Copper RDA Table
| Life stage | RDA (mcg/day) |
|---|---|
| Infant 0–6 mo | 200 (AI) |
| Infant 7–12 mo | 220 (AI) |
| 1–3 years | 340 |
| 4–8 years | 440 |
| 9–13 years | 700 |
| 14–18 years | 890 |
| 19+ years | 900 |
| Pregnancy | 1,000 |
| Lactation | 1,300 |
| Upper limit, adult | 10,000 (10 mg) |
| Food | Portion | mcg | %DV |
|---|---|---|---|
| Beef liver, pan-fried | 3 oz | 12,415 | 1,379% |
| Oysters, eastern, cooked | 3 oz | 4,850 | 539% |
| Crab, Alaska king | 3 oz | 980 | 109% |
| Shiitake mushrooms | 1/2 cup | 650 | 72% |
| Cashews, dry-roasted | 1 oz | 622 | 69% |
| Sunflower seeds | 1 oz | 519 | 58% |
| Dark chocolate, 70-85% | 1 oz | 495 | 55% |
| Potato, medium, baked | 1 | 371 | 41% |
Copper owns the two most extreme rows on this entire family of tables: a single 3-ounce serving of beef liver carries 12,415 mcg - 1,379% of the Daily Value, more than thirteen days of the adult RDA in one plate - and oysters follow at 539%. Below those two, the table settles into a friendly pattern: crab, shiitake mushrooms, cashews, sunflower seeds and dark chocolate all deliver half a day in modest servings, which is why copper deficiency in a normal diet is nearly a myth.
The mineral's real story is its trade with zinc: both compete for absorption in the gut, so chronic zinc megadosing - the 40+ mg lozenge-and-'immune support' habit - quietly starves copper and produces an anemia that iron pills cannot fix, plus low white cells and bone changes. This is the mirror image of the zinc table's ceiling: the same supplement aisle habit, read from the other mineral's page.
The clinical corners are genetic and absolute: Wilson disease makes the body hoard copper until it poisons the liver and brain (treated for life with chelation and a low-copper plate), Menkes disease does the opposite in infants, and the adult ceiling of 10 mg a day - more than any food habit reaches - exists to protect the liver from supplement-grade chronic dosing.
How to use
- Find your row: 900 mcg for men and women from 19; 890 for teens 14-18; 700 at 9-13; 440 at 4-8 and 340 at 1-3; 200-220 mcg AI in infancy; pregnancy 1,000 and breastfeeding 1,300 - the largest relative bump in the mineral family.
- Clear it without thinking: a handful of cashews (622 mcg) or sunflower seeds (519), a cup of chickpeas or shiitake mushrooms (650), or a square or two of dark chocolate (495 per ounce) - any diet with nuts, seeds, legumes or shellfish meets 900 mcg before dinner.
- Read the supplement shelf in pairs: any chronic zinc supplement above roughly 40 mg a day needs a copper question attached - the anemia it causes looks like iron deficiency, responds to nothing but copper, and hides behind 'immune support' labels; and if a doctor has ever flagged unexplained anemia with low neutrophils, copper status is one of the standard next checks.
Frequently asked questions
How much copper do I need per day?
The NIH RDA is 900 mcg for men and women from 19; teens 14-18 need 890; children 340-700 mcg; infants 200-220 as AIs. Pregnancy needs 1,000 mcg and breastfeeding 1,300 - a 44% jump over the adult RDA. The Daily Value on labels is 900 mcg. The ceiling (UL) is 10,000 mcg (10 mg) a day for adults, set to protect the liver from chronic supplement-grade doses.
What foods are highest in copper?
Beef liver is the wildest row on the site: 12,415 mcg per 3 ounces (1,379% DV). Oysters follow at 4,850 (539%), then the daily shelf: Alaska king crab 980 per 3 ounces (109%), shiitake mushrooms 650 per half cup (72%), cashews 622 per ounce (69%), chickpeas, sunflower seeds 519 (58%), dark chocolate 70-85% at 495 per ounce (55%), and potatoes at 371 each (41%). Shellfish, nuts, seeds, legumes and chocolate - a normal omnivore or even a plant-based eater meets 900 mcg easily; deficiency belongs to malabsorption and zinc abuse, not to menu choices.
Can too much zinc cause copper deficiency?
Yes - this is the documented mechanism behind the zinc table's 40 mg ceiling. Zinc and copper compete for the same intestinal absorption machinery, so chronic high-dose zinc (lozenges, 'immune support' megadoses, galvanized-welders' exposure) gradually starves copper and produces a anemia with low neutrophils that iron supplements do not touch, sometimes with bone and nerve changes. The fix is stopping the zinc, not adding iron; regular copper-free zinc use above the UL is the classic case report in hematology.
What is Wilson disease - and should I limit dietary copper?
Wilson disease is a rare inherited disorder (about 1 in 30,000) where the body cannot excrete copper, so it accumulates in the liver and brain - causing hepatitis, tremor, speech changes and psychiatric symptoms, usually in teens and young adults. It is treated for life with chelation therapy and a lower-copper diet. For everyone else, dietary copper at normal intake needs no restriction: the body regulates absorption and excretion tightly, and the 10 mg UL is only reachable by supplements, not by any food habit.
What are the signs of copper deficiency or excess?
Deficiency (rare, mostly zinc-induced or malabsorption): anemia that iron fails to fix, low white-cell count, bone fragility, and in severe cases nerve symptoms that mimic B12 deficiency. Excess is almost always genetic (Wilson) or supplement-grade: acute doses cause nausea and vomiting quickly - copper is a noted emetic - and chronic intake near or above the 10 mg UL damages the liver. Both ends of this table are clinical findings, not everyday diet problems.