
A 1926 advertisement for Morton’s Salt described how iodized salt helped ensure the mental and physical health of children. The information in the advertisement was based on discoveries made a few years earlier. Iodine deficiency is a leading cause of preventable developmental and intellectual disabilities, as well as a cause of goiters, which is an enlargement of the thyroid gland.
In the early 20th century, a Swiss doctor discovered that a very small amount of iodine could prevent goiters. It was also found that salt was an effective way to distribute iodine. Salt does not spoil, and iodine in salt remains relatively stable when stored or heated. Since very little iodine needs to be added to the salt, it was a cost effective way to prevent disabilities and goiters caused by lack of iodine. Switzerland was the first country to put iodine in salt.
Soon, there was interest in adding iodine to salt in the U.S. In 1924, the Morton Salt Company began offering an iodized salt.








