Potassium Iodide is a chemical compound made up of potassium and iodine. It is often used as a dietary supplement to provide the body with iodine, which is essential for producing thyroid hormones. These hormones help regulate metabolism and are crucial for healthy growth and development. In emergency situations, such as a nuclear accident, Potassium Iodide can help protect the thyroid gland from absorbing harmful radioactive iodine. By saturating the thyroid with stable iodine, it reduces the risk of radiation-related health issues. This makes it an important tool in public health and safety during nuclear emergencies.