DMPS (Dimercaptopropane Sulfonate or 2,3-Dimercaptopropane Sulfonic Acid) is a sulfur-based, water-soluble chemical chelation agent. DMPS has been used for decades in Europe as a treatment for heavy metal intoxication and although primarily used as a chelator for mercury toxicity, it seems to have an affinity for pulling out various other metals (both harmful and helpful) as well. Available as a finished drug in Europe, DMPS is only available in the United States as a bulk chemical to be compounded by a pharmacist when (and only when) prescribed by a physician. Due to safety concerns and other risk factors, DMPS has not been approved by the Food and Drug Administration (FDA) and as such is still being researched and tested.