The ambiguous terminology 'Iodine Prophylaxis' used for decades to provide iodine to the population for very different purposes as well as its replacement with 'Iodine Thyroid Blocking' is discussed and argued. Recommendations of international organisations regarding the action level for Iodine Thyroid Blocking and their implementation in national regulations in a few Member States of the European Union, and particularly in Hungary, is presented and discussed.
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