It is free of any heavy metal such as lead, cadmium, nickel or aluminum. Colloidal silver has been successfully tested at the UCLA medical labs where it killed every virus on which it was tested. Dr. Bjorn Nordstrom of Sweden's Karolinska Institute has used colloidal silver in his cancer cure methods for many years. He records that he has successfully cured patients who had been diagnosed by other doctors as terminally ill. While studying regeneration of limbs, spinal cords and organs in the late 70's, Robert becker, MD, author of The Body Electric , discovered that silver ions promote bone growth and kill surrounding bacteria.
Resistant strains fail to develop.
Moreover, colloidal silver is non-toxic.