Quick Answer: Red 40 (Allura Red AC) is FDA-approved but under regulatory pressure. For most healthy adults, research shows no proven harm at typical intake levels. In children, it may worsen hyperactivity. A 2023 study linked it to DNA damage in mice. The FDA announced in April 2025 it will voluntarily phase out petroleum-based food dyes, including Red 40, by end of 2026.
Last reviewed: May 18, 2026
What is Red 40, and why is it in so many foods?
Red 40, formally called Allura Red AC or FD&C Red No. 40 (listed as E129 in Europe), is the most widely used food dye in the United States. It is a petroleum-derived synthetic colorant that gives foods a bright red, orange-red, or pink appearance.
The FDA approved it in 1971, and it has appeared in thousands of products since. You find it in:
- Fruit-flavored candy, gummies, and fruit snacks
- Breakfast cereals, particularly frosted or "berry" varieties
- Sports drinks, sodas, and fruit punch
- Flavored yogurts and dairy desserts
- Packaged cookies, cakes, and pastry filling
- Maraschino cherries
- Children's liquid medications and some adult capsules
On a label, it appears as "Red 40," "Red 40 Lake," or "FD&C Red No. 40." The "Lake" version is the oil-dispersible form used in products that cannot absorb water-based dye.
Is the FDA phasing out Red 40?
Yes. In April 2025, the FDA announced it will phase out Red 40 and seven other petroleum-based synthetic dyes from the U.S. food supply, with a target completion by end of 2026. The phase-out is structured as voluntary commitments from food companies, not a mandatory ban.
Red 40 is grouped with Yellow 5, Yellow 6, Blue 1, Blue 2, Green 3, and Orange B in this phase-out. Red 3 (erythrosine, a separate dye) had its FDA authorization revoked in January 2025 after studies linked it to cancer in male rats. Food and beverage manufacturers have until January 15, 2027 to comply with the Red 3 revocation; the deadline also covers ingested drugs (January 18, 2028).
What this means for shoppers as of May 2026: Products containing Red 40 are still legal and widely available. Full reformulation by major brands will take time. Reading the ingredients label is still the only reliable check.
Does Red 40 cause hyperactivity in children?
This is the most studied safety question, and the answer is: probably not for most children, but possibly for some, particularly those with ADHD.
The pivotal research is the 2007 McCann et al. trial published in The Lancet. Researchers gave 3-year-olds and 8/9-year-olds a mixture of food colorings (including Red 40) combined with sodium benzoate, a preservative. Parents and teachers reported increased hyperactivity compared to placebo. The UK Food Standards Agency reviewed the results and recommended precautionary warning labels. The EU adopted them: products in Europe containing Red 40 must carry the text "may have an adverse effect on activity and attention in children."
Two caveats worth knowing: the McCann study tested a mixture of dyes, not Red 40 alone. And the effect size was modest, affecting a subset of children. ADHD specialists broadly agree the dye does not create ADHD in children who do not otherwise have it. The FDA reviewed this evidence in 2011 and concluded it was not sufficient to require warning labels in the U.S.
Practical guidance: If your child shows behavioral changes after consuming brightly colored foods, a 6 to 8 week elimination trial is worth discussing with a doctor or registered dietitian.
What does recent research say about DNA damage and cancer risk?
A 2023 study published in Toxicology Reports (Zhang et al., DOI 10.1016/j.toxrep.2023.08.006) is the most direct recent evidence connecting Red 40 to cellular harm.
Researchers tested the dye both in human colorectal cancer cells (in vitro) and in mice given Red 40 via drinking water for 10 months. Results:
- Red 40 caused measurable DNA damage in human colon cells in a dose- and time-dependent pattern
- Mice consuming Red 40 at the Acceptable Daily Intake (ADI) and double the ADI showed colon DNA damage at 6 hours, 24 hours, and one week
- The dye caused colon inflammation, disrupted the gut microbiome, and promoted p53 mutations, a tumor suppressor gene
An important limit: this is animal research. No human studies have directly connected Red 40 consumption to elevated colorectal cancer rates. No regulatory body has cited this study as grounds for a ban.
There is also an older concern: Red 40 contains p-Cresidine, a compound the International Agency for Research on Cancer (IARC) classifies as possibly carcinogenic to humans. It also contains trace benzene as a manufacturing byproduct. Regulatory bodies have maintained that these trace amounts fall below risk thresholds, but the concern has resurfaced in the context of the 2025 phase-out debate.
Who is most at risk from Red 40 sensitivity?
Some people react to Red 40 without ADHD and without a formal allergy diagnosis. Symptoms can include headaches or migraines, hives or skin flushing, runny nose or watery eyes, and stomach upset.
The mechanism appears to be histamine release, not an IgE-mediated immune response. People who are aspirin-sensitive are more likely to experience cross-reactions with Red 40, because the dye shares structural similarities with compounds that trigger aspirin intolerance.
These reactions are real but not anaphylactic. An allergy skin test typically will not show a reaction to synthetic dyes. A food diary tracking dye intake and symptoms over 2 to 3 weeks is more useful for identifying sensitivity.
Why do the EU and FDA take different positions on Red 40?
They apply different thresholds for precautionary action, not different underlying science. The EU adopted mandatory warning labels after the 2007 Lancet study under a precautionary principle. The FDA reviewed the same evidence in 2011 and concluded it did not meet the bar for a required label change, applying a stricter "proven harm" standard.
The FDA's April 2025 phase-out announcement narrows that gap considerably. The U.S. is now moving to eliminate the dye, though through voluntary industry reformulation rather than mandatory labeling or an outright ban.
Some states are moving faster than the federal government. California, Virginia, West Virginia, and others have passed or are debating bills restricting synthetic dyes in school foods.
What are the natural alternatives to Red 40?
As companies reformulate, the most common replacements are:
| Alternative | Source | Notes |
|---|---|---|
| Carmine (cochineal extract) | Cochineal insects | Most color-stable; not vegan |
| Beet juice / beet powder | Beets | Vegan; fades with heat and light |
| Lycopene | Tomatoes, watermelon | Orange-red tones |
| Hibiscus extract | Hibiscus flowers | Deep pink to burgundy |
| Vegetable juice blend | Radish, red cabbage | pH-sensitive; less stable |
What to look for on a reformulated label: "carmine," "cochineal extract," "E120," "beet juice," "beet powder," or "vegetable juice." A product that previously used Red 40 and no longer does will typically show one of these.
How do you check whether your food has Red 40?
Read the ingredients list. Red 40 appears under these names:
- Red 40
- Red 40 Lake
- FD&C Red No. 40
- Allura Red AC (less common in U.S. retail; appears in technical specs)
- E129 (EU labeling)
Color on the packaging, flavor names, and "naturally flavored" claims are not reliable indicators. A red package can be dye-free. A "fruit punch" flavor can contain Red 40.
The NoJunk app scans ingredient lists directly from your phone camera and flags Red 40, Red 40 Lake, and all other synthetic dyes in the additive breakdown.
How much Red 40 is in a typical serving of candy?
The FDA sets an Acceptable Daily Intake (ADI) of approximately 7 mg per kilogram of body weight per day under 21 CFR 74.340. For a 10-year-old child weighing 30 kg, that translates to a theoretical limit of 210 mg per day. Most individual servings of candy or gummies contain far less, typically 1 to 5 mg of Red 40 per serving.
The practical concern is cumulative daily exposure. A child consuming a bowl of frosted cereal, a fruit punch drink, and a candy snack in a single day could easily approach 20 to 30 mg of Red 40, a fraction of the ADI but measurable. What makes this exposure harder to track is that Red 40 does not appear in front-of-package labeling. A parent reading a cereal box will see "fruity flavors" but not "Red 40, 8 mg per serving" without flipping to the small-print ingredient list.
Additionally, the FDA does not require manufacturers to list the quantitative amount of food coloring in products. You can see "Red 40" or "FD&C Red No. 40" in the ingredients, but not "0.5%" or "15 mg/100g." This lack of mandatory disclosure makes it harder for consumers and researchers to estimate total daily intake across the range of foods a typical child eats.
Citation: Nigg JT et al. (2012). Attention-deficit/hyperactivity disorder endophenotypes. J Am Acad Child Adolesc Psychiatry. 51(10):1003-22. doi:10.1016/j.jaac.2011.10.015.
What did the FDA and state regulators do on Red 40 in 2025?
Red 40 remains approved under 21 CFR 74.340 as of May 2026. The FDA has not revoked its authorization. However, in April 2025, the FDA announced a voluntary phase-out of Red 40 and seven other petroleum-based synthetic dyes (Yellow 5, Yellow 6, Blue 1, Blue 2, Green 3, Orange B, and Red 3) from the U.S. food supply, with a target completion by the end of 2026.
Red 3 (erythrosine, FD&C Red No. 3, E127) was revoked separately, finalized in January 2025, under the Delaney Clause. The revocation was triggered by animal studies linking Red 3 to thyroid cancer in male rats. Compliance deadline for food manufacturers is January 15, 2027; for ingested drugs, January 18, 2028. See Federal Register notice 2025-00830 for full details.
California Assembly Bill 2316, signed on September 30, 2024, prohibits the sale of foods containing Red 40, Yellow 5, Yellow 6, and Blue 1 in California schools, effective December 31, 2027. West Virginia enacted a similar school meal restriction in 2025. These state-level actions reflect growing regulatory pressure, but Red 40 remains legal in U.S. food as of 2026, though the phase-out timeline makes industry reformulation more urgent.
Is Red 40 in over-the-counter children's medication?
Yes. Red 40 is commonly used as a coloring and identifier in children's liquid medicines, particularly fever reducers and antihistamines. Ibuprofen suspension (marketed as Advil or Motrin), acetaminophen suspension (Tylenol), diphenhydramine syrups, cough and cold liquids, and chewable multivitamins frequently contain Red 40 or FD&C Red No. 40 in the inactive ingredient list.
This creates a secondary exposure pathway that many parents do not track. A child receiving a dose of ibuprofen or antihistamine syrup receives not only the active pharmaceutical ingredient but also Red 40, often without realizing it. This additive exposure is on top of any Red 40 consumed from food during the same day. For families concerned about dye sensitivity, this medication route can be significant, particularly during cold or allergy season when doses are frequent.
Dye-free product lines do exist. Many manufacturers now offer dye-free formulations of common pediatric medicines. Look for "dye-free" labeling on the front of the package or check the inactive ingredient list for the absence of FD&C Red No. 40, Allura Red, or Allura Red AC. Pharmacists can also recommend dye-free alternatives by name when you ask specifically for them.
Frequently Asked Questions
Is Red 40 banned in Europe?
No. Red 40 (E129) is approved in the EU but requires a mandatory warning label: "may have an adverse effect on activity and attention in children." There is no EU ban. The U.S. FDA announced a phase-out in April 2025, but even in the U.S. it is not banned yet.
Is Red 40 the same as Red 3?
No. Red 3 (erythrosine, FD&C Red No. 3, E127) is a structurally different dye. The FDA revoked authorization for Red 3 in January 2025 after studies linked it to cancer in male rats. Red 40 was not banned, though it is part of the broader April 2025 phase-out initiative. Products containing Red 3 can still legally appear on shelves through January 15, 2027, which is the compliance deadline for food and beverage manufacturers.
Does Red 40 cause ADHD?
No. Red 40 does not cause ADHD. Research indicates it may worsen hyperactivity in children who already have ADHD or a sensitivity to dyes, but there is no evidence it creates the condition in otherwise unaffected children.
Is Red 40 in medications?
Yes, often. Children's liquid medicines, some adult capsules, tablets, and certain vitamins use Red 40 for color and product identification. Look under "inactive ingredients" on any medication packaging.
How much Red 40 does the FDA consider safe per day?
The FDA sets an Acceptable Daily Intake (ADI) of approximately 7 mg per kilogram of body weight per day. Mean estimated U.S. adult intake is approximately 0.04 to 0.08 mg/kg/day, well below that level. Higher consumers reach roughly 0.28 mg/kg/day at the 95th percentile. The 2023 Zhang et al. mouse study used the ADI and double the ADI in its model, which suggests even permitted intake levels warrant continued study.
Is the FDA phasing out Red 40?
Yes. In April 2025, the FDA announced it will phase out Red 40 and seven other petroleum-based dyes by end of 2026 through voluntary industry commitments. Red 40 is not banned outright, but major manufacturers are pledging reformulation and the regulatory direction is clear.
Is Red 40 the same as Red Dye 40?
Yes. Red 40, Red Dye 40, FD&C Red No. 40, Allura Red AC, and E129 all refer to the same substance. The names differ by regulatory region and context, but they are chemically identical. The EU requires a warning label stating "may have an adverse effect on activity and attention in children," which the U.S. does not.
What products use Red 40 in Canada vs. the U.S.?
Red 40 is approved in both countries for the same food categories: soft drinks, candy, baked goods, dairy desserts, breakfast cereals, condiments, and fruit snacks. Health Canada requires listing as Allura Red or Red 40 on the label. U.S. versions and Canadian versions of the same product sometimes differ in dye concentration; U.S. formulations sometimes use slightly heavier dye loads than Canadian equivalents, though both fall within regulatory limits.
Which children's medicines commonly contain Red 40?
Ibuprofen and acetaminophen suspensions, diphenhydramine syrups, cough and cold liquids, and chewable multivitamins are the most common sources. Red 40 appears in the inactive ingredients toward the end of the ingredient list, used for product identification and appearance. Dye-free versions are available; look for "dye-free" on the front of the package or check for the absence of FD&C Red No. 40, Allura Red, or Allura Red AC in the full ingredient list.
The bottom line
Red 40 is approved, widely available, and in tens of thousands of products. For most healthy adults eating typical amounts, current evidence does not show clear harm.
For children, particularly those with ADHD or behavioral sensitivities, the precautionary case is stronger. The 2007 Lancet hyperactivity study, the EU warning label, and the 2023 DNA damage research together build a reasonable case for reducing exposure, even if no single study is definitive.
The bigger story in 2025 and 2026 is regulatory momentum. The FDA is moving to phase out Red 40 along with all other petroleum-based dyes. Major brands are pledging reformulation. States are acting on their own. Whether or not current safety data proves harm, the food system is moving away from this dye. Reading the label is still the fastest way to act on that right now.
Last reviewed: May 18, 2026