In my country they tested commercial salts from the stores for iodine and the results were suprising. Mostly anything that wasnt in a hermetically sealed plastic bag had no iodine left. Also some had no iodine, maybe because manufacturers didnt even bother to add it, but in some it was discovered that it wasnt uniformly contained. So some packages from a manufacturer would be high,but most would be low. 11/16 samples had almost zero values.