I'm aware that plasma zinc and copper should be in about 1:1 ratio. Zinc is excreted but copper bioaccumulates. I use zinc acetate lozenges to fight off an oncoming cold (off topic, but my n=1 is it works if I start when I first notice a scratchy throat). I've been concerned about taking too much zinc, and so have been balancing with about a tenth of copper. Might be time to either stop that or get a blood test the next time I do that. Thought I had that figured out but maybe not... Thanks!