The body’s ability to resist infection and disease is hindered by long-term deficiency in essential vitamins and minerals. Importantly poor immune response is correlated with impaired thyroid function; a deficiency in iodine can greatly affect the immune system because low levels of iodine lead to problems with the thyroid gland.
In sufficient amounts iodine can not only adjust a dysfunctional thyroid, it can assist with a host of glandular imbalances as well as a wide assortment of internal as well as external bacteria, fungi, and virus’s. Iodine has many non-endocrine biologic effects, including the role it plays in the physiology of the inflammatory response. Iodides increase the movement of granulocytes into areas of inflammation and improve the phagocytosis of bacteria by granulocytes and the ability of granulocytes to kill bacteria.
Iodine’s ability to revive hormonal sensitivity seems to significantly improve insulin sensitivity. Iodine attaches to insulin receptors and improves glucose metabolism.
 Stone OJ (1988) The role of the primitive sea in the natural selection of iodides as a regulating factor in inflammation. Med Hypotheses. 25:125-129