I recently had a thermography scan done, and it showed I could have a slightly under active thyroid. I had labs done, and my numbers were all normal, but taking this will be beneficial regardless of what my labs say. I have so many symptoms of thyroid dysfunction, and iodine is such an important mineral for you. This is so easy to take and you only need 1 drop a day and it doesn't matter what time of day. It says to use purified water, but my herbalist says she wouldn't worry about not having purified water but do drink plenty of water for better absorption. It's a clear liquid that tastes a little sweet to me, so you don't have to worry about a horrible taste in your mouth.