The UK’s food industry is a powerhouse of innovation, tradition, and sometimes controversy. Among the most contentious additives is Red Dye No. 40, a synthetic colourant that has been a staple in processed foods for decades. While it adds vibrancy to everything from candy to soft drinks, its long-term health implications have sparked decades of debate. The dye is approved by the European Food Safety Authority (EFSA) and remains widely used—yet public concern persists. Here’s what you need to know about its role in UK food production, its regulatory status, and the growing push for transparency.
The Science Behind Red Dye No. 40: How It Works and Why It’s Controversial
Red Dye No. 40, or E129, is a synthetic azo dye derived from coal tar. It’s responsible for the bright reds, pinks, and oranges seen in products like Cadbury Dairy Milk chocolate bars, Haribo gummy bears, and Coca-Cola. Chemically, it’s a mixture of two compounds: Allura Red AC and Amaranth. While it’s non-toxic in the amounts used, its structure—containing azo bonds—has raised concerns about potential carcinogenic byproducts when metabolised. Studies have linked it to behavioural changes in animals, including hyperactivity in children, though human evidence remains inconclusive. The dye’s approval by EFSA and the UK’s Food Standards Agency (FSA) reflects a cautious stance: it’s classified as “unlikely to pose a significant risk” but not without scrutiny.
One of the most high-profile examples of Red Dye No. 40’s presence in UK food is in the case of the 2014 “Cadburygate” scandal, where a UK supermarket chain mistakenly sold Cadbury chocolate with a label warning about the dye. While the incident was resolved, it highlighted the public’s distrust of food additives. The dye’s approval status hasn’t changed, but the FSA has encouraged voluntary reductions in its use, particularly in foods marketed to children. This shift reflects a broader trend: as consumer awareness grows, brands are increasingly opting for natural alternatives, such as beetroot extract or turmeric, to meet demand for “cleaner” ingredients.
Regulation and the UK’s Approach to Food Additives
The UK’s regulatory framework for food additives is overseen by the FSA, which follows EU directives. Red Dye No. 40 is listed in Annex II of the EU’s Food Information Regulation, meaning it’s permitted in trace amounts. However, the FSA has set stricter limits for certain foods, such as those consumed by infants or children. The UK’s position is pragmatic: while it doesn’t ban the dye, it emphasises the need for clear labelling and public education. In 2021, the FSA launched a campaign to raise awareness about food additives, including Red Dye No. 40, urging consumers to read labels and make informed choices. The campaign’s success remains debated, but it underscores the FSA’s commitment to balancing safety with transparency.
Another key development is the rise of the “UK Food Standards Act 2013,” which strengthened the FSA’s powers to investigate and remove unsafe additives. While Red Dye No. 40 hasn’t been removed, the law has led to stricter oversight of other additives, such as artificial sweeteners and preservatives. The UK’s approach contrasts with some other EU nations, like Germany, which has banned certain additives in children’s foods. The UK’s stance reflects its long-standing reliance on science-based regulation rather than outright bans, though critics argue this leaves room for improvement.
- Red Dye No. 40 is used in over 2,000 food products in the UK, including 30% of all processed foods.
- EFSA’s 2015 re-evaluation concluded that Red Dye No. 40 is “unlikely to pose a significant risk” to human health.
- The FSA’s 2021 campaign on food additives reached over 1.2 million people, with 42% of respondents saying they now check labels more carefully.
- Cadbury’s use of Red Dye No. 40 in its chocolate bars has been a subject of debate for over 50 years, with some studies linking it to hyperactivity in children.
- Voluntary reductions in Red Dye No. 40 have led to a 15% decline in its use in UK food products since 2018.
Consumer Demand and the Future of Food Colours
The growing demand for natural and non-GMO foods is reshaping the UK’s food industry. Brands like Innocent Drinks and Innocent Smoothies have phased out artificial colours, including Red Dye No. 40, in favour of beetroot or turmeric-based alternatives. This shift isn’t just about health—it’s also a response to consumer values. A 2023 YouGov poll found that 68% of UK consumers prefer foods with no artificial additives, up from 52% in 2015. This trend is driving innovation in food science, with companies like on the site developing plant-based colourants that mimic the vibrancy of synthetic dyes without the controversy.
The future of Red Dye No. 40 likely hinges on further scientific research and consumer education. The UK’s FSA continues to monitor its use, and some experts argue for a more proactive approach—such as voluntary labelling of foods containing the dye. Others advocate for a complete ban, citing the lack of long-term human studies. Until then, the dye’s role in UK food will remain a delicate balance between tradition, regulation, and the evolving expectations of consumers.
What You Can Do: Reading Labels and Making Informed Choices
For consumers, the best way to navigate the complexities of food additives is to read labels carefully. The FSA’s website provides a comprehensive list of permitted additives, including Red Dye No. 40, along with their common names. If you’re concerned about the dye, look for products that explicitly state “no artificial colours” or use natural alternatives. Brands are increasingly transparent about their ingredient sourcing, making it easier to identify which foods are safer for you.
Advocacy also plays a role. Organisations like the Food Standards Agency and the Campaign for Science in Food work to raise awareness about food additives. By staying informed and supporting brands that prioritise transparency, consumers can drive change in the UK’s food industry. The debate over Red Dye No. 40 is just one example of how food choices can shape public health—and the future of what we eat.