premise: How to take iodine<br>Choose an iodine supplement of 0.5 milligrams or less. If you think you aren't getting enough iodine and you don't want to visit the doctor, take a low dose of iodine. You shouldn't take more than 0.5 milligrams a day, as too much iodine can wreak havoc on your thyroid gland.
hypothesis: The person writing these instructions would agree that a 50 milligram iodine supplement would not be good for one's thyroid gland. 
reason: He says taking any more than 0.5 milligrams would "wreak havoc" on the thyroid, and 50 milligrams is 100 times more than that. 