Copper
Copper is a trace mineral that plays a supporting role in a surprisingly wide range of processes — iron metabolism, energy production, connective tissue formation, immune function, and neurological health among them. The iron connection is particularly practical: copper is required for the body to properly absorb and use iron, which means that in cases of persistent iron deficiency that doesn’t respond well to dietary changes or supplementation, low copper status is sometimes part of the picture.
It’s also involved in the production of collagen and elastin — the proteins that give skin, blood vessels, and connective tissue their structure and flexibility — and in the activity of antioxidant enzymes that protect cells from oxidative damage.
Deficiency is uncommon in people eating a varied diet. Organ meats, shellfish — oysters in particular are exceptionally concentrated — nuts, seeds, and legumes are the richest sources. Where copper deficiency does occasionally appear is in people taking high-dose zinc supplements over an extended period, because zinc and copper compete for absorption and excess zinc can deplete copper stores over time. It’s a relevant consideration for anyone supplementing zinc at higher doses for an extended period.
Copper toxicity from food sources is essentially unheard of. Excess from supplements is possible but uncommon at typical supplemental doses.
Reference Card
Mineral type: Trace mineral Pillar: Nourish
What it does for you
- Essential for iron absorption and metabolism — copper deficiency can contribute to iron deficiency
- Supports energy production at the cellular level
- Required for collagen and elastin production — skin, blood vessels, connective tissue
- Supports immune function and antioxidant defense
Where to get it
- Oysters, beef liver, crab, cashews, sunflower seeds, dark chocolate, lentils, mushrooms
Considerations
- Deficiency is uncommon in people eating varied diets
- High-dose zinc supplementation over time can deplete copper — worth being aware of if supplementing zinc regularly
- Copper and iron work together — persistent iron deficiency that doesn’t resolve with dietary changes may involve copper status
Signs your intake might be low
- Fatigue and weakness
- Frequent illness or slow wound healing
- Neurological symptoms in more significant deficiency — rare but possible
Common myths
- Copper deficiency only happens in severely malnourished people — long-term high-dose zinc supplementation is a real and underrecognized cause of copper depletion in otherwise healthy people
- Copper is only relevant for older adults — it supports processes that matter at every age, particularly connective tissue integrity and iron metabolism