The minerals are acquired by simply grinding up clay, rock, or other inorganic substances and then putting them into a tablet, pill or a colloidal-style liquid. The second way, and this is what we do, is to derive the minerals from plants. Plants that are grown in mineral rich soil have the ability to extract and store every mineral on the atomic chart. Another benefit of getting minerals from plants is that they don't need to be artificially broken down before they can be used by the body. One should never ingest a supplement that contains elemental nickel, lead, arsenic, iodine, aluminum, titanium and other such minerals due to the possibility of toxic build-up.
Most heavy metals are toxic to the body.
Certain heavier metals will attach themselves to bones and infuse themselves into the liver and kidneys. Go here for results from an independant lab.