Fortified and Enriched Foods: Which Vitamins Are Added, Where and Why

Overview

Some foods have vitamins added to them. The World Health Organization (WHO) defines fortification as deliberately increasing the content of one or more micronutrients (vitamins and minerals) in a food or condiment. [1] It adds that adding micronutrients can also restore the content lost during processing. [1] WHO separates two kinds. Mandatory fortification is when governments legally oblige producers to fortify particular foods. Voluntary fortification is when a manufacturer freely chooses to fortify. [1]

This page covers vitamins added to food, mainly B vitamins. For the broader topic see Fortified foods. For vitamin D and B12 in fortified foods see Foods high in vitamin D and Foods high in vitamin B12.

What the rules say in three places

Rules differ by country. The table shows only what the rules I could read say. The units are as published (per pound in the US rule and per 100 g in the others), and this page does not convert between them.

Notes on the table:

• Canada. Vitamin B6 and pantothenic acid may optionally be added to white flour. [3]


• UK. The folic acid rule does not apply to wholemeal flour or to flour from small mills. [4] The England regulations were made in 2024, with some provisions starting on 13 December 2026. [5] The guidance says folic acid must be added at 0.25 mg regardless of the natural folate level in the flour. [4] The UK government said flour has been fortified with calcium, iron, niacin and thiamine since the Second World War. [6] I read the England regulations and the UK-wide guidance; I did not read the Scottish, Welsh and Northern Irish instruments.


• Not covered. Proper evidence not found here for a full list of countries and what each requires. I read WHO, the US eCFR, the CFIA and UK government pages. Health Canada's own fortification pages and the Food Fortification Initiative map could not be loaded.

Foods fortified by choice

• Breakfast cereals. The UK government says folic acid is already voluntarily added by manufacturers to breakfast cereal, including some gluten-free products. [6] The NIH Office of Dietary Supplements (ODS, US) gives examples of cereals fortified with 100% of the Daily Value for thiamin (1.2 mg per serving) and riboflavin (1.3 mg per serving). [7][8]
• Bread, cereals and grains. The ODS says breads, cereals and infant formulas in the US and many other countries are fortified with thiamin, and that grains and cereals are fortified with riboflavin. [7][8] It says many breads, cereals and infant formulas also contain added niacin, and that niacin in enriched and fortified foods is in a free form that is highly bioavailable. [9]
• How much of the diet. The ODS reports that about half of the thiamin in the US diet comes from foods that naturally contain it, and the remainder from foods with added thiamin. [7]
• Few foods carry added vitamin K. [10]

Why governments do it

WHO recommends large-scale fortification, including of wheat flour, maize flour and rice with vitamins and minerals. [1] It says mandatory rules are most often applied to iodine, iron, vitamin A and folic acid. [1] The UK government stated that adding folic acid to food has helped to reduce neural tube defects in a number of countries. [6] That is a government statement, not a trial result. The UK government also said the NHS advice for women who could become pregnant to take a 400 mcg folic acid tablet daily will continue. [6] See Folic acid and folate before and during pregnancy.

Reading labels

• For vitamin K, the ODS notes that the FDA does not require food labels to list the content unless it has been added to the food; I did not check whether the same wording applies to other vitamins. [10] The ODS food tables include cereals described as fortified with 100% of the Daily Value for thiamin and riboflavin. [7][8]
• UK rules say added folic acid will need to be shown on the labelling of foods made with flour. [6] The UK guidance says added vitamins and minerals must be declared by their names in word form. [4]
• Amounts differ between products and countries. Compare labels in Comparing supplement labels.

Who should think twice

• Supplements on top of fortified foods. Fortified foods and supplements add together. Upper limits are defined differently: the US niacin upper limit applies only to supplemental niacin, while the US vitamin B6 limit applies to food and supplements. [9][11] Ask a pharmacist if you use several products. See Food vs supplement sources and RDA, AI, DV and UL.
• Folic acid and B12. The NHS says folic acid doses higher than 1 mg can mask the symptoms of vitamin B12 deficiency, which is a particular concern for older people. [12] That statement is about doses, not about fortified foods; ask your clinician.
• Wholemeal or wheat-free eaters. The UK government says wholemeal flour has more naturally occurring folate than non-wholemeal wheat flour, and that wholemeal and gluten-free foods are not under mandatory fortification. [6]
• Vegans. The NHS says vitamin B12 is not found naturally in fruit, vegetables and grains, so vegans may not get enough. [12] See Vitamin B12 for vegetarians and vegans.
• Pregnancy, children, kidney or liver disease. Fortified foods are not a substitute for medical advice on supplements; ask a clinician.