From 13 December 2026, millers and importers in the UK must add folic acid to most non-wholemeal wheat flour, under rules that will change the ingredients of everyday foods from white bread to pizza bases. The change takes effect one month from today, and MPs are scheduled to debate it the day after it comes into force.

The requirement is set out in the Bread and Flour (Amendment) (England) Regulations 2024, with matching regulations in Scotland, Wales and Northern Ireland. Millers must add 250 micrograms of folic acid — the synthetic form of folate, also known as vitamin B9 — to every 100 grams of non-wholemeal common wheat flour.

What the new flour rules cover

The rule applies to non-wholemeal flour made from common wheat, which is the flour used in most white and brown bread, rolls, cakes, biscuits, pastries and pizza bases. Wholemeal flour is exempt, as are non-wheat flours such as soya and spelt, gluten-free products and flour from small mills producing less than 500 tonnes a year.

Flour that was labelled or placed on the market before 13 December under the old rules can continue to be sold afterwards. Added folic acid must be listed in a product's ingredients, including when fortified flour is used as an ingredient in another food. The change builds on long-standing fortification: non-wholemeal wheat flour in the UK already has calcium, iron, niacin and thiamine added by law.

Why the government is adding folic acid

The government's stated aim is to reduce neural tube defects, such as spina bifida, which it says affect around 1,000 pregnancies a year in the UK. It expects fortification to prevent around 200 of those cases a year, roughly 20 per cent of the total.

The Scientific Advisory Committee on Nutrition, which advises the four UK governments on nutrition, first recommended fortifying flour with folic acid in 2006 and reaffirmed that advice in 2017. In its response to the parliamentary petition on the policy, the government said voluntary fortification by manufacturers and public health campaigns promoting supplements had limited success, and that almost half of pregnancies in the UK are unplanned, so many women do not take supplements during the critical early weeks of pregnancy.

The petition and the Parliament debate

A parliamentary petition created by Dr Clare Craig, a former NHS pathologist, calls for the policy to be stopped immediately, arguing that it is unethical to "mass medicate" the whole population without consent. The petition has attracted more than 130,000 signatures, passing the 100,000 threshold for Parliament to consider a debate, and the House of Commons Petitions Committee has scheduled a Westminster Hall debate for 14 December 2026 at 6pm.

In its response to the petition in June 2026, the Department of Health and Social Care described folic acid fortification as an evidenced public health measure rather than a medical intervention, and said limiting it to non-wholemeal wheat flour preserved consumer choice because unfortified wholemeal and non-wheat flours remain available. A Westminster Hall petition debate does not automatically repeal or suspend legislation, so the requirements remain scheduled to begin on 13 December.

What shoppers will notice

Most shoppers are unlikely to see an immediate change on the shelves, as manufacturers were given a two-year transition period and some fortified flour has already entered the supply chain. The most visible difference will be on ingredient lists, where folic acid must now be declared.

NHS advice on folic acid supplements is unchanged by the flour rule. The NHS recommends a daily 400-microgram folic acid supplement for people who could become pregnant, before conception and during early pregnancy. People with specific medical conditions, or who take particular medicines, are advised to seek advice from a healthcare professional.

Frequently asked questions

Which flour is affected by the new rule? Non-wholemeal common wheat flour, including the flour used in most white and brown bread, cakes, biscuits and pizza bases.

Is wholemeal bread affected? No. Wholemeal flour is exempt from mandatory fortification, as are non-wheat flours, gluten-free products and flour from qualifying small mills.

What happens at the debate on 14 December? MPs will debate the petition in Westminster Hall. A petition debate gives MPs a chance to examine the objections, but it does not by itself change the law.

Will I still need a folic acid supplement? The NHS still recommends a daily 400-microgram supplement for people who could become pregnant. Anyone with a medical condition or taking medication should speak to a healthcare professional.