Calcium iodide, represented by the chemical formula CaI2, is an inorganic compound made up of one calcium atom and two iodine atoms. It appears as a white or yellowish solid and is highly soluble in water. This compound is often used in various applications, including as a dietary supplement for iodine and in photography. In addition to its nutritional uses, CaI2 is also employed in the field of chemistry as a reagent and in the production of other iodine compounds. It can be found in some de-icing products due to its ability to lower the freezing point of water.