Why Some Food Dyes Are Banned in Europe but Legal in the US
The EU and US take fundamentally different approaches to food dye regulation. Learn which dyes are restricted, why, and what the science says.
Walk down the candy aisle in a British supermarket and you will find Skittles colored with fruit and vegetable concentrates — beet juice, turmeric extract, black carrot. Cross the Atlantic and those same Skittles are colored with Red 40, Yellow 5, and Blue 1. Same brand, same product, completely different ingredients. The reason lies not in different science but in fundamentally different regulatory philosophies.
Two Philosophies: Precautionary vs. Risk-Based
The European Union operates under the precautionary principle, codified in Article 191 of the Treaty on the Functioning of the EU. In practice, this means that if there is plausible scientific concern about a substance — even without definitive proof of harm — regulators can restrict it. The burden of proving safety falls heavily on the manufacturer.
The United States FDA uses a risk-based approach. Under the Federal Food, Drug, and Cosmetic Act, a color additive must be shown to cause harm at typical exposure levels before the FDA will restrict it. The burden of proving danger rests more with those seeking a ban. This creates a higher threshold for regulatory action, which is why substances banned or restricted in the EU can remain on US shelves for years or decades longer.
The Southampton Study That Changed Europe
The pivotal moment for European food dye regulation came in 2007, when researchers at the University of Southampton published a study in The Lancet. The randomized, double-blind, placebo-controlled trial tested two mixtures of artificial colors and the preservative sodium benzoate on nearly 300 children aged 3 and 8–9 years old.
The results showed a statistically significant increase in hyperactive behavior in both age groups when consuming the additive mixtures compared to placebo. The study tested two mixes:
- Mix A: Sunset Yellow (E110), Carmoisine (E122), Tartrazine (E102), Ponceau 4R (E124), plus sodium benzoate
- Mix B: Sunset Yellow (E110), Carmoisine (E122), Quinoline Yellow (E104), Allura Red (E129), plus sodium benzoate
EFSA reviewed the study and concluded that while the findings were relevant, the effect sizes were small and the clinical significance uncertain. Nevertheless, the EU adopted a compromise: rather than an outright ban, Regulation (EC) No 1333/2008 required that foods containing any of the six "Southampton dyes" carry the warning: "May have an adverse effect on activity and attention in children."
This warning label had an effect more powerful than a ban. Major food manufacturers reformulated products for the EU market rather than put a warning that would suppress sales. The result is that many products sold in Europe simply do not contain these dyes anymore — not because they are illegal, but because the market rejected them.
Dye by Dye: Where They Stand
E102 — Tartrazine (Yellow 5)
Tartrazine is an azo dye that gives food a bright lemon-yellow color. It is used globally in soft drinks, instant noodles, and candy. In the EU, it requires the Southampton warning label. Austria and Norway previously banned it entirely, though EU harmonization overruled national bans. The FDA requires it to be listed on US labels because it is a known allergen trigger for aspirin-sensitive individuals, affecting an estimated 0.6–2.9% of the population. Look it up in our banned additives database.
E110 — Sunset Yellow
Sunset Yellow FCF is used in orange-colored drinks, sauces, and confectionery. It carries the EU warning label and is banned outright in Finland and Norway (pre-EU harmonization). The EU ADI is 4 mg/kg body weight. FDA-approved with no specific restrictions beyond labeling. Studies have shown it can cause allergic reactions in people sensitive to aspirin and may exacerbate symptoms in those with pre-existing asthma.
E122 — Carmoisine (Azorubine)
Carmoisine is a red azo dye used in jams, yogurts, and cheesecake mixes. It is one of the Southampton six and carries the EU warning label. Notably, carmoisine was never approved by the FDA — it is not legal in the US at all, though not because of a ban based on the Southampton study. The FDA simply never received a petition for its approval. It is also banned in Japan, Canada, and Australia (for use in some products).
E124 — Ponceau 4R
Ponceau 4R provides a strawberry-red color and is common in desserts, canned fruits, and seafood dressings in markets where it is permitted. Like carmoisine, it was never FDA-approved, so it is not used in the US. The EU permits it with the mandatory warning label. Norway banned it in 1978. EFSA set an ADI of 0.7 mg/kg body weight in 2009.
E129 — Allura Red (Red 40)
Allura Red is the most contentious dye because it is both heavily used in the US and carries the warning label in the EU. It is the single most consumed food dye in America, accounting for approximately 40% of all food dye consumption by weight. The 2023 Nature Communications study linking Red 40 to intestinal inflammation in mice added fuel to a decades-old debate. California's Food Safety Act does not ban Red 40 but does ban Red 3 (erythrosine), signaling a shift in US state-level regulation.
Why the FDA Has Been Slow to Act
The FDA last comprehensively reviewed artificial food dyes in 2011, convening an advisory committee that voted 8-6 that current evidence did not support a causal link between synthetic dyes and hyperactivity in the general population. The committee did acknowledge that some children might be susceptible, but declined to recommend warning labels or restrictions.
Several structural factors slow FDA action on dyes:
- Legal standard: The Delaney Clause requires proof that an additive causes cancer in humans or animals before an automatic ban. Behavioral effects like hyperactivity do not trigger this clause.
- Industry lobbying: The International Association of Color Manufacturers has consistently argued that the evidence for behavioral effects is inconclusive.
- Reformulation costs: Replacing synthetic dyes with natural alternatives increases costs by 2–10x per unit, creating significant industry resistance.
- Regulatory backlog: The FDA has over 10,000 additives to monitor with limited resources, and dye reviews compete with more urgent safety evaluations.
State-Level Action in the US
With federal action stalled, US states are beginning to legislate independently. California's Food Safety Act (AB 418), signed in October 2023, banned Red 3 (erythrosine), potassium bromate, brominated vegetable oil, and propylparaben from food products starting January 2027. While Red 40 was not included in the final bill, it was in earlier drafts. New York, Illinois, and Washington state have introduced similar bills.
This patchwork approach mirrors what happened with BPA regulation, where state-level bans eventually prompted industry-wide reformulation even without a federal mandate.
What This Means for Consumers
The transatlantic regulatory divide means that identical brand-name products can have completely different ingredient lists depending on where they are sold. Fanta, Kraft Mac & Cheese, Doritos, and M&Ms all use different coloring systems in the EU versus the US.
Here is what you can do:
- Scan your labels: Use the AdditiveChecker Analyzer to paste any ingredient list and see which dyes it contains and their regulatory status across regions.
- Know the E-numbers: If a product lists E102, E110, E122, E124, or E129, it contains one of the Southampton dyes. Browse our additive guides for detailed profiles.
- Look for natural alternatives: Annatto (E160b), paprika extract (E160c), beetroot red (E162), and anthocyanins (E163) provide similar colors without the controversy.
- Check our database: Our banned additives page shows the regulatory status of every dye across the EU, US, Canada, and other major markets.
The gap between EU and US food dye regulation is not closing — if anything, it is widening as EFSA adopts stricter re-evaluation schedules while the FDA faces political and structural barriers to reform. Informed consumers who understand both systems are better equipped to make choices aligned with their own risk tolerance.