A lot of people are scared of the Colloidal Gold and Colloidal Silver because it is a "heavy metal" yet with the highest qualities of CS and CG like @gardenofeden carries there are no possibilities for any heavy metal build up.
Also when taking a high quality iodine supplement like @gardenofeden offers even if there was its very easy to detox out of the body.
It is the ionic energy of the CS and CG where the real medicine is not in the heavy metal particles them selfs.