Some table salt sold for consumption contain additives which address a variety of health concerns, especially in the developing world. The identities and amounts of additives vary widely from country to country.

Iodine is an important micronutrient for humans, and a deficiency of the element can cause lowered production of thyroxine (hypothyroidism) and enlargement of the thyroid gland (endemic goitre) in adults or cretinism in children.
[38] Iodized salt has been used to correct these conditions since 1924
[39] and consists of table salt mixed with a minute amount of potassium iodide, sodium iodide or sodium iodate.