Consuming non-iodized salt for a long period of time does not have much benefit to the body, but is harmful to health due to the lack of iodine. Non-iodized salt is non-iodized salt, suitable for people in coastal areas who often eat seafood and other seafood, or patients suffering from iodine-induced goiter and hyperiodinemic hyperthyroidism. For the average person, the recommended daily intake of iodine is 150 to 300 micrograms, because iodine is an essential trace element, but iodine can not be synthesized by our body itself, but only through the outside world to obtain, in addition to seawater in the iodine content of the sea is higher, most of the soil, rocks and freshwater in the iodine content is very low. Therefore, most of the areas in China that are not near the sea are iodine-deficient and need to rely on iodized salt to supplement the iodine needed by the human body. Inadequate intake may result in iodine deficiency disorders, including mental retardation (e.g., endemic cretinism), preterm delivery, miscarriage, or birth of congenital malformations in pregnant women, which affects the normal development of the fetus’s brain, and goiter (commonly known as “big-neckedness”).