Cadmium, according to Wikipedia: "has no constructive purpose in the human body. This element and solutions of its compounds are toxic even in low concentrations, and will bioaccumulate in organisms and ecosystems."
Thallium. In the news a lot lately as a suspect in the the recent poisoning in the UK of ex-KGB agent Alexander Litvinenko. According to the venerable BBC Thallium can "...attack the nervous system and internal organs... also cause hair loss, vomiting, and diarrhoea."
A Xooma website (Xooma does very much appear as a 'get rich quick from home' kinda organisation so pinning down the real home of Xooma isn't that straight forward) says their product has these qualities:
- Cleanse the kidneys, intestines, and liver
- Protect your body from free radical cell damage