Thiamin (vitamin B1)

Thiamin, or vitamin B1, is a water-soluble vitamin found in wholegrains, pork, beans and fortified cereals. This page sets out what may be said about thiamin under the authorised UK wording and which foods carry the most of it per 100 g.

Thiamin, or vitamin B1, is a water-soluble vitamin found in wholegrains, pork, beans and fortified cereals.

The reference intake used on UK labels (the NRV) is 1.1 mg a day. A food is a source of thiamin when 100 g carries at least 15 % of that (0.17 mg) and high in thiamin at 30 % (0.33 mg). Those are the thresholds every food page here uses.

What Thiamin (vitamin B1) does in the body.

Thiamin contributes to normal energy-yielding metabolism, to the normal function of the heart and to normal psychological function.

Thiamin contributes to normal energy-yielding metabolism, to the normal function of the heart and to normal psychological 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 thiamin on UK labels is 1.1 mg a day. A food counts as a source of thiamin at 15 % of that per 100 g (0.17 mg) and as high in thiamin at 30 % (0.33 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 thiamin, per 100 g.

Per 100 g, these are the foods in the database with the most thiamin. Dishes and recipes are left out so the list shows single foods.

Where Thiamin (vitamin B1) comes from in food.

wheatgerm (1.8 mg), malted flake breakfast cereal (1.6 mg), sunflower seeds (1.6 mg), bacon rashers (1.38 mg), pork fillet medallions (1.37 mg), coriander leaves (1.25 mg), multigrain hoops breakfast cereal (1.24 mg), cornflakes breakfast cereal (1.2 mg)

Thiamin (vitamin B1) in the Immufix formula.

Thiamin is declared on the Immufix label at 0.25 mg per 25 g scoop, which is 22.7 % of the NRV. The full list of declared nutrients is on The Science page.

Questions people ask.

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.