Used primarily as a chelating agent to treat heavy metal poisoning, particularly arsenic, mercury, lead, and gold. It binds to toxic metals in the body, forming stable complexes that are then excreted primarily via urine, reducing their harmful effects. Also employed in industrial settings to stabilize certain polymers, as an antioxidant to prevent oxidation, and as a component in some chemical synthesis processes and lubricants. In research, it serves as a reducing agent to protect sensitive functional groups during reactions. Typically administered as an intramuscular injection for severe cases.