Chelation therapy uses a medicine that binds to certain metals in the body. Once attached to the metal, the medicine helps carry it out of the body, mainly through the kidneys and urine. Different chelating medicines are used for different metals, so treatment is selected based on the specific metal involved and the individual's medical needs.
The body can naturally remove small amounts of many metals, but some metals can build up in the body or remain attached to tissues and proteins, particularly when exposure is significant. In these situations, the body's normal elimination processes may not be enough to remove the excess metal quickly or effectively. Chelation provides an additional mechanism by binding to the metal and helping the body eliminate it.
Sources: 1

