The purpose of this is to facilitate the removal of higher concentrations of heavy metals via the urinary tract than would normally occur from the body's natural detoxification processes. (drvitaminsolutions.com)
Be wary of high concentration in any of these because it exposes you to more risk. (getsmarteraboutmoney.ca)
Birds have been found with high concentrations of heavy metals in their tissues. (newscientist.com)