Potassium Iodide is a potassium salt that is a source of the trace element iodine. Iodine is an integral constituent of thyroid hormones that help regulate certain reactions in the body, including protein synthesis and metabolic functions. Iodine may also play an important role in immune function. Products that contain Potassium Iodide: Daily Build (liquid and capsules) 360 Complete Shakes GPS Rebuild Chocolate, Vanilla, Strawberry and Vanilla Nutrition Shakes