From December 13, 2026, UK law will require non-wholemeal wheat flour produced or sold in the UK to be fortified with synthetic folic acid (vitamin B9). The requirement applies to most white and brown wheat flour, including imported white flour, at a rate of 0.25mg per 100g of flour. This means everyday staples such as white bread, pasta, and baked goods made with these flours will contain the synthetic vitamin.
Scope and exemptions
The legislation covers non-wholemeal common wheat flour, with the vitamin incorporated directly at the milling stage rather than added to finished bread products. Wholemeal flour, gluten-free products, and flour from small-scale independent millers are exempt. Non-wholemeal wheat flour in the UK already has mandatory additions of calcium carbonate, iron, thiamin (B1), and niacin (B3).
Health rationale and expected impact
The move aims to reduce the number of neural tube defects (NTDs), such as spina bifida, occurring in pregnancies, particularly unplanned ones. NTDs are serious birth defects affecting the brain, spine, or spinal cord, and develop very early in pregnancy, typically within the first four weeks, often before a person is aware they are expecting.
Around half of all UK pregnancies are unplanned, and only a third of women take supplements prior to conception. Fortifying an everyday staple is intended to ensure that women have sufficient vitamin B9 in their systems beforehand. The Government projects the measure will save the NHS approximately £20 million and generate over £90 million for the broader economy over a decade by reducing expenditure on lifelong medical care.
Official statements and expert advice
Andrew Gwynne, Minister for Public Health and Prevention, said: "Shifting care from sickness to prevention is one of the leading ambitions in our 10 Year Health Plan, as we work to make our NHS fit for the future. These measures are a simple and effective intervention to improve health outcomes in babies, giving them the best start in life."
Baroness Merron, Minister for Patient Safety, Women’s Health and Mental Health, said: "Fortifying bread and flour with folic acid will help reduce neural tube defects and give women greater peace of mind throughout their pregnancy. This government is determined to support women and turn around maternity outcomes so every child can live a long, happy and fulfilling life."
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."
Safety and implementation timeline
For the overwhelming majority of people, folic acid at the modest levels incorporated into fortified flour is deemed safe by UK health authorities. As vitamin B9 is water-soluble, the body naturally expels any excess through urine, and the amount added is calculated to keep daily intake below the 1 mg upper safety threshold for adults. Independent bodies, including the Scientific Advisory Committee on Nutrition and the Food Standards Agency, have examined evidence from over 60 countries that already fortify flour and found no indication of allergic reactions or widespread adverse effects.
Medical experts urge caution for certain groups, particularly with high-dose supplements rather than fortified foods. Elevated levels of folic acid may conceal symptoms of a vitamin B12 deficiency in older adults. Individuals taking particular medications, such as methotrexate or anti-epilepsy drugs, and those with a history of bowel cancer are recommended to discuss their overall intake with a doctor. For anyone who needs to avoid synthetic folic acid, 100% wholemeal bread, gluten-free products, non-wheat flours, and flour from small independent mills remain exempt.
Sir Keir Starmer's Government formally confirmed the policy in November 2024 by presenting Parliament with the final legislation. Boris Johnson's Conservative Government had initially announced the plan in September 2021. Starmer's administration signed the Bread and Flour (Amendment) (England) Regulations into law on 13 November 2024, with a two-year transition period before full enforcement on 13 December 2026. Major UK flour mills began introducing fortified flour across the supply chain from autumn 2025.
