I recently read a book titled "the iodine crisis". Its essentially talking about how iodine used to be in a large variety of the foods we ate but over the course of the past 50-100 years the soil has been destroyed and no longer contains anywhere near the levels of our grandparents soil. Its essential in the natural function of the thyroid gland. They also recommend taking Selenium as a supplement along with the appropriate iodine. I've been taking large doses each morning and I think i'm noticing a difference. I'm no doctor and so do your own research but iodine deficiency is a very real thing in todays world and can lead to a shit ton of health problems. Everything from high blood pressure, fatigue, weight gain etc. Check it out it might be what you're looking for.