From December 13, 2026, the UK government will legally require the addition of folic acid (synthetic vitamin B9) to most non-wholemeal (white and brown) wheat flour produced or sold in the UK. This new law means the man-made vitamin will be present in everyday items like white bread, pasta, and baked goods made with this flour.
Folic acid will be added directly to non-wholemeal common wheat flour at a rate of 0.25mg per 100g of flour, rather than just injected into finished bread. It affects most white and brown flours, including imported white flour. Wholemeal flour, gluten-free products, and flour from small-scale independent millers are excluded from this requirement. Non-wholemeal wheat flour in the UK already has mandatory additions of calcium carbonate, iron, thiamin (B1), and niacin (B3).
Why is folic acid being added to flour?
The decision was made to help reduce the incidence of neural tube defects (NTDs), such as spina bifida, in pregnancies, particularly unplanned ones. NTDs are serious birth defects of the brain, spine, or spinal cord. They happen very early in pregnancy, usually within the first four weeks, often before a person even knows they are pregnant.
Folic acid is the synthetic, man-made form of vitamin B9, whereas folate is the version found naturally in foods like leafy greens, beans, and citrus fruits. Although they are the same essential nutrient, food manufacturers and health authorities use synthetic folic acid for fortification because natural folate is fragile and easily destroyed by heat during baking and cooking. Folic acid is far more stable, meaning it withstands high oven temperatures and long shelf lives, delivering a reliable, measurable dose of vitamin B9 in everyday staples like bread and pasta. While the body absorbs natural folate directly in the gut, synthetic folic acid requires the liver to convert it into its active form before it can be used.
Impact on birth defects and the NHS
The UK government is adding synthetic folic acid to non-wholemeal wheat flour primarily to prevent around 200 cases of serious birth defects, such as spina bifida, every year. Because a baby's brain and spine begin forming within the first four weeks of pregnancy, often before a woman even realises she is pregnant, taking vitamin tablets after a positive test is frequently too late. Roughly half of all UK pregnancies are unplanned, and only a third of women take supplements before conception. Fortifying an everyday staple is hoped to ensure that women have enough vitamin B9 in their bodies in advance.
Because non-wholemeal flour is a core ingredient in bread, pasta, cakes, and biscuits, adding the vitamin at the milling stage reaches almost every household automatically. The policy builds on existing laws that have required millers to add calcium, iron, and other B vitamins to white flour since the 1940s. Alongside following the lead of over 60 other countries, the government estimates the measure will save the NHS roughly £20 million and boost the wider economy by over £90 million across ten years by reducing lifelong medical care costs.
According to the NHS, fortifying flour is designed to raise baseline population levels rather than replace individual supplements. Women who are trying for a baby or are in the first 12 weeks of pregnancy are still advised to take a daily 400-microgram folic acid tablet.
Safety and exemptions
For the vast majority of people, folic acid at the low levels added to fortified flour is considered safe by UK health authorities. Because vitamin B9 is water-soluble, the body naturally flushes out any excess through urine, and the amount added to bread and pasta is carefully calculated to keep daily intake well below the 1 mg upper safety limit for adults. Independent bodies such as the Scientific Advisory Committee on Nutrition and the Food Standards Agency have reviewed decades of data from more than 60 countries that already fortify flour. It has found no evidence of allergic reactions or widespread harm.
However, medical experts advise caution for specific groups, particularly regarding high-dose supplements rather than fortified foods alone. The most common concern is that high levels of folic acid can mask the symptoms of a vitamin B12 deficiency in older adults, potentially delaying treatment while underlying nerve damage progresses. People taking certain medications, such as methotrexate or anti-epilepsy drugs, and those with a history of bowel cancer are also advised to check their overall intake with a doctor. For anyone who wishes to avoid synthetic folic acid due to medical advice or personal preference, 100% wholemeal bread, gluten-free products, non-wheat flours, and flour from small independent mills remain exempt and unfortified.
Many bread, pasta, and baked goods on UK supermarket shelves already contain added folic acid. Although the legal deadline is 13 December 2026, the government gave millers and food producers a two-year transition period, meaning major UK flour mills began rolling out fortified flour across the supply chain from autumn 2025. In addition, any pasta, bagels, or baked goods imported from countries that already mandate fortification, such as the US, Canada, and Australia, already contain it, as do products like breakfast cereals, where brands have voluntarily added the vitamin for years. Shoppers can check whether a product already includes it by looking at the ingredients label, where it is listed in brackets alongside the wheat flour.
Sir Keir Starmer's government formally confirmed the policy in November 2024 by presenting Parliament with the final legislation requiring folic acid to be added to non-wholemeal wheat flour. Boris Johnson's Conservative government had first announced the plan in September 2021, after years of scientific recommendations. Starmer's administration signed the Bread and Flour (Amendment) (England) Regulations into law on November 13, 2024. The rules took effect on December 13, 2024, beginning a two-year transition period for millers and food producers before full enforcement begins on December 13, 2026.
Advice for pregnant women
Folic acid is essential for pregnant women and anyone trying to conceive. Health bodies such as the NHS strongly recommend taking a daily 400-microgram folic acid tablet from before conception until the 12th week of pregnancy, as it plays a vital role in the development of a baby's brain, skull, and spinal cord and significantly lowers the risk of serious neural tube defects. As well as supporting rapid cell growth and DNA production in the developing baby, folic acid helps prevent folate-deficiency anaemia in the mother. The NHS stresses that even once mandatory flour fortification begins in December 2026, women who are pregnant or planning a pregnancy will still need to take daily supplements, because the low amount added to bread and pasta is not enough on its own to provide the full level of protection required.
Dr Clare Tower, an NHS Consultant in Obstetrics and Fetal and Maternal Medicine, says: “The flour rules will help many women but may miss those trying hardest to eat well. I am not suggesting swapping wholemeal bread for white bread. My message is that fortified flour is a safety net for the population and not a replacement for the daily folic acid supplement. I urge anyone planning a baby to keep taking folic acid tablets. The reason for this is that the amount of folic acid added is modest, at 250 micrograms per 100g of flour compared to the 400 micrograms women are advised to take every day. People assume that if they’re eating well, they’re covered. But the new rules only apply to some flours, the amount is modest, and it won’t get most of us to the level we need before pregnancy. The flour will help, but it won’t replace the folic acid tablet.”
