If this trend continues, iodine deficiency diseases may become more common. Since the introduction of iodized salt, iodine supplements are unnecessary and not recommended for most people. The average diet provides about four times the recommended amount of iodine, which may result in health problems. In fact, goiter, traditionally a disease of iodine deficiency, is now linked sometimes to high iodine intake. Also, speculations of an iodine link to thyroid cancer have been reported.
Some people react to supplemental iodine, the first symptom of which is usually an acne-like rash.
At the time of writing, there were no well-known drug interactions with iodine. For the convenience of the reader, the information in the table listing the supplements for particular conditions is also categorized. Clinical uses of iodide and iodine. Hollowell JG, Staehling NW, Hannon WH, et al. Iodine nutrition in the United States.