Potassium iodide

Potassium iodide is an inorganic compound. It is less hygroscopic than sodium iodide, making it easier to work with. Aged and impure samples are yellow because of oxidation of the iodide to iodine.Potassium iodide is used medicinally in tablets, usually containing 130 mg of KI, or as a "saturated solution of potassium iodide" (SSKI) which in the U.S.P. generic formulation contains 1000 mg of KI per mL (or 500 mg KI in 10 drops, assumed to be 0.5 mL).

Potassium iodide is a supplement that manufacturers advertise as a way to treat an overactive thyroid in lieu of hormone therapies. It is also used to protect the person against the effects of inhaled or ingested radioactive iodine. You can get potassium iodide from numerous sources, but you should speak to your doctor before using the product.