https://lpi.oregonstate.edu/mic/minerals/copper#:~:text=High%20supplemental%20zinc%20intakes%20of,trapping%20them%20in%20intestinal%20cells.

High supplemental zinc intakes of 50 mg/day or more for extended periods of time may result in copper deficiency. High dietary zinc intakes increase the synthesis of an intestinal cell protein called metallothionein, which binds certain metals and prevents their absorption by trapping them in intestinal cells.