Iodine is a trace mineral that is essential for the healthy functioning of the thyroid gland. It helps to make the thyroid hormones that help to regulate the body’s metabolic rate.
Because iodine is a trace mineral, we only need to consume it in tiny amounts, unlike the major minerals that we require in larger amounts.
Fish, shellfish and seaweed are all good sources of iodine. Some salt is ‘iodised’ which means it’s been fortified with iodine but this is more common in the US than the UK.
Other foods, such as some vegetables, cereals and grains can also contain iodine if they’re grown in soil near the coastline that contains iodine that’s leached from the sea.