Potassium Iodide (KI) is a dry salt-like tablet. Its chemical symbol is KI, which represents a compound of Potassium (K) and Iodine (I). Iodine is used by the thyroid gland to produce hormones. Iodine normally enters the bloodstream from the food we eat. The thyroid is designed to absorb and store Iodine.

KI is also added to table salt ("iodized salt") to provide a source of dietary Iodine.