Product Description In 1982, the FDA approved IOSAT potassium iodide tablets for blocking the thyroid's absorption of cancer-causing radioactive iodine (only the thyroid absorbs iodine). Saturate the thyroid with potassium iodide's stable iodine so it won't absorb radioactive iodine, the predominate radioisotope released from a nuclear reactor release or nuclear bomb fallout.
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