Iodine is an essential nutrient, meaning that we do not produce it internally and we have to get it from our food. Unfortunately, our soil is depleted of this vital nutrient and the only effective way to make sure that you are getting enough iodine is by taking a nutrient supplement. Iodine is essential for the health of our thyroids, breasts, uterus, ovaries and prostates. Riordan Clinic Iodine 12.5 mg is a balanced formula containing both of the essential types of iodine: elemental and inorganic (they each work on different tissues). Because the iodine is housed in a capsule, versus a tablet, it is the most bioavailable and complete form that you can buy. To provide the highest quality of iodine available, Riordan Clinic has partnered with a manufacturer who also makes prescription thyroid nutrients so you can also be assured of its content and quality.