The element is available is drinking water, vegetables and fish.
Table salts are also compulsorily iodized to provide iodine in the diet.
All sea foods are rich in iodine.
Iodine is required only in traces for the proper functioning of thyroid gland, especially the secretion of thyroxine.
In the deficiency of iodine, thyroid gland enlarges and a disorder called goitre is produced.