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Answer: Blue Dye 2 is restricted (not fully banned) in European Union (E132 permitted but less common than in US). The FDA still allows it in US food. Commonly found in: Some M&Ms varieties, Certain Jell-O flavors, Some blueberry cereals.
TL;DR: Blue Dye 2 is restricted in the EU but allowed in the US (food additives).
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Also called Indigotine. (E132)
Other names: Indigo Carmine, E132, FD&C Blue No. 2, Indigotine, CI 73015
| EU status | Restricted |
|---|---|
| US status | Allowed |
| Risk level | — |
| Where it shows up | Some M&Ms varieties, Certain Jell-O flavors, Some blueberry cereals, Grape-flavored candies, Some OTC medication capsules, Blue-tinted ice cream |
Blue Dye 2 (Indigotine/Indigo Carmine) is a synthetic disulfonated derivative of indigo. Unlike natural indigo from the indigo plant, the FD&C version is synthetically manufactured from petroleum. It produces a dark royal blue to indigo color and is used in food, pharmaceuticals, and medical diagnostics.
Blue Dye 2 provides a deep indigo-blue color to candies, beverages, and medications. It is also used clinically as a diagnostic dye for kidney function testing (ureteroscopy) and as a surgical dye marker. Its distinctive dark blue differentiates blueberry-flavored and grape-flavored products.
Animal studies conducted in the 1980s found that high-dose Blue Dye 2 caused brain tumors in male rats. An NTP bioassay (1987) found statistically significant increases in brain gliomas (astrocytomas) in male rats given high doses. The FDA reviewed these findings and determined that the doses far exceeded typical human dietary exposure. Nonetheless, the tumor finding remains in the scientific record as a concerning data point. EFSA's 2010 safety evaluation of Indigo Carmine (E132) reached an unusual conclusion: it could not establish an ADI due to data limitations, including the brain tumor findings. This means EFSA adopted an implicit conservative position — it neither declared Blue 2 safe nor formally banned it, but the absence of an established ADI signals scientific uncertainty. In medical diagnostic use, high intravenous doses of Indigo Carmine can cause hypertension, bradycardia, and in rare cases anaphylaxis. These are dose-specific clinical pharmacological effects, not relevant to dietary consumption at food use levels. Blue 2 was not included in the 2007 Lancet hyperactivity study. Limited direct research links Blue 2 to behavioral effects. The FDA's April 2025 announcement includes Blue 2 in the class of petroleum-based synthetic dyes to be phased out of the US food supply, reflecting updated policy on the category rather than specific new Blue 2 toxicity data.
For educational use only. This page summarizes the regulatory status of Blue Dye 2with citations to the primary sources below. It is not medical advice. Regulatory status is not the same as a proven health effect — read the cited sources for their exact wording, and consult a doctor for decisions about your or your family's health.
Spirulina phycocyanin, butterfly pea flower extract, and anthocyanins from blueberry, elderberry, or black carrot provide blue-to-purple natural alternatives. Grape skin extract provides purple tones. These alternatives are pH-sensitive and less stable under processing conditions.
FDA and EFSA consider Blue 2 safe at typical dietary levels, but EFSA could not establish an ADI due to data limitations including brain tumor findings in male rats. The FDA's 2025 phase-out covers Blue 2.
Indigo Carmine (Indigotine) is the chemical name for Blue Dye 2 (FD&C Blue No. 2, E132). It is a synthetic sulfonated indigo derivative producing dark royal blue. It is not the same as natural plant indigo.
Some M&Ms, certain Jell-O flavors, blueberry cereals, grape-flavored candies, some OTC medication capsules, and blue-tinted ice creams.
Yes — a 1987 NTP bioassay found statistically significant increases in brain gliomas in male rats at high doses. FDA concluded the doses far exceeded human dietary exposure. This tumor finding is why EFSA could not establish a definitive ADI for Blue 2.
No. Blue Dye 2 is synthetic sulfonated indigo designed for water solubility in food. Natural indigo from the Indigofera plant is chemically different and not approved as a food additive in the US.
Yes. The April 2025 FDA announcement includes Blue 2 in the eight petroleum-based synthetic dyes to be phased out.
Blue 2 was not specifically studied in the 2007 Lancet study. Limited individual research links it to hyperactivity. It is included in the FDA's 2025 phase-out as part of the synthetic dye class decision.
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Spirulina phycocyanin, butterfly pea flower extract (FDA-approved 2021 for certain beverages), and anthocyanin blends provide natural blue-purple alternatives. These improve with encapsulation technology.
Audited products that don't contain Blue Dye 2.
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