Nine additives that need a warning label or are banned in the EU but stay legal in the US: Southampton dyes, titanium dioxide, bromate, ADA, propylparaben.
9/8/2026 · 9 min read · Chris Carrillo · Reviewed by Armin Rad, Co-Founder & CTO, Aurascan · Last reviewed 9/8/2026
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Written by Chris Carrillo. Reviewed by Armin Rad, Co-Founder & CTO, Aurascan. It cites 4 sources; use the source list and methodology to check the evidence directly.
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View the sample resultUnder European Union law, synthetic food dyes require mandatory packaging warnings stating they may impair child activity and attention, while substances like titanium dioxide face market bans. Conversely, the US Food and Drug Administration permits several of these compounds federally, creating distinct transatlantic formulations across common grocery brands.
Key takeaways:
To build this roundup, we evaluated common food additives regulated differently between the European Union and the United States as of September 8, 2026. Ingredients were selected if they meet at least one of two specific regulatory criteria: they trigger mandatory warning text on consumer packaging in the EU under Regulation (EC) No 1333/2008, or they have been banned or denied reauthorization by the European Commission due to safety evaluations while remaining lawful in the US.
Beyond the most widespread synthetic colorants, this selection encompasses the complete group of Southampton dyes, which includes Quinoline Yellow (E104), Carmoisine (E122), and Ponceau 4R (E124), alongside functional baking improvers and chemical preservatives. (Brominated vegetable oil is not included: the FDA revoked its authorization in 2024, so the two regions now agree.)
For each additive on this list, we review what the substance does in food, its specific European legal status, its current American regulatory status, common retail food categories where it appears, and practical tips for spotting it on product packaging.
Red 40 is a petroleum-derived synthetic azo dye widely used to impart a vibrant red hue to packaged foods, beverages, candies, and pharmaceutical syrups.
In the European Union, Regulation (EC) No 1333/2008 Annex V mandates that any food containing Allura Red AC must display the following warning phrase on the label: "may have an adverse effect on activity and attention in children." This rule followed the 2007 Southampton study evaluating synthetic color blends and behavioral responses in youth.
In the United States, the FDA permits Red 40 as a certified color additive under CFR Title 21 - Food and Drugs Subchapter B (21 CFR 74.340). While the federal government has not required behavioral warning labels, momentum has accelerated at the state level. Notable state legislation, such as California's School Food Safety Act (AB 2316), restricts Red 40 from public school meals.
Common US products include breakfast cereals, fruit snacks, powdered drink mixes, sodas, and baked desserts. On US ingredient labels, look for "FD&C Red No. 40," "Red 40," or "Red 40 Lake."
Yellow 5, also known as tartrazine, is a synthetic lemon-yellow azo dye used across thousands of processed food and beverage products.
Under EU Regulation (EC) No 1333/2008, tartrazine requires the identical mandatory warning label regarding potential adverse effects on child activity and attention. This requirement caused many European manufacturers to substitute tartrazine with plant-derived colorings like turmeric or beta-carotene.
The FDA authorizes Yellow 5 under 21 CFR 74.705 as noted in the FDA Color Additive Status List. The FDA mandates that Yellow 5 be specifically declared by name on food and cosmetic labels due to documented, though uncommon, allergic-type reactions, particularly in people with aspirin intolerance. For a deeper breakdown of this colorant, see our guide on what is tartrazine (yellow 5)? uses, safety, and labeling.
Yellow 5 frequently appears in packaged macaroni and cheese, flavored chips, carbonated sodas, pickles, and frozen desserts. On US packaging, search the ingredient deck for "FD&C Yellow No. 5," "Yellow 5," or "Tartrazine."
Yellow 6 is a synthetic orange-yellow color additive commonly added to processed snacks and confectionery.
Like Red 40 and Yellow 5, Sunset Yellow FCF is one of the six Southampton dyes covered by EU Regulation (EC) No 1333/2008. European packaged foods containing E110 must carry the mandatory warning text regarding attention and activity in children.
In the United States, Yellow 6 remains authorized for general food use under 21 CFR 74.706 without mandatory behavioral warning text, though state-level school dietary bills have targeted it. You can review full toxicology and regulatory contexts in our guide on is yellow 6 (sunset yellow, e110) safe? uses, labels, risks.
Yellow 6 is prevalent in cheese-flavored crackers, toaster pastries, citrus-flavored soft drinks, and dessert gels. To identify it, look for "FD&C Yellow No. 6," "Yellow 6," or "Yellow 6 Lake" in the ingredients list.
Erythrosine, or Red 3, is a synthetic, cherry-pink, iodine-containing coal-tar derivative historically used for intense pink and red coloring.
In the European Union, Red 3 is not permitted across general packaged foods and is strictly restricted to cocktail cherries, candied cherries, and certain pharmaceutical preparations under Regulation (EC) No 1333/2008.
In the United States, the FDA has revoked authorization for Red Dye No. 3 in food, aligning with updated toxicological assessments regarding carcinogenicity and safety concerns that previously prompted bans in cosmetics. Read our overview on what is erythrosine? uses, labels, and safety to learn more about its regulatory history.
Red 3 historically appeared in seasonal candies, maraschino cherries, cake decorating gels, and bubble gum. On US labels, it was listed as "FD&C Red No. 3" or "Red 3."
Titanium dioxide is an inorganic mineral compound widely utilized as a food-grade white pigment, opacity enhancer, and anti-caking agent.
In 2021, the European Food Safety Authority (EFSA) updated its safety assessment, concluding that titanium dioxide could no longer be considered safe as a food additive due to concerns regarding particle accumulation and potential genotoxicity. The European Commission enacted a complete ban on E171 in food via Commission Regulation (EU) 2022/63.
The US FDA permits titanium dioxide under 21 CFR 73.575, provided it does not exceed 1% by weight of the finished food. The FDA maintains that current scientific evidence supports its safety at authorized intake levels. Check our comprehensive resource on what is titanium dioxide? uses, safety, and labeling for further background.
Titanium dioxide is commonly found in powdered donut sugar, salad dressings, white sauces, coffee creamers, and chewing gums. On ingredient panels, look for "Titanium Dioxide" or "Color Added (Titanium Dioxide)."
Potassium bromate is an oxidizing chemical agent traditionally used as a flour improver and dough conditioner to strengthen gluten elasticity and promote bread rise.
Potassium bromate is not authorized as a food additive in the European Union (the UK banned it in 1990), and the International Agency for Research on Cancer (IARC) classifies it as a possible human carcinogen (Group 2B); unreacted residues can persist if baking conditions are not optimal.
In the United States, the FDA permits potassium bromate as a direct food additive for flour treatment under 21 CFR 137.155 at maximum levels up to 50 ppm in standardized flour. Although the FDA has historically encouraged industrial bakers to voluntarily substitute alternative dough conditioners, the ingredient remains legal under federal law, subject to recent state-level legislative phase-outs.
Potassium bromate appears primarily in commercial sliced breads, pizza doughs, rolls, and flour mixes. On packaging, it must be declared as "Potassium Bromate" or "Bromated Flour."
Azodicarbonamide (ADA) is a synthetic chemical compound used as a flour bleaching agent and dough conditioner in industrial baking, as well as a blowing agent in foamed plastics.
Azodicarbonamide is banned as a food additive in the European Union under Regulation (EC) No 1333/2008. Furthermore, European authorities prohibited ADA from food contact materials, such as jar lid gaskets, under Directive 2004/1/EC due to thermal breakdown products including semicarbazide.
In the United States, ADA is authorized by the FDA as a dough conditioner and aging agent under 21 CFR 172.806 at levels up to 45 parts per million (ppm). While many national restaurant chains and commercial bakeries have voluntarily phased out ADA, it remains approved for food use federally.
ADA is typically found in commercial sandwich breads, frozen pizza crusts, and premade pastry doughs. It appears on ingredient decks as "Azodicarbonamide" or "ADA."
Propylparaben (propyl p-hydroxybenzoate) is an ester of p-hydroxybenzoic acid utilized as a broad-spectrum antimicrobial preservative against molds and yeasts.
In 2006, the European Commission removed propylparaben from its authorized food additives list following EFSA safety assessments raising concerns regarding potential endocrine-disrupting activity and reproductive effects in animal models.
In the United States, propylparaben remains categorized as Generally Recognized as Safe (GRAS) by the FDA under 21 CFR 184.1670 at levels up to 0.1% in food. State-level chemical safety legislation has increasingly moved to prohibit propylparaben in retail food products.
Propylparaben is found in commercially packaged tortillas, baked pastries, muffin mixes, and food glazes. It is declared on ingredient lists as "Propylparaben" or "Propyl p-hydroxybenzoate."
Beyond Red 40, Yellow 5, and Yellow 6, three additional synthetic colorings complete the group known as the Southampton Six under EU Regulation (EC) No 1333/2008: Quinoline Yellow (E104), Carmoisine (also known as Azorubine, E122), and Ponceau 4R (Cochineal Red A, E124).
In the European Union, each of these three colors triggers the mandatory warning label stating they may impair activity and attention in children. Because of this requirement, European food formulators have largely eliminated them from retail packaged goods.
In the United States, these specific three dyes are not authorized as certified color additives for general food use, illustrating that regulatory restrictions flow in both directions across the Atlantic.
These dyes are found internationally in imported soft drinks, hard candies, dessert syrups, and condiment glazes. On imported packages, look for their European E-numbers (E104, E122, E124) or chemical names.
Navigating international regulatory differences does not require memorizing complex chemical codes. By understanding a few label-reading habits, you can readily inspect your household pantry:
To explore additional color additives and their transatlantic safety reviews, read our analysis on whether is blue 1 (brilliant blue fcf, e133) safe? uses and labels.
The European Union applies a precautionary regulatory approach. Following the 2007 Southampton study linking certain synthetic dyes with behavioral changes in children, the EU mandated warning labels under Regulation (EC) No 1333/2008. The US FDA concluded that existing evidence did not substantiate a broad federal warning mandate for the general population.
Under EU Regulation (EC) No 1333/2008 Annex V, foods containing any of the six specified dyes must state the name or E-number of the color followed by the exact phrase: 'may have an adverse effect on activity and attention in children.'
Yes. Multiple US states have enacted or proposed legislation restricting certain additives. For example, California passed the School Food Safety Act (AB 2316) prohibiting specific synthetic dyes in public schools, and previously banned substances like brominated vegetable oil and propylparaben at the state level.
Check the ingredient list on the back or side of the package. US regulations require direct naming of certified colors (such as FD&C Red No. 40 or Yellow 5) and chemical additives (such as Titanium Dioxide, Potassium Bromate, or Azodicarbonamide) rather than E-numbers.
Yes. In 2022, the European Commission banned titanium dioxide (E171) as a food additive under Commission Regulation (EU) 2022/63 after EFSA determined that concerns regarding genotoxicity could not be ruled out.
Yes. Because European warning requirements and bans make certain synthetic additives commercially unviable in Europe, brands frequently reformulate products for the EU market using natural colorants (like beet juice or spirulina) while continuing to use synthetic ingredients in the US.
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