In addition, maintaining normal or above-normal levels of thyroid hormone in the blood can help to reduce the amount of thyroid stimulating hormone (TSH) made by the pituitary gland. TSH is a regulatory hormone that stimulates the growth of the thyroid gland, and may also stimulate thyroid cancer cells. Normally, the pituitary gland makes more TSH when levels of thyroid hormone are low, so increasing these levels can send a signal to reduce production of thyroid stimulating hormone, and potentially help to keep some thyroid cancers from recurring.
Reference ranges for TSH may vary slightly, depending on the method of analysis, and do not necessarily equate to cut-offs for diagnosing thyroid dysfunction. In the UK, guidelines issued by the Association for Clinical Biochemistry suggest a reference range of - µIU/mL.  The National Academy of Clinical Biochemistry (NACB) stated that it expected the reference range for adults to be reduced to – µIU/mL, because research had shown that adults with an initially measured TSH level of over µIU/mL had "an increased odds ratio of developing hypothyroidism over the [following] 20 years, especially if thyroid antibodies were elevated". 
If you are currently taking a thyroid hormone like iodine tablets will actually reduce the amount of these products needed – or even eliminate them altogether!
As always, please make sure you consult with your physician and take regular thyroid blood level tests before changing any established routine.
But be warned! Prepare yourself for the shock, surprise (and even negativity) from your doctor… because they simply won't believe it’s possible!
If you’ve never started on thyroid hormone, then all the better. You won’t have to worry about what your doctor thinks. Just take the iodine supplement we’re recommending, and watch your symptoms disappear.