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Confidence level
Strong evidence
488 studies

Copper

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Absorption
Take with food to enhance absorption. Avoid taking with zinc supplements, as they can interfere with copper absorption.
Daily Dose
Common dose: 1-3 mg daily
RDA: 900 mcg
Upper limit: 10,000 mcg (10 mg)
Best form: Copper gluconate, copper bisglycinate
Timing: With or without food
Copper excess can lead to toxicity; deficiency is rare. Balance with zinc supplementation to avoid imbalance.
Food Sources
  • Beef liver14mg per 100g
  • Oysters7.6mg per 100g
  • Dark chocolate (70%+)1.8mg per 28g
  • Cashew nuts2.2mg per 100g
  • Sunflower seeds1.8mg per 100g

Not medical advice