Is Red Dye 40 Safe? FDA Ban, Health Risks & What Parents Need to Know
In January 2025, the FDA revoked authorization for Red Dye #3 — the first synthetic food dye ban in 35 years. Then came a broader announcement: six petroleum-derived colorants, including Red 40, are being phased out of the US food supply by the end of 2027. Here is what the data shows about Red 40 specifically, which products still contain it, and what parents can act on today.
Not Medical Advice
What Is Red Dye 40?
Red Dye 40 goes by several official names: FD&C Red No. 40 in US labeling, Allura Red AC in international food science contexts, and E129under the European Union's E-number system. The CAS number is 25956-17-6.
It is a synthetic azo dye — meaning it is derived from petroleum and contains a nitrogen-nitrogen double bond (the azo group) that produces its characteristic red-orange color. Red 40 replaced Red Dye #2 (Amaranth) after the FDA banned Amaranth in 1976.
Today, Red 40 is the most widely used synthetic food dye in the United States by volume, approved for use in foods, beverages, drugs, and cosmetics. The FDA classifies it as a Color Additive subject to batch certification — meaning each commercial lot must pass FDA laboratory testing before it can be used in food products.
Technical Identity
- US name: FD&C Red No. 40
- International name: Allura Red AC
- EU E-number: E129
- CAS number: 25956-17-6
- Type: Synthetic azo dye (petroleum-derived)
- Approved uses: Foods, beverages, pharmaceuticals, cosmetics
The FDA's January 2025 Ban and the 2027 Phase-Out
On January 15, 2025, the FDA revoked authorization for Red Dye #3 (Erythrosine) in food and ingested drugs. This was the first ban of a certified color additive since the FDA prohibited Red Dye #2 in 1976 — a 49-year gap. The revocation was required under the Delaney Clause, a provision of the Federal Food, Drug, and Cosmetic Act that mandates the FDA deny or withdraw approval of any additive shown to cause cancer in humans or animals. Rat studies had shown Red Dye #3 caused thyroid tumors at high doses.
In the months that followed, the FDA announced a broader initiative under HHS Secretary Robert F. Kennedy Jr. to phase out six petroleum-derived synthetic colorants from the US food supply by December 31, 2027. The six colorants subject to phase-out include:
- FD&C Red No. 40 (Allura Red AC)
- FD&C Yellow No. 5 (Tartrazine)
- FD&C Yellow No. 6 (Sunset Yellow)
- FD&C Blue No. 1 (Brilliant Blue)
- FD&C Blue No. 2 (Indigo Carmine)
- FD&C Green No. 3 (Fast Green)
The phase-out is a voluntary transition agreement between the FDA and the food industry — not a regulatory ban in the Delaney Clause sense. This distinction matters: manufacturers are not legally required to remove these dyes immediately, and enforcement mechanisms differ from an outright prohibition. However, the regulatory signal is clear, and major food companies have already begun reformulation.
Key Regulatory Timeline
- 1976: FDA bans Red Dye #2 (Amaranth).
- 1971: Red Dye 40 receives FDA approval. ADI set at 7 mg/kg body weight.
- 2007: The Lancet publishes McCann et al. study linking synthetic dyes to hyperactivity in children.
- 2011: FDA Food Advisory Committee reviews dye-hyperactivity evidence. Concludes insufficient basis for ban, but acknowledges possible effect in sensitive children.
- 2009: EFSA lowers EU ADI for Red 40 to 4 mg/kg and mandates warning labels on products containing it.
- January 2025: FDA bans Red Dye #3 under Delaney Clause.
- 2025: FDA announces voluntary phase-out of 6 synthetic dyes, including Red 40, by end of 2027.
- 2024–ongoing: EFSA initiates new genotoxicity review of Red 40.
EU vs. US: A Stark Regulatory Gap
Red 40 is permitted in both the US and the EU, but the regulatory approach could not be more different. The EU acted on the 2007 hyperactivity research by requiring a mandatory warning label. The US FDA reviewed the same data and took no label action, citing insufficient causal evidence.
| Factor | United States (FDA) | European Union (EFSA) |
|---|---|---|
| Legal status | Approved (phase-out by end of 2027 announced) | Permitted in limited categories |
| Warning label required | No | Yes — mandatory hyperactivity warning on pack |
| Acceptable Daily Intake | 7 mg/kg body weight (FDA, 1971 assessment) | 4 mg/kg body weight (EFSA, 2009 re-evaluation) |
| Recent regulatory action | FDA phase-out of 6 synthetic dyes announced 2025 | EFSA reviewing potential genotoxicity (2024–) |
| Children's foods | No restrictions beyond general approval | Discouraged; warning label mandatory |
The EU's mandatory warning — "may have an adverse effect on activity and attention in children" — effectively drove most major European food manufacturers to voluntarily reformulate away from Red 40 and the other five Southampton dyes. In the UK, Nestlé, Kellogg's, and Mars reformulated their children's products before any legal deadline. American consumers buying the same brand's products often receive a different formulation.
Which Foods Contain Red Dye 40?
Red 40 is widespread in the US food supply. It appears in products that are red, orange, or purple — and in some products where the color is not immediately obvious. Below are commonly consumed products known to contain it. Formulations change; always verify against the current ingredient list.
Doritos Nacho Cheese
Snacks
Skittles (Original)
Candy
M&Ms (Red)
Candy
Gatorade Fruit Punch
Sports drinks
Kool-Aid (most flavors)
Beverages
Lucky Charms
Cereal
Jell-O (red/orange)
Desserts
Fruit by the Foot
Snacks
Maraschino cherries
Condiments
Certain flavored yogurts
Dairy
Red velvet cake mixes
Baking
Some fruit punches and cocktail mixers
Beverages
Note: This list is illustrative, not exhaustive. Manufacturers regularly update formulations. Verify against the current ingredient label.
What the Research Shows
The scientific literature on Red 40 covers four main areas of concern: hyperactivity in children, hypersensitivity reactions, potential genotoxicity, and cancer risk. Here is where the evidence currently stands.
Hyperactivity and behavior in children
The most influential study is the 2007 McCann et al. randomized, double-blind, placebo-controlled trial published in The Lancet. Researchers tested a mixture of artificial food colors (including Red 40) combined with sodium benzoate in children aged 3 and 8–9. Both age groups showed statistically significant increases in hyperactivity scores when consuming the dye mixture compared to placebo.
Limitations of the study: it tested a cocktail of dyes plus preservative, not Red 40 alone. Isolating the individual contribution of Red 40 from the mixture is not possible from these results. A subsequent meta-analysis by Nigg et al. (2012) in Journal of the American Academy of Child & Adolescent Psychiatry estimated that synthetic food dyes account for approximately 8% of ADHD cases in children — a modest but not negligible association.
The FDA's 2011 Food Advisory Committee reviewed this body of evidence. It concluded that existing research did not demonstrate a causal link strong enough to mandate label changes or a ban, but acknowledged that a subset of children with ADHD may be sensitive to synthetic food dyes.
Hypersensitivity and allergy-like reactions
Red 40 is chemically similar to aspirin (both are salicylate compounds). People with aspirin sensitivity may experience hypersensitivity reactions including urticaria (hives), angioedema, or exacerbation of asthma. The FDA acknowledges this cross-reactive mechanism. The label "FD&C Red No. 40" is not required to include any hypersensitivity warning.
Genotoxicity
EFSA opened a new scientific assessment of Red 40's potential genotoxicity in 2024. This was prompted by newer in vitro (cell-based) studies suggesting that Red 40 and its metabolites may interact with DNA under certain conditions. EFSA has not yet completed this review. Until results are published, the existing ADI remains in force in the EU. The FDA has not opened a parallel review.
Cancer risk
Unlike Red Dye #3 — where rat studies clearly showed thyroid tumor induction, triggering Delaney Clause obligations — there is no equivalent animal carcinogenicity finding for Red 40 in the published literature at doses relevant to human exposure. The current FDA and EFSA positions do not classify Red 40 as a carcinogen. The pending EFSA genotoxicity review could change this assessment.
Bottom Line on the Research
What Parents Can Do
The 2027 phase-out will eventually remove Red 40 from most US products. Until then, parents who want to reduce exposure have practical options — none of which require eliminating entire food categories.
Read the ingredient list, not the front label
Look for "Red 40," "FD&C Red No. 40," or "Allura Red AC." It appears in the ingredient list, not the nutrition facts panel. Front-of-pack claims like "natural" do not exclude it.
Prioritize children's foods and daily staples
Occasional exposure in adults is considered low-risk by regulators. The concern centers on high-frequency consumption in children — breakfast cereals, daily snacks, flavored beverages.
Look for products that already removed it
General Mills, Mars, and Kraft Heinz have removed synthetic dyes from some product lines in response to consumer pressure. Many store-brand alternatives have switched to beet juice, annatto, or carrot extract.
Check our additive database for the full profile
We track the regulatory history, adverse event reports, and study citations for Red 40 specifically — including EFSA's 2024 genotoxicity review.
Frequently Asked Questions
Is Red Dye 40 banned?
Red Dye 40 (FD&C Red No. 40) is not currently banned in the United States. The FDA banned Red Dye #3 (Erythrosine) in January 2025. However, the FDA announced it is phasing out Red 40 along with five other petroleum-derived synthetic colorants by the end of 2027 as part of a broader regulatory shift.
What foods contain Red Dye 40?
Red Dye 40 is found in Doritos (Nacho Cheese), Skittles, Gatorade (fruit punch), Kool-Aid, Lucky Charms, Jell-O, Fruit by the Foot, maraschino cherries, certain yogurts, and many red- or orange-colored candies, snacks, and beverages. Formulations vary — always check the current ingredient label.
Is Red 40 banned in Europe?
Red 40 (Allura Red AC, E129) is technically permitted in the EU but only in specific product categories and at lower concentration limits than the US. Any EU food containing Red 40 must carry a mandatory warning: 'may have an adverse effect on activity and attention in children.' No equivalent label is required in the US. In practice, most major European food manufacturers have voluntarily removed it from children's products.
What does the research say about Red Dye 40 and ADHD?
The most cited study is the 2007 McCann et al. trial in The Lancet, which found that a mixture of food dyes (including Red 40) and sodium benzoate increased hyperactivity in children ages 3 and 8-9. The UK Food Standards Agency acted on this by urging voluntary removal. The FDA reviewed the same evidence in 2011 and concluded it was insufficient to mandate a ban, though it acknowledged a possible effect in some sensitive children.
Are there natural alternatives to Red Dye 40?
Yes. Manufacturers reformulating away from Red 40 typically use beet juice concentrate, carmine (from cochineal insects, not suitable for vegans), annatto extract, or lycopene from tomatoes. These natural colorants produce similar red and orange hues and are approved by both the FDA and EFSA. They tend to be less stable at high heat and light exposure, which is why the food industry historically preferred synthetic dyes.
Sources & References
- [1]FDA — Revocation of Authorization for Use of FD&C Red No. 3 (January 2025)
- [2]McCann D, et al. Food additives and hyperactive behaviour in 3-year-old and 8/9-year-old children. The Lancet. 2007;370(9598):1560-1567.
- [3]Nigg JT, et al. Meta-analysis of attention-deficit/hyperactivity disorder or attention-deficit/hyperactivity disorder symptoms, restriction diet, and synthetic food color additives. J Am Acad Child Adolesc Psychiatry. 2012;51(1):86-97.
- [4]EFSA — Scientific Opinion on the re-evaluation of Allura Red AC (E 129) as a food additive. EFSA Journal. 2009;7(11):1329.
- [5]FDA Food Advisory Committee — Certified Color Additives in Food and Possible Association with Attention Deficit Hyperactivity Disorder. March 2011.
- [6]FDA EAFUS Database — FD&C Red No. 40 entry (accessed 2026)
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