Generally, the iodine content in an adult is about 35 mg, of which 70% ~ 80% exists in the thyroid gland, and the rest exists in tissues and plasma in the form of free iodine ions or protein binding. The main functions of iodine are: ① to form thyroxine, regulate the body's energy metabolism, promote growth and development, and maintain normal reproductive function and nerve activity; ② Maintain the luster of human skin and hair.

If copper is deficient, it will cause dry and rough skin, dry hair, anemia, weakened reproductive function and reduced human disease resistance.

If iodine deficiency, it can lead to compensatory thyroid hypertrophy, mental and physical development disorders, skin wrinkles and loss of luster, impatience, loss of facial expression and other consequences.

Foods rich in iodine include kelp, laver, sea cucumber, jellyfish, razor clam, shrimp, clam, clam and other seafood, as well as carrots, tomatoes, mushrooms, beans, peas, cuttlefish, bananas, Chinese cabbage, walnuts, animal livers and kidneys.