Iodine is a trace mineral. In the UK diet most of it comes from milk, dairy foods and white fish. This page sets out what may be said about iodine under the authorised UK wording and which foods carry the most of it per 100 g.
Iodine is a trace mineral. In the UK diet most of it comes from milk, dairy foods and white fish.
The reference intake used on UK labels (the NRV) is 0.15 mg a day. A food is a source of iodine when 100 g carries at least 15 % of that (0.0225 mg) and high in iodine at 30 % (0.045 mg). Those are the thresholds every food page here uses.
What Iodine does in the body.
Iodine contributes to normal cognitive function and to normal thyroid function.
Iodine contributes to normal cognitive function and to normal thyroid function.
That is the authorised wording, and it is credited to the nutrient itself. Nothing on this page goes beyond it.
How much counts as a source.
The Nutrient Reference Value for iodine on UK labels is 0.15 mg a day. A food counts as a source of iodine at 15 % of that per 100 g (0.0225 mg) and as high in iodine at 30 % (0.045 mg); drinks use half those percentages per 100 ml. Those are the thresholds every food page here applies, and the only basis on which a food page says “source of” or “high in”.
Foods with the most iodine, per 100 g.
Per 100 g, these are the foods in the database with the most iodine. Dishes and recipes are left out so the list shows single foods.
293780 % of the NRV per 100 g. Full nutrition facts for Seaweed, kombu, dried, raw.
11220 % of the NRV per 100 g. Full nutrition facts for Seaweed, wakame, dried, raw.
980 % of the NRV per 100 g. Full nutrition facts for Seaweed, nori, dried, raw.
281 % of the NRV per 100 g. Full nutrition facts for Haddock, flesh only, grilled.
273 % of the NRV per 100 g. Full nutrition facts for Haddock, flesh only, poached.
267 % of the NRV per 100 g. Full nutrition facts for Shrimps, dried.
254 % of the NRV per 100 g. Full nutrition facts for Haddock, flesh only, steamed.
222 % of the NRV per 100 g. Full nutrition facts for Crab, brown meat, purchased cooked.
220 % of the NRV per 100 g. Full nutrition facts for Haddock, fillets, flesh only, in flour, fried in dripping.
220 % of the NRV per 100 g. Full nutrition facts for Haddock, fillets, flesh only, in flour, fried in sunflower oil.
213 % of the NRV per 100 g. Full nutrition facts for Haddock, flesh only, raw.
188 % of the NRV per 100 g. Full nutrition facts for Mussels in white wine sauce, cooked.
184 % of the NRV per 100 g. Full nutrition facts for Cod, flesh only, grilled.
171 % of the NRV per 100 g. Full nutrition facts for Haddock, flesh only, smoked, steamed.
171 % of the NRV per 100 g. Full nutrition facts for Cod, flesh only, steamed.
167 % of the NRV per 100 g. Full nutrition facts for Haddock, coated in crumbs, frozen, fried in blended oil.
167 % of the NRV per 100 g. Full nutrition facts for Mullet, Grey, flesh only, grilled.
165 % of the NRV per 100 g. Full nutrition facts for Mussels, purchased cooked.
162 % of the NRV per 100 g. Full nutrition facts for Cod, flesh only, microwaved.
145 % of the NRV per 100 g. Full nutrition facts for Crab, purchased cooked.
Where Iodine comes from in food.
seaweed (441 mg), haddock (0.421 mg), shrimps (0.4 mg), crab brown meat (0.333 mg), haddock fillets (0.33 mg), mussels in white wine sauce (0.282 mg), cod (0.276 mg), mullet (0.25 mg)
Iodine in the Immufix formula.
Iodine is declared on the Immufix label at 0.0375 mg per 25 g scoop, which is 25 % of the NRV. The full list of declared nutrients is on The Science page.
Questions people ask.
Under UK labelling rules a food is a source of iodine at 15 % of the NRV per 100 g, which is 0.0225 mg, and high in iodine at 30 %, which is 0.045 mg.
Where the numbers come from.
Food figures from the UK Composition of Foods Integrated Dataset (CoFID, 2021), per 100 g; reference values from Regulation (EU) 1169/2011 Annex XIII as retained in GB law; claim wording from Wording already published on the site's Science page. Contains public sector information licensed under the Open Government Licence v3.0. All foods A to Z.
One scoop, every nutrient declared.
Every vitamin and mineral in Immufix, its amount per scoop and its share of the reference intake, is on The Science page.
See what’s in the scoop