there are heavy metal chelators available to the public that will remove mercury, lead and other heavy metals from the body. the ONLY way to do this orally is with a six month program. typically, every two years, i will go six months on, 18 months off.
"NAC is a chelator of heavy metals. In other words, NAC binds to toxic heavy metals such as mercury and lead, and removes them from the body. This can be a slow process, but most chelating agents, such as EDTA, must be given intravenously. NAC is one of the most effective oral chelating agents. (Alpha-Lipoic Acid is another effective agent.) Taken regularly over a period of time, NAC will remove many toxic heavy metals from the body. Toxic metals can accumulate in the body over time from many sources such as drinking water and possibly even from tooth fillings made of silver-mercury amalgam. "
http://www.nutriteam.com/cysteine.htm
http://www.futurescience.com/nac.html