We can supply one kind of iodine: calcium iodate
Iodine is a mineral needed in the diets of animals. It is unique among minerals, because a deficiency leads to a specific and easily recognizable thyroid gland enlargement, called goiter. Iodine is important in the synthesis of the thyroid hormones, thyroxine (T4) and triiodothyronine (T3), that regulate energy metabolism in animals. The thyroid hormones are responsible for setting the basal metabolic rate that is a component of the energy needed for maintenance of the body. Iodine likely plays an important role in protecting the body against infection in poultry. Through the action of various enzymes, iodine can form a number of active compounds important in fighting disease. Iodine itself is an important disinfecting agent.