Below you can find the Seafood is a good source of this element necessary for the formation of thyroid hormones Jeopardy Words Answer. The answer to Seafood is a good source of this element necessary for the formation of thyroid hormones has 6 letters. This clue belongs to the Science category and is part of Jeopardy Word Level 2618. If you scroll near the bottom you will find other clues and answers part of level 2618