Red 40 is not banned in Europe. It is a legally authorized food additive in both the European Union and the United Kingdom, where it goes by the name Allura Red AC and carries the E-number E129. However, European regulations treat it very differently than the United States does, requiring a mandatory warning label on any food or drink that contains it. This distinction between “banned” and “restricted with warnings” is the source of widespread confusion.
What Europe Actually Requires
Any food or drink sold in Europe that contains Red 40 must carry the following statement on its packaging: “May have an adverse effect on activity and attention in children.” This isn’t optional guidance. It’s a legal requirement that applies to Red 40 and five other synthetic food dyes: sunset yellow (E110), quinoline yellow (E104), carmoisine (E122), tartrazine (E102), and ponceau 4R (E124). All six are collectively known as the “Southampton colours,” named after the university study that prompted the regulation.
The practical effect of this warning label has been enormous. Most major European food manufacturers have voluntarily reformulated their products to remove these dyes rather than print a warning that links their product to behavioral problems in children. This is why a Skittles packet or a Fanta bottle in Europe often looks different from its American counterpart: the colors come from plant-based sources instead. The dye isn’t illegal, but the warning label makes it commercially unattractive.
The Study That Changed European Policy
The warning label traces back to a 2007 study published in The Lancet, one of the world’s most respected medical journals. Researchers at the University of Southampton gave nearly 300 children, split into groups of 3-year-olds and 8/9-year-olds, drinks containing either a mix of artificial food colors (including Red 40) with the preservative sodium benzoate, or a placebo drink. Parents, teachers, and researchers then rated the children’s behavior, and the older children also took a computerized attention test.
The results showed a statistically significant increase in hyperactive behavior in children who consumed the dye mixtures compared to placebo. Among the 3-year-olds, one dye mixture produced a measurable effect on hyperactivity. Among the 8/9-year-olds who drank at least 85% of the test beverages, both dye mixtures produced significant effects. The effect sizes were modest, but the study was notable because it tested children from the general population, not just children already diagnosed with attention disorders. That made the findings harder to dismiss as relevant only to a sensitive subgroup.
Europe’s Safety Threshold
The European Food Safety Authority (EFSA) reviewed Red 40 and set an acceptable daily intake of 7 milligrams per kilogram of body weight per day. For a 70-kilogram adult, that works out to about 490 milligrams daily. EFSA concluded that the existing safety data didn’t justify banning the dye outright or lowering that threshold. The warning label requirement came separately, through the European Parliament, as a precautionary measure focused specifically on children’s behavior rather than toxicity in the traditional sense.
This is an important distinction. European regulators didn’t conclude that Red 40 is poisonous or cancer-causing at normal dietary levels. They concluded that the evidence linking artificial dyes to behavioral changes in children was strong enough to warrant informing parents, even if the biological mechanism wasn’t fully understood.
Why European Products Look Different
Because the warning label effectively discourages use, European food manufacturers have turned to natural colorants. Red shades come from beet extract (betanin), carminic acid extracted from cochineal insects, or rare compounds like amaranthine from amaranth flowers. Orange tones come from beta-carotene sourced from carrots, and yellows from curcumin (turmeric) or riboflavin produced through microbial fermentation.
These natural alternatives tend to be more expensive and less stable. They can fade in sunlight, shift color at different acidity levels, and have shorter shelf lives. This is partly why American manufacturers have been slower to switch: without a regulatory push like Europe’s warning label, the cost-benefit math looks different. The result is that the same product from the same multinational company can contain Red 40 in the U.S. and beet juice concentrate in Europe.
How This Compares to the U.S.
The U.S. Food and Drug Administration has reviewed the same body of evidence and reached a different regulatory conclusion. The FDA considers Red 40 safe for consumption and does not require any behavioral warning. It must be listed on ingredient labels, but without cautionary language. In early 2025, the FDA announced a review of synthetic food dyes in response to growing public concern and new state-level legislation, but no federal warning or restriction is currently in place.
California became the first U.S. state to require its own warning label for Red 40, effective in 2028. A handful of other states have introduced or passed similar measures. This patchwork approach contrasts with Europe’s continent-wide standard, and it’s one reason American consumers searching this topic often assume the dye must be outright banned elsewhere. The reality is more nuanced: Europe permits it but makes the commercial environment hostile enough that most companies choose to avoid it voluntarily.