Thyroid is the most important function in the body and all these diseases or having hyperthyroidism or hypothyroidism their is just one thing to it that the thyroid needs. IODINE. Many doctors today are saying that thyroid and Iodine together are very important because iodine builds thyroid hormone as the thyroid needs. They even have treated cancer patients by giving them the amount of iodine the body needs. Their are lots of information on how iodine is important and generally no one really focus on iodine which should.