Hi Natural mom,
When you start iodine while being deficient, the body will raise TSH so it can stimulate cell to create the building of new NIS. NIS is needed to get iodine into the cell. When you were iodine deficient you lost your NIS because what you don't use, you lose.
The reaction of your body to iodine supplementation depends on the severity of the deficiency but also on the presence of bromide, fluoride and toxic metals.
Following orthoiodosupplementation, serum T4 and TSH levels usually go down and free T3 stays steady. I have seen TSH sometimes
go up rather than down while T4 and free T3 did not change or may have gone up some. This does not mean that the patient was
developing hypothyroidism but that the brain was stimulating the body to make more sodium iodide symporters (NIS)…. While taking
iodide, one may see an elevated TSH but we have to recognize that this is not a bad thing. TSH has many actions outside the thyroid
that have been discovered…. Often a check of the patient’s T4, free T3 and TSH shows the T4 to go down, free T3 going down and
TSH going up. Iodide is an essential nutrient that is absorbed by all cell lines. Its highest concentration is seen in the thyroid.
Hope this helps