Fatigue, weight gain, depression, constipation — these are just a few of the more common symptoms of the dysfunction of the thyroid, a little gland that exerts an enormous influence over the entire body. Dr. David Brownstein, one of the foremost practitioners of holistic medicine, has been studying the true causes of thyroid dysfunction over two decades. His revolutionary treatment plan, with the use of iodine supplementation at its core, has effectively helped thousands of patients to date. Dr. Brownstein describes in detail how the thyroid functions, the role of iodine, and its common disorders — including thyroid cancer, which is the fastest growing cancer in the U.S. right now.