Copper supplement causing nausea?

[answersfound]

i don't eat liver and I also don't eat shellfish a lot because it's expensive, so I supplement with zinc, copper, and selenium. The zinc and selenium don't give me any problems, but the copper from vitamin shoppe gives me nausea. I know Haidut got the same response so he stopped it. Why is this? Is there a particular form of copper that may not cause this? I only take it once a week, so I don't think it's any sort of toxicity. Any thoughts are appreciated. Thanks.