The best food sources of copper include organ meats, shellfish, nuts, seeds, and dark chocolate. Adults need 900 micrograms (mcg) of copper per day, and most people can meet that target with a varied diet. Copper plays a quiet but critical role in your body: it helps you form red blood cells, build collagen, produce energy, and maintain a healthy immune system.
How Much Copper You Need
The recommended daily amount varies by age and life stage. Adults 19 and older need 900 mcg per day, regardless of sex. Pregnant women need slightly more at 1,000 mcg, and breastfeeding women need 1,300 mcg. Children’s needs range from 340 mcg (ages 1 to 3) up to 890 mcg for teenagers. Infants get enough from breast milk alone, which provides roughly 200 to 220 mcg daily.
These numbers are small compared to minerals like calcium or magnesium, which means even modest servings of copper-rich foods can cover your daily requirement.
Nuts and Seeds
Cashews and sesame seeds are among the richest plant sources of copper. Cashews contain about 2.2 mg of copper per 100 grams, and sesame seeds come in even higher at roughly 2.3 mg per 100 grams. That means a single ounce of cashews (about 18 nuts) provides well over half your daily copper needs.
Other strong options in this category include sunflower seeds, almonds, hazelnuts, and walnuts. Nut butters retain this copper content, so a couple tablespoons of tahini (ground sesame paste) or cashew butter on toast is a simple way to boost your intake. Because nuts and seeds also deliver healthy fats, magnesium, and fiber, they’re doing a lot of nutritional work in a small package.
Organ Meats and Shellfish
Beef liver is one of the single most concentrated food sources of copper in the human diet. A small 3-ounce serving can deliver several times the daily recommendation, which is why it’s sometimes called a “nutrient powerhouse.” Other organ meats, like kidney and heart, are also rich in copper, though they’re less commonly eaten in Western diets.
Oysters are another standout. A serving of six medium oysters provides a substantial dose of copper alongside zinc, iron, and vitamin B12. Crab, lobster, and clams are also good shellfish sources, though they contain somewhat less copper than oysters.
Legumes and Whole Grains
Lentils, chickpeas, black beans, and other legumes are reliable copper sources, particularly for people who eat little or no meat. Cooked lentils provide a moderate amount per serving, and because legumes are typically eaten in generous portions (a full cup rather than a tablespoon), the copper adds up. White beans, navy beans, and soybeans all fall into the high-copper category as well.
Whole grains like quinoa, buckwheat, and whole wheat contribute meaningful amounts of copper too. Refined grains lose much of their mineral content during processing, so choosing whole grain bread, pasta, and cereals is a straightforward way to keep your copper intake higher.
Dark Chocolate
Dark chocolate with a high cocoa percentage (70% or above) is a surprisingly good source of copper. A one-ounce square typically provides a significant portion of the daily target. The copper comes from the cocoa itself, so milk chocolate, which contains far less cocoa, delivers much less. This is one of the more enjoyable ways to contribute to your copper intake, though it works best as a complement to other dietary sources rather than a primary one.
Other Notable Sources
Several everyday foods contribute moderate amounts of copper that add up over the course of a day:
- Potatoes: A medium baked potato with skin provides a useful amount of copper, and cooking with the skin on helps retain it.
- Mushrooms: Shiitake mushrooms are particularly rich, but common white and cremini varieties contribute copper as well.
- Leafy greens: Spinach, kale, and Swiss chard offer copper alongside iron and other minerals.
- Avocado: One whole avocado provides a moderate copper boost.
- Tofu and tempeh: Soy-based proteins retain much of the copper found in soybeans.
What Affects How Much Copper You Absorb
Not all the copper in your food makes it into your bloodstream. One of the most important interactions to know about is between copper and zinc. High zinc intake triggers your intestinal cells to produce a protein that traps copper inside the gut lining, preventing it from being absorbed into the body. This means that people taking high-dose zinc supplements (often marketed for immune support) can inadvertently lower their copper status over time. If you supplement with zinc regularly, it’s worth paying attention to your copper intake.
Cooking can actually help with copper absorption in some cases. Research on cooked versus raw foods found that overall copper bioavailability (the amount your body can actually use) was slightly higher in cooked foods than raw ones, averaging about 51% compared to 49%. More intense cooking methods like roasting and frying increased copper availability in vegetables more than boiling did. In cereals and grains, though, raw or minimally processed forms retained better copper availability than heavily cooked versions.
Why Copper Matters for Your Body
Copper is essential for forming red blood cells and keeping your immune system functioning. It’s a key player in collagen production, which means it supports the structure of your skin, bones, and connective tissue. It also helps your body use iron properly. Without enough copper, iron can’t be efficiently incorporated into red blood cells, which is why copper deficiency sometimes shows up as anemia that doesn’t respond to iron supplements.
Severe copper deficiency is uncommon in people eating a varied diet, but when it does occur, the consequences go beyond blood health. The most recognizable symptoms include anemia and a drop in white blood cells called neutrophils, which weakens your ability to fight infections. Neurological problems can also develop, including difficulty walking due to impaired coordination and tingling or numbness in the legs. These nerve-related symptoms stem from damage to the spinal cord and peripheral nerves. Replacing copper resolves the blood abnormalities quickly and completely, but neurological damage may only stabilize rather than fully reverse, which makes prevention far preferable to treatment.
People most at risk for deficiency include those who’ve had gastric bypass surgery (which reduces the absorptive surface of the gut), those on long-term high-dose zinc supplements, and people with malabsorption conditions.
Putting It Together
Meeting your daily copper needs doesn’t require exotic foods or careful meal planning. A diet that regularly includes a handful of cashews or other nuts, a serving of beans or lentils, whole grains, and the occasional piece of dark chocolate will comfortably cover the 900 mcg target for most adults. If you eat shellfish or organ meats even occasionally, you’re likely getting more than enough. The key is variety: because copper appears in moderate amounts across many food groups, eating a range of whole foods is the most reliable strategy.