There are various supplements for hypothyroidism and one of the most effective is iodine since it is a major component of the T3 as well as T4 hormones. Along with tyrosine, an important amino acid, iodine combines to boost the overall health of the thyroid glands. Deficiency of iodine results in a condition called hypothyroidism. Symptoms include extreme tiredness, weight gain, constipation, puffy eyes, dry skin, and heavy periods in women. Cases of iodine deficiencies are rare in the developed world since table salt that is used in most foods is fortified with iodine. Sea foods are a rich source of iodine. Some vegetables which are grown in rich soil also contain iodine. In case you cannot get the required dose of iodine from food, opt for oral iodine supplements such as pills. Take such supplements under the guidance of a certified medical practitioner. In the case of a person taking iodine supplements, thyroid hormone levels should be periodically analyzed to ascertain the duration for which the supplements need to be taken as well as the dosage, and it should be gradually stopped as the thyroid regains its normal function. While intake of iodine is beneficial, excessive intake of iodine can cause excessive production of thyroid hormones, thereby leading to hyperthyroidism.