymes, including those involved in iron metabolism (ceruloplasmin), energy production (cytochrome c oxidase), antioxidant defense (Cu/Zn superoxide dismutase), and connective tissue formation (lysyl oxidase). Picolinate-form minerals are sometimes marketed as having better absorption than other salts, though comparative data for copper are limited.

Dosage

RDA for copper: 900 mcg/day for adults (1300 mcg/day during pregnancy and breastfeeding). Tolerable Upper Intake Level: 10 mg/day for adults. Most supplements provide 0.5-2 mg copper. Check the elemental copper content, not the picolinate salt weight.

When and how to take it

Take with food to reduce stomach upset. Separate from zinc supplements by several hours to reduce competition. Daily consistency matters.

1 commercial form

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Copper picolinate

Less common than gluconate or bisglycinate; comparative absorption data for copper are limited.

Picolinic acid may assist mineral absorption.

Safety

Generally well tolerated at recommended doses. Excess copper can cause nausea, vomiting, and over the long term, liver damage. Copper imbalance with zinc is important: taking too much zinc can cause copper deficiency, and vice versa.

Who should be cautious

Avoid in Wilson's disease (copper overload condition). People taking high-dose zinc supplements should ensure adequate copper intake. Pregnant women should not exceed recommended doses. Children should not exceed age-specific recommendations.

Interactions

Zinc and copper compete for absorption; high doses of one can deplete the other. Iron also competes. Penicillamine and trientine (used in Wilson's disease) chelate copper.

Food sources

Beef liver, cooked

Amount
3 oz (85 g)
%DV
—

Oysters, cooked

Amount
3 oz (85 g)
%DV
—

Cashews, dry roasted

Amount
1 oz (28 g)
%DV
—

Dark chocolate

Amount
1 oz (28 g)
%DV
—

Frequently asked questions

Do I need a copper supplement if I take zinc?⌄

Long-term high-dose zinc (above 40 mg/day) can interfere with copper absorption and cause deficiency. Many multivitamins include both. If you take stand-alone high-dose zinc, copper supplementation (~1-2 mg/day) is often recommended.

Is copper picolinate better than other copper forms?⌄

There is no clear evidence that copper picolinate is better absorbed than copper gluconate, bisglycinate, or sulfate for most people. Pick a reputable brand and pay attention to elemental copper content.

References

Copper picolinate on Wikidata — Wikidata link

Copper picolinate (PubChem CID 14963587) — PubChem link

Copper picolinate on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Copper picolinate (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.