Some people claim that ionic copper is a poison. However ionic copper is easily taken up by albumin in the bloodstream. Ceruloplasmin is not the only copper-carrying enzyme in the blood.
Copper is taken up efficiently from albumin and α2-macroglobulin by cultured human cells by more than one mechanism
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2544443/
“Ionic copper entering blood plasma binds tightly to albumin and the macroglobulin transcuprein. It then goes primarily to the liver and kidney except in lactation, where a large portion goes directly to the mammary gland. Little is known about how this copper is taken up from these plasma proteins.”
The liver and kidney do not just “help the body excrete toxins”. They also are the location of the adrenal glands, which need copper to produce hormones and neurotransmitters, and the liver manufactures many copper enzymes.