Hormones regulate metabolism and initiate the release of the many biochemicals associated with energy creation. The thyroid uses iodine to form triiodothyronine (T3) and thyroxine (T4), the two hormones which regulate all other hormones.
The best dietary sources of iodine include seafood, sea vegetables (dulse seaweed, arame, kombu, and wakame), and dark leafy greens. Iodine supplements can also be taken. The best and most bioavailable supplements are colloidal or nascent iodine.