IOSAT™ Potassium Iodide received its approval from the FDA in 1982, and is the only full-strength tablet for radiation blocking which may legally be sold in the US. As a thyroid blocker for radiation, IOSAT has passed all FDA tests for purity, quality, safety and efficacy. It is used to protect your thyroid gland against radioactive iodine released during a nuclear emergency. It does this by flooding the thyroid with stable, safe iodine, which blocks the absorption of dangerous radioactive iodine. IOSAT™ is packaged whereby each 130 mg. tablet is individually foil sealed (not all thrown in a bottle), with 14 tablets per package. Dosage is one tablet per day, per adult, for up to 14 days, as instructed by public health authorities. If you live near a nuclear power plant or are concerned about a dirty bomb, you should keep these in stock. When they come over the radio and tell you to take your Potassium Iodide, it is too late to order it!