Copper
Supplements · Minerals · Supplement, Typed Supps
Works as a pair with zinc — too much of one throws the other off.
Stage by stage
- Intake (Tablet): Absorbed in the stomach and upper small intestine via pathways shared with zinc.
- Small intestine (Shared pathway with zinc): Absorbed in the stomach and upper small intestine via pathways shared with zinc.
- Bloodstream (Bound to transport protein): Carried in blood bound to a dedicated transport protein.
- Enzymes (Iron metabolism, connective tissue): Used in enzymes involved in iron metabolism, connective tissue, and energy production.
What the evidence supports
- Correcting a documented deficiency — strong evidence. Clear — and the cause is usually worth finding, since long-term high-dose zinc is a common culprit.
- Improving general health in people who are not deficient — insufficient evidence. Dietary deficiency is rare, and excess copper carries its own problems.
Typical dose
Supplements and multivitamins generally supply somewhere between the requirement and a few milligrams. There is no established dose for taking copper beyond requirement, and correcting a diagnosed deficiency is a matter for a clinician rather than a shelf product.
Upper limit: 10 mg daily for adults, set to protect the liver. 10 mg daily as copper gluconate for 12 weeks produced no sign of toxicity in a controlled study; at the other end, a case report describes acute liver failure in someone who took 30 mg daily for two years and then more.
Timing
Take separately from high-dose zinc supplements.
Time to effect
- Weeks: Levels normalize with consistent intake.
Medication interactions
- Penicillamine and other chelators: These deliberately remove copper — supplementing works against them. (high)
- High-dose zinc: Blocks copper absorption. This is a supplement-supplement interaction rather than a drug one, and the reason copper is often added to zinc products. (moderate)
Common myth
“Copper deficiency isn’t something to worry about.” In reality: Long-term high-dose zinc supplementation is a well-documented cause of copper deficiency.
Food sources
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