 and it's not fully absorbable by the cells. It's the missing link. Even the UN estimates 2 plus billion people have cognitive disabilities because of iodine deficiency. Up until the 30s, we had major IQ reduction because of lack of iodine in the U.S. food supply, especially in the U.S. Midwest. From the 30s to the early 80s, the government put crappy iodine in the salt by law.