The short answer
In 2025 the FDA moved to ban Red Dye No. 3 from food. The ban was required by a law that bars any additive shown to cause cancer in animals, after high doses caused thyroid tumors in male rats. The FDA has stated there is no evidence that Red No. 3 causes cancer in people at the levels they consume. Other approved dyes remain under study.
In 2025 the FDA moved to ban Red Dye No. 3 from food and ingested drugs.
The ban was triggered by a law about additives that cause cancer in animals.
High doses caused thyroid tumors in male rats through a rat-specific mechanism.
The FDA says there is no evidence Red No. 3 causes cancer in people at usual intake.
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The full explanation.
The claim
After the FDA announced in January 2025 that it would revoke the use of Red Dye No. 3 (erythrosine) in food, many people concluded that artificial food dyes cause cancer. The move drew heavy news and social media coverage.
Why Red No. 3 was banned
The ban was required by the Delaney Clause, a U.S. law that bars any food additive shown to cause cancer in people or animals — even if the human risk is unclear. Red No. 3 caused thyroid tumors in male rats given high doses, through a hormonal mechanism specific to rats. The FDA has stated that studies in other animals and in people did not show the same effect, and that there is no evidence Red No. 3 causes cancer in humans.
Makers have until January 15, 2027 to take the dye out of food, and until January 18, 2028 for medicines you swallow. Products made before those dates may stay on shelves for a while after.
What this means for other dyes
The Red No. 3 decision was driven by a specific law and a specific animal finding, not by proof that dyes cause human cancer. Other approved color additives continue to be studied and reviewed. Some research has focused more on possible effects on behavior in some children than on cancer.
The bottom line
The 2025 ban of Red No. 3 reflects a strict legal standard about animal studies, not evidence that food dyes cause cancer in people at normal intake. If you prefer to limit artificial dyes, that is a reasonable choice — and it often means eating less ultra-processed food, which is sensible for other reasons. Overall diet matters far more than any single dye.
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Common questions
Do food dyes cause cancer?
The FDA says there is no evidence Red No. 3 causes cancer in people at usual intake. Its ban was triggered by a law about animal studies, not proof of human risk.
Why was Red Dye No. 3 banned then?
A U.S. law bars additives shown to cause cancer in animals. High doses caused thyroid tumors in male rats through a rat-specific mechanism.
What about other food dyes?
Other approved dyes remain under study and review; the Red No. 3 decision was specific to that dye and that law.
Should I avoid artificial dyes?
That is a personal choice. Limiting them often means less ultra-processed food, which is sensible — but overall diet matters more than one dye.
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Sources last checked: 2026-07-13 what this meansLast updated: 2026-08-11Next planned review: 2027-01-13
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Editorial review complete — This page completed Cancer Explained's editorial checks (sources, safety, plain language, duplication). It has not been reviewed by a physician or other healthcare professional.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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