Copper excess damages the liver. UL is 10 mg/day. High-dose zinc without copper also causes deficiency. Check the balance in your supplement stack.
Copper excess can cause liver and GI effects; rare with supplements unless very high doses.
| Standard | RDA | Upper Limit (UL) |
|---|---|---|
| United States | 900 mcg | 10000 mcg |
| European Union | 900 mcg | 10000 mcg |
| Australia | 900 mcg | 10000 mcg |
| China | 800 mcg | 8000 mcg |
| Japan | 900 mcg | 10000 mcg |
RDA = Recommended Dietary Allowance. UL = Tolerable Upper Intake Level. “Not established” does not mean unlimited intake is safe.
Yes. Copper toxicity is rare from diet alone but can occur from excessive supplementation. Symptoms include nausea, vomiting, diarrhea, and in severe cases, liver and kidney damage. The UL is 10 mg/day. High-dose zinc supplementation without copper can also cause problems by depleting copper.
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