answer:I have hypo-thyroid, an under-functioning thyroid. It was discovered when I was 11 years old. Hypo-thyroidism runs in my family. I have been taking a thyroid hormone supplement ever since, and I have had no adverse side effects. Since the thyroid hormone occurs only in the thyroid, there are no natural treatments. This hormone does not occur anywhere else other than the thyroid. I’m 50 now, and I’m still taking a tiny pill of thyroid replacement hormone every morning without adverse effect.