Copper ascorbate

MineralBest with a meal

What is it

Copper ascorbate is a salt that delivers both elemental copper and ascorbate (vitamin C) and is used as a copper source in some multivitamin and mineral supplements.

Evidence for 1 use

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

Correcting/preventing copper deficiency

Good Evidence

Supplemental copper salts reliably raise copper status in deficient individuals. Copper ascorbate has not been shown to be superior to other common copper salts for this purpose.

How it works

Once dissolved, copper ascorbate dissociates into copper ions and ascorbate. Copper supports activities of cuproenzymes involved in iron metabolism, connective tissue formation, antioxidant defense (e.g., superoxide dismutase), and neurotransmitter synthesis. Ascorbate contributes vitamin C activity and may influence copper redox cycling in the gut. High-dose vitamin C can paradoxically reduce copper absorption in some studies, so the net copper bioavailability from this specific salt is not better established than from sulfate or gluconate.

Dosage

Adult RDA for copper is 900 mcg/day; UL is 10 mg/day from all sources. Supplemental copper in multis typically falls between 0.5-2 mg. DSLD does not provide a median dose specifically for copper ascorbate.

When and how to take it

Take with food to reduce GI upset. Separate from high-dose zinc and iron supplements by at least 2 hours.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Copper ascorbate

Provides copper plus a small amount of vitamin C in one ingredient.

Soluble copper salt; net absorption is similar to other common copper salts and is influenced by zinc, iron, and other dietary factors.

Safety

Excess copper can cause nausea, vomiting, abdominal pain, and at chronic high doses, liver damage. Stay below the 10 mg/day UL unless directed by a clinician.

Who should be cautious

Avoid supplemental copper in Wilson's disease and other copper-overload states. Caution in liver disease. People taking long-term zinc (e.g., >40 mg/day) should monitor copper status.

Interactions

Zinc, iron, and high-dose vitamin C can affect copper absorption. Long-term high-dose zinc supplementation is the most clinically important interaction and can induce copper deficiency.

Food sources

Beef liver

Amount
3 oz
%DV
—

Oysters

Amount
3 oz
%DV
—

Cashews

Amount
1 oz
%DV
—

Frequently asked questions

Is copper ascorbate better than copper gluconate?⌄

There is no strong evidence that one common copper salt is meaningfully better absorbed than another in healthy adults.

How much copper do I need from a supplement?⌄

The RDA is 900 mcg/day; most healthy adults eating a varied diet do not need a separate copper supplement.

References

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

Research on Copper ascorbate (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.