Iodized salt does prevent goiter
Refined salt has iodide added to it (0.01 percent) to help prevent goiter, but it does not provide enough iodine for optimal thyroid functioning as well as for the body's iodine needs. The final purity of refined salt is between 99.7-99.95 percent "pure." The "pure" refers to sodium and chloride content. The "impurities," including healthy minerals and elements, have been removed from refined salt.