Red 3 (Erythrosine): The Banned Food Dye

Red 3, known chemically as Erythrosine, holds a unique place in the history of American food regulation: it is the only one of the nine FDA-certified synthetic food dyes to be formally banned. In January 2025, the FDA revoked authorization for Red 3 in foods and ingested drugs, citing evidence that the dye caused thyroid cancer in laboratory animals.^[1] This action, decades in the making, represents both a regulatory milestone and a case study in how food additive policy evolves—or fails to evolve—in response to scientific evidence.

This guide examines what Red 3 is, why it was banned, where it has been used, what foods may still contain it during the transition period, and what the ban means for consumers and the broader food dye landscape.

What Is Red 3 (Erythrosine)?

Red 3, or Erythrosine, is a synthetic dye that produces a cherry-pink to red color. Unlike the azo dyes (such as Red 40, Yellow 5, and Yellow 6), Erythrosine is a xanthene dye—a different chemical class characterized by an oxygen-containing ring structure. Most significantly, Red 3 contains iodine atoms in its molecular structure, giving it an iodine content of approximately 58% by weight.^[2]

Red 3 produces a distinctive pinkish-red hue that differs from the orange-red of Red 40. It was historically prized for its bright, cherry-like color in applications where Red 40's slightly more orange tone was less desirable. The dye has excellent stability and produces consistent colors, properties that made it attractive for candy manufacturing and other applications.

Where Was Red 3 Used?

Before its ban, Red 3 appeared in a variety of food products, particularly those requiring a cherry-pink color. Common applications included maraschino cherries and other candied fruits, certain candies and confections (particularly candy corn, conversation hearts, and some gummy candies), cake decorating gels and frostings, popsicles and frozen treats, some dietary supplements and medications, and certain baked goods and decorations.^[3]

Red 3 was also permitted in pet foods, though this application was not as common. Interestingly, Red 3 had already been banned in cosmetics since 1990 due to carcinogenicity concerns—the same concerns that eventually led to its food ban 35 years later.^[4]

Important: Due to the transition period, some products containing Red 3 may still be on store shelves. Foods must be reformulated by January 15, 2027, and drugs by January 18, 2028. Until these deadlines, products manufactured before the ban may continue to be sold.

Why Was Red 3 Banned? The Scientific and Legal Case

The ban on Red 3 has a unique legal foundation: the Delaney Clause. This provision of federal law, enacted in 1958, prohibits the approval of any food additive shown to cause cancer in humans or animals.^[1] Unlike other safety determinations that allow regulators to weigh costs and benefits, the Delaney Clause operates as an absolute prohibition—if a substance causes cancer in any dose in any species, it cannot be approved for food use.

The Thyroid Cancer Evidence

The scientific evidence against Red 3 was established decades ago. In the 1980s, studies demonstrated that high doses of Red 3 caused thyroid tumors in male rats.^[5] When rats were exposed to high levels of Red 3, the dye interfered with thyroid function in ways that promoted tumor development.

Based on this evidence, the FDA banned Red 3 from cosmetics in 1990 but allowed its continued use in foods—a decision that critics found inconsistent, given that food exposure typically exceeds cosmetic exposure.

The Delaney Clause Mandate

The 2025 ban resolved this inconsistency. The FDA acknowledged that regardless of debates about human relevance, the Delaney Clause mandates revocation of any color additive shown to cause cancer in animals. The January 2025 final rule explicitly stated that the agency was required to act under this provision once the carcinogenicity evidence was established.^[1]

This legal clarity distinguishes Red 3 from other synthetic dyes. The voluntary phase-out of Red 40, Yellow 5, and the other dyes involves different types of health concerns (primarily behavioral effects) that do not trigger the Delaney Clause's mandatory revocation. The Red 3 ban was not discretionary. It was a legal requirement once the FDA acknowledged the carcinogenicity finding.

The 35-Year Delay

The lengthy gap between the 1990 cosmetics ban and the 2025 food ban has drawn criticism from consumer advocates and public health groups. For 35 years, Red 3 remained in the food supply despite carcinogenicity evidence that triggered its removal from cosmetics. The Center for Science in the Public Interest filed a petition in 2022 requesting the ban, noting the inconsistency of allowing Red 3 in foods consumed daily while prohibiting it in cosmetics applied externally.^[6]

The eventual ban, aligned with the Make America Healthy Again (MAHA) initiative's focus on removing harmful additives from the food supply, resolved this regulatory anomaly, though questions remain about why action took so long given the clear legal mandate.

International Regulatory Status

The U.S. ban on Red 3 makes America the strictest major jurisdiction for this particular dye:

United States: REVOKED as of January 2025 under 21 CFR §74.303. Foods must be reformulated by January 2027; drugs by January 2028.^[1]
European Union: Authorized as E127. The EU has severely restricted Red 3's use—it's only permitted in certain categories including cocktail cherries and candied cherries—but has not banned it entirely.^[7]
United Kingdom: Authorized under the E-number system with use restrictions similar to EU rules.
Canada: Permitted on the List of Permitted Food Colours.
Japan: Listed as a designated food additive ("Food Red No. 3").

Health Effects: What the Research Shows

Carcinogenicity

The primary health concern with Red 3 is its demonstrated ability to cause thyroid tumors in laboratory animals. Studies from the late 1980s and 1990 showed that male rats fed high doses of Red 3 developed thyroid adenomas and carcinomas at elevated rates.^[5]

The FDA has clarified that while the carcinogenicity was demonstrated in rats at doses higher than typical human exposure, the Delaney Clause does not permit dose-based exceptions. Any finding of carcinogenicity in animals triggers mandatory revocation.^[1]

Behavioral Effects

Red 3 has also appeared in some behavioral studies, though it received less attention than Red 40 or Yellow 5 in this context. The California OEHHA assessment included Red 3 among the synthetic dyes associated with potential neurobehavioral effects in children.^[8] However, the carcinogenicity concern—not behavioral effects—drove the regulatory ban.

What Consumers Should Know During the Transition

The ban on Red 3 includes a transition period to allow food manufacturers time to reformulate products. During this period:

Products may still contain Red 3: Foods manufactured before the compliance deadline (January 2027) may continue to be sold. Check ingredient labels for "Red 3," "FD&C Red No. 3," "Erythrosine," "E127," or "CI 45430."
Common sources to check: Maraschino cherries, candy corn, conversation hearts, certain popsicles, cake decorating gels, and some gummy candies were historically common sources of Red 3.
Medications require extra time: Drugs containing Red 3 have until January 2028 to reformulate. Check prescription and over-the-counter medications if avoiding Red 3 is important to you.
Pet foods may also be affected: Some pet foods contained Red 3; check labels if you're concerned about your pet's exposure.

Natural Alternatives to Red 3

Manufacturers reformulating products away from Red 3 have several natural alternatives available:

Beet juice and beet powder: An excellent replacement for Red 3's pinkish-red hue, beet-derived colorants are already widely used in natural products. They provide color along with betalain antioxidants.
Carmine (cochineal extract): This insect-derived natural red produces stable, vivid colors similar to Red 3.^[9] It's already common in applications where Red 3 was historically used. Note: not suitable for vegans and may cause allergic reactions in some individuals.
Anthocyanins from berries: Berry extracts from strawberries, raspberries, elderberries, and other red fruits can produce pink to red hues while providing antioxidant benefits.
Radish extract: Red radish concentrate produces pink colors and has become increasingly popular as a natural alternative in confectionery applications.
Hibiscus: Hibiscus flower extract produces pink to red colors and has been used traditionally in beverages and foods across many cultures.

What the Red 3 Ban Means for Food Dye Policy

The Red 3 ban carries implications beyond this single dye. It demonstrates that the FDA will act to remove color additives when legal requirements are clear, even after decades of delay. It highlights the different legal frameworks governing various types of health concerns—carcinogenicity triggers mandatory action under the Delaney Clause, while behavioral effects do not. It raises questions about why voluntary phase-out rather than mandatory bans applies to dyes with different (but still significant) health concerns.

The ban also illustrates that regulatory action is possible when political will aligns with scientific evidence. The MAHA initiative's focus on food additives helped accelerate action that had been pending for decades.

The Bottom Line

Red 3 (Erythrosine) is now a banned food dye in the United States—the only one of the nine FDA-certified synthetic colors to receive this designation. The ban, effective January 2025 with compliance deadlines extending to 2027-2028, was mandated by the Delaney Clause after decades of evidence showing the dye caused thyroid tumors in laboratory animals.

During the transition period, consumers should check labels on foods like maraschino cherries and certain candies, as well as some medications if they wish to avoid Red 3. Natural alternatives including beet extract, carmine, and berry anthocyanins offer effective replacements for manufacturers reformulating their products.

The Red 3 ban represents both a regulatory milestone and a reminder of how slowly food safety policy can move. After 35 years of allowing a carcinogenic dye in foods while banning it from cosmetics, the FDA has finally aligned its position with the scientific evidence and legal requirements. For consumers, the message is clear: this is one synthetic food dye that will no longer be part of the American food supply.