High supplemental zinc can affect copper status. Review the combined label dose against a verified formal regional UL and ask about long-term use.
High zinc long-term can impair copper absorption and immune function.
| Standard | RDA | Upper Limit (UL) |
|---|---|---|
| United States | 11 mg | 40 mg |
| European Union | 11 mg | 40 mg |
| Australia | 11 mg | 40 mg |
| China | 12.5 mg | 40 mg |
| Japan | 10 mg | 40 mg |
RDA = Recommended Dietary Allowance. UL = Tolerable Upper Intake Level. “Not established” does not mean unlimited intake is safe.
Short-term: nausea, vomiting, loss of appetite, and stomach cramps. Long-term: copper deficiency, anemia, weakened immunity, and lowered "good" HDL cholesterol. The UL is 40 mg/day. Taking more than 50 mg/day long-term without copper supplementation is risky.
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