Iodine is critical to proper gland functioning. According to Dr. Berry
"Iodine is a very important element. You will suffer if you don't have enough of it in your diet. Although some think it dangerous, iodine is actually essential to normal human life. Without enough of it you suffer, either a little or a lot. It's hard to get enough iodine in your diet, but it is essential to optimize thyroid function, and the function of numerous other glands. What is it and what does it do? Where does it come from and how much do you need?"