Iodine, a non-metallic element, symbol I, element 53 on the periodic table, is located in the fifth cycle of the chemical periodic table and is one of the VII A and halogen group elements. In 1811, French pharmacist Kuteva first discovered elemental iodine. The elemental iodine is a purple black crystal that is prone to sublimation. After sublimation, it is prone to condensation and is toxic and corrosive. Simple iodine will turn blue purple when it comes into contact with starch. Mainly used in the production of drugs, dyes, iodine wine, test papers, and iodine compounds.

Iodine is one of the essential trace elements in the human body. The total amount of iodine in healthy adults is 30 milligrams (20-50 milligrams), and the national standard for adding iodine to salt is 20-30 milligrams per kilogram. Iodine is a component of Thyroid hormones and plays different physiological functions through Thyroid hormones, mainly including promoting growth and development, participating in brain development, regulating metabolism, etc