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Potassium iodide, chemically denoted as KI, is an iodine supplement primarily utilized for its ability to safeguard the thyroid gland from radioactive iodine exposure. During a nuclear incident, radioactive iodine can be released into the atmosphere, posing severe health risks upon inhalation or ingestion. The thyroid gland, responsible for hormone production that regulates vital bodily functions, tends to absorb iodine readily. Administering non-radioactive potassium iodide saturates the thyroid, effectively preventing it from absorbing harmful radioactive iodine.