Copper Gluconate can be found in Certs breath mints. It is the last ingredient listed, but I thought it was worth mentioning because of the side effects reported.
http://en.m.wikipedia.org/wiki/Copper_gluconateQuote from Wiki:
Toxic in large amounts. Side effects from too much copper gluconate may include breathing problems, chest pain, stomach upset, and rash or hives.
What is considered "large amounts"? Two? Five? Twenty Certs?
My thoughts and
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Sass