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Iodine is combined with the amino acid ‘tyrosine’ in order to manufacture active thyroid hormone. This is the main function of iodine in the body. Although iodine’s activity is essentially linked to thyroid function, a deficiency in iodine can lead to a variety of symptoms and disorders. The main deficiency in this mineral can lead to ‘goiter’ which shows as the enlargement of the thyroid, causing swelling at the base of the neck.