Here are some articles to support my claim and to refute your sarcastic comment. You pretty much didn't think about my concern.
There was nothing sarcastic in my previous post. It's just fact that earth is full of copper, brass and bronze, and copper is also
essential mineral for human health if you didn't know that and you can find it in all kind of food and supplements.
Copper is an essential trace element that is vital to the health of all living things
https://en.wikipedia.org/wiki/Copper_in_health