Iodine

What iodine does

Iodine is an essential trace mineral — your body can't produce it, so it has to come from food or a supplement. Its central role is in the thyroid gland, which uses iodine to make the hormones that regulate metabolism, growth, and energy use. Because of that, iodine contributes to normal thyroid function, normal metabolism, and normal cognitive function.

Iodine and the thyroid

The thyroid can't make its hormones without iodine, which is why iodine status and thyroid function are so closely linked. The important nuance: both too little and too much iodine can disrupt the thyroid, so this isn't a "more is better" nutrient. If you have a thyroid condition or take thyroid medication, the right amount of iodine is something to work out with your healthcare provider rather than guess at. See our thyroid health collection for related support.

Forms: drops, tablets, and kelp

Liquid drops are the most common format here — easy to adjust and available in everything from low daily amounts to high-potency formulas. Nascent iodine is a specific liquid form some people prefer. Potassium iodide tablets give a fixed dose, and kelp is the whole-food route, since this seaweed is naturally rich in iodine. Strengths here range widely, from around 75 mcg to several milligrams per serving.

Iodine in Canada

Iodine supplements sold in Canada carry a Natural Product Number (NPN) from Health Canada and ship from our Ontario warehouse to addresses across Canada. Note that iodized table salt is the most common dietary source for most Canadians.

A note on iodine

More isn't better with iodine — excess can disrupt thyroid function just as a shortfall can, and the doses on this page vary widely. Don't take high-dose iodine without guidance, and if you have a thyroid condition, are pregnant, or take medication, check with your healthcare provider before supplementing.