Most adults need 900 micrograms (mcg) of copper per day, and you can get that from a surprisingly short list of common foods. Shellfish, nuts, seeds, organ meats, whole grains, and even dark chocolate are all rich sources. The good news: unlike some minerals, copper from plant foods absorbs just as well as copper from animal foods, so virtually any eating pattern can cover your needs.
How Much Copper You Need
The recommended daily amount varies by age and life stage. Adults 19 and older need 900 mcg per day. Teenagers (14 to 18) need slightly less at 890 mcg. Children need progressively less: 700 mcg for ages 9 to 13, 440 mcg for ages 4 to 8, and 340 mcg for ages 1 to 3.
Pregnancy raises the requirement to 1,000 mcg regardless of age, and breastfeeding pushes it higher still to 1,300 mcg per day. For infants under 12 months, an adequate intake of 220 mcg is estimated, which breast milk or formula typically covers.
The Best Food Sources of Copper
A few foods stand far above the rest. A 3-ounce serving of pan-fried beef liver delivers a massive 12,400 mcg, more than 13 times the daily target. Three ounces of cooked wild eastern oysters provide 4,850 mcg. You don’t need to eat these regularly to meet your needs, but even a small serving once or twice a month makes a big dent.
For everyday meals, these foods each provide roughly 500 to 950 mcg per serving:
- Unsweetened baking chocolate (1 ounce): 938 mcg
- Potatoes with skin (1 medium): 675 mcg
- Shiitake mushrooms (½ cup cooked): 650 mcg
- Cashews (1 ounce, dry roasted): 629 mcg
- Dungeness crab (3 ounces cooked): 624 mcg
- Sunflower seeds (¼ cup toasted): 615 mcg
- Dark chocolate, 70%+ cacao (1 ounce): 501 mcg
Moderate sources that still contribute meaningfully include firm tofu (476 mcg per half cup), chickpeas (289 mcg per half cup), cooked millet (280 mcg per cup), and wild Atlantic salmon (273 mcg per 3 ounces). A single meal combining two or three of these foods can easily cover your full daily requirement.
Plant vs. Animal Sources: Absorption Is Similar
One of the more useful findings about copper is that your body absorbs it equally well from plant and animal foods. In absorption studies, copper from sunflower seeds, chickpeas, and peanuts was absorbed at about 39%, while copper from beef, shrimp, and chicken liver was absorbed at about 43%. That difference isn’t statistically meaningful. So if you’re vegetarian or vegan, you’re not at a disadvantage for copper the way you might be for iron or zinc.
Individual absorption rates vary by food: about 50% from cooked shrimp, 46% from sunflower seeds, 41% from peanuts, and 40% from cooked beef. These are all solid numbers. For practical purposes, you can trust the mcg values on nutrition labels without worrying that your body won’t absorb them.
Why Your Body Needs Copper
Copper plays a quiet but essential role in several body systems. Its most important job may be helping you use iron properly. Copper-dependent proteins are required to move iron out of your intestinal cells and into your bloodstream after you absorb it from food. Without enough copper, iron can get trapped in your gut lining and liver, leading to a functional iron deficiency even when your iron intake is adequate. This is why unexplained anemia sometimes turns out to be a copper problem, not an iron problem.
Copper is also embedded in the machinery your cells use to produce energy. Inside mitochondria, a key step in converting food into usable energy requires two copper atoms. This is part of why fatigue can be an early sign of deficiency. In the brain, copper helps regulate iron levels in a way that supports normal nerve function. When copper is missing, iron accumulates in brain tissue in patterns associated with neurological damage.
Signs of Copper Deficiency
True copper deficiency is uncommon in people eating a varied diet, but it does happen, particularly after gastric surgery, in people with chronic digestive conditions that impair absorption, or in those taking high doses of zinc supplements over time (since zinc competes with copper for absorption in the gut).
The earliest signs are often in blood work: anemia and low white blood cell counts appear in roughly 78% of deficiency cases. These can be mistaken for other conditions, and copper deficiency has historically been misdiagnosed as a bone marrow disorder.
If deficiency persists, neurological symptoms develop. The pattern closely resembles vitamin B12 deficiency: difficulty walking due to impaired sensation in the legs, tingling or numbness in the hands and feet, and sometimes spasticity. Cognitive changes and vision problems have also been reported, though less commonly. The walking difficulties arise because copper deficiency damages the same spinal cord pathways that B12 deficiency targets. This means if you’re being evaluated for B12 deficiency but your levels are normal, copper is worth checking.
Zinc and Copper: A Balancing Act
Copper, zinc, and iron all compete for absorption in your intestines. The most clinically relevant interaction is between zinc and copper. High-dose zinc supplements (often taken for immune support or acne) can block copper absorption over time, gradually depleting your stores. This is the most common cause of acquired copper deficiency in people who aren’t post-surgical. If you regularly take zinc above the standard recommended amount, it’s worth being aware of this interaction.
From food alone, this competition rarely causes problems. The amounts of zinc in a normal diet aren’t concentrated enough to meaningfully block copper uptake. The issue arises with supplemental doses.
Practical Ways to Boost Your Intake
You don’t need to overhaul your diet. A few small additions can reliably push you past the 900 mcg target:
- Snack on cashews or sunflower seeds. A single ounce of cashews or a quarter cup of sunflower seeds gives you about 70% of your daily need.
- Eat potatoes with the skin on. One medium potato with skin provides 675 mcg. Peeling removes a significant portion of the mineral content.
- Add mushrooms to meals. Half a cup of cooked shiitake mushrooms contributes 650 mcg. Other mushroom varieties contain copper too, though generally less.
- Choose dark chocolate. An ounce of dark chocolate (70% cacao or higher) provides 501 mcg. This is one mineral where dessert genuinely helps.
- Include legumes regularly. Half a cup of chickpeas adds 289 mcg. Lentils and other beans contribute similar amounts.
Whole grains, especially wheat bran cereals and millet, are another easy source that adds up across the day. If you eat seafood, wild salmon at dinner and a handful of cashews as a snack essentially covers you.
A Note on Copper Cookware
Unlined copper pots can leach copper into food, but the amount depends heavily on what you’re cooking. Acidic foods (anything with vinegar, citrus, or tomatoes) pull the most copper from the surface. In lab testing, boiling an acidic solution in new copper cookware released about 10 mg of copper per liter, while neutral water released almost nothing (0.06 mg per liter). Most modern copper cookware is lined with stainless steel or tin specifically to prevent this. If you use unlined copper for acidic dishes, you could be getting a significant and unpredictable amount of extra copper, which isn’t ideal since the tolerable upper limit for adults is 10,000 mcg (10 mg) per day. Lined cookware eliminates the concern.