Weak Rules on Toxins and Safety

Weak Rules on Toxins and Safety
http://www.nytimes.com/2010/03/31/business/economy/31leonhardt.html

"For 14 years until just last month, GlaxoSmithKline sold a denture cream called Super Poligrip that contained high levels of zinc.  The zinc helped with adhesion and was probably safe so long as people used moderate amounts of cream. Indeed, the human body needs small amounts of zinc to function. But some people ended up using much larger amounts, and they began to develop the kind of nerve damage associated with excess zinc."