Iodine is the most necessary part of our body to produce the thyroid hormone. Our body does not make iodine automatically but the human body needs it to get it. Otherwise, you can’t make enough thyroid hormone. Many people face many problems because of the deficiency of thyroid hormone in their bodies such as it deficiency results into an enlargement of the thyroid (goiter), hypothyroidism, and paralysis in infants, disabilities of body parts of children whose mother is the victim of lack of iodine in the pregnancy period.
Source : https://www.webpressglobal.com/health/iodine-health-benefits-importance-side-effects-uses/