Take Kanchanar in supplemental form daily. Kanchanar is often used in Ayurvedic medicine (a type of natural medicine in India) for the treatment of Goiter.
Take a B-Complex vitamin daily. Several of the B Vitamins nourish the thyroid gland and also help to utilize Iodine. B-Complex vitamins are usually used to help prevent Goiter, but have also been shown recently to improve the condition and its common symptoms.
Try doing a juice fast for a total of 1 week or 2 weeks. Though the exact reasoning is argued by different doctors, it has been proven that juice fasting can drastically improve Goiter and its symptoms. Even a shorter juice fast (3-5 days) can improve the condition to an extent, though doctors suggest juice fasting for at least 7 days.