In order to have a healthy functioning thyroid gland, you need to give your body the raw materials so it can actually make thyroid hormone. Being deficient in these key nutrients will never be fixed by medications. Make sure you are getting enough of the following: Vitamin A, Chromium, Vitamin D, Iodine, Iron, Vitamin B-12, Vitamin B-6, Vitamin B-2, Selenium, and Zinc. These are not in order of importance, all are necessary in their own way in producing thyroid hormone.