MPP+ is commonly sold as the water-soluble iodide salt and is a white-to-beige powder.[13] Specific toxicological data on the compound is somewhat lacking, but one MSDS quotes an LD50 of 29 mg/kg via an intraperitoneal route and 22.3 mg/kg via a subcutaneous route of exposure.[14] Both values come from a mouse model system.[14]