Niacin (vitamin B3)

Niacin, or vitamin B3, is a water-soluble vitamin. The figure here is the niacin equivalent, which includes the niacin the body makes from the amino acid tryptophan. This page sets out what may be said about niacin under the authorised UK wording and which foods carry the most of it per 100 g.

Niacin, or vitamin B3, is a water-soluble vitamin. The figure here is the niacin equivalent, which includes the niacin the body makes from the amino acid tryptophan.

The reference intake used on UK labels (the NRV) is 16 mg a day. A food is a source of niacin when 100 g carries at least 15 % of that (2.4 mg) and high in niacin at 30 % (4.8 mg). Those are the thresholds every food page here uses.

What Niacin (vitamin B3) does in the body.

Niacin contributes to normal energy-yielding metabolism, to normal psychological function and to the reduction of tiredness and fatigue.

Niacin contributes to normal energy-yielding metabolism, to normal psychological function and to the reduction of tiredness and fatigue.

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 niacin on UK labels is 16 mg a day. A food counts as a source of niacin at 15 % of that per 100 g (2.4 mg) and as high in niacin at 30 % (4.8 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 niacin, per 100 g.

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

Where Niacin (vitamin B3) comes from in food.

bran (32 mg), tuna (28 mg), powder coffee (27.7 mg), malted flake breakfast cereal (26.1 mg), milk shake (25.3 mg), lamb liver (24.8 mg), chicken breast (22 mg), pork fillet medallions (21.8 mg)

Niacin (vitamin B3) in the Immufix formula.

Niacin is declared on the Immufix label at 4.5 mg per 25 g scoop, which is 28.1 % 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.