E160b – Annatto (bixin, norbixin) - Food additives database

Safety grading ORANGE – SOME CONCERNS

Annatto (E160b) is a natural orange-yellow colour extracted from the seeds of the annatto tree (Bixa orellana). In both the EU and the US it is legally permitted as a food colouring, which is the baseline for its safety profile. In the EU, regulatory updates distinguish between bixin-based and norbixin-based annatto extracts because they have different toxicological properties and therefore different ADIs (Acceptable Daily Intakes). EU risk assessment work referenced in EU legislation set an ADI of 6 mg bixin/kg body weight/day and an ADI of 0.3 mg norbixin/kg body weight/day. Exposure estimates linked to proposed uses and use levels for bixin were below its ADI, but for norbixin some high-consumer scenarios reached or exceeded the ADI, particularly for infants, toddlers, and children in refined “brand-loyal” scenarios.

This is why E160b is not an automatic GREEN on this site. The additive is not banned and it is not regarded as acutely toxic at normal food levels, but the narrower ADI for norbixin and the possibility of approaching it in child populations is a meaningful risk signal. In practice, this does not mean that a single serving of annatto-coloured cheese is dangerous. It means that, for people who frequently consume multiple annatto-coloured products, especially children, the safety margin can be smaller than for many other natural colours.

A second, independent reason for an ORANGE grade is allergy. Annatto has a documented history of rare but sometimes severe hypersensitivity reactions, including urticaria, angioedema, and anaphylaxis described in case reports. These reactions appear uncommon, but they matter because they can occur quickly after ingestion and may be difficult to identify when annatto is present in processed foods.

Net judgment: Annatto is authorised and generally low risk for most people, but the combination of a low ADI for norbixin with potential high-consumer exceedances and rare severe allergic reactions supports ORANGE – SOME CONCERNS rather than GREEN.

Should You Avoid Annatto (E160b)?

You do not need to avoid annatto if you tolerate it well and your diet includes it only occasionally. Consider limiting it if a child in your household eats many brightly coloured processed foods daily, because repeated exposure across multiple products is the scenario most likely to narrow the safety margin for norbixin. You should also be cautious if you have a history of food dye reactions, unexplained hives, or previous allergic reactions after eating orange-coloured cheeses, snacks, or cereals. If you have experienced rapid-onset symptoms such as hives, swelling, wheezing, or faintness after a meal, seek medical advice and keep ingredient labels for evaluation.

Common Uses

Cheese and cheese products (cheddar-style, processed slices, spreads): creates a consistent yellow-orange colour.
Butter, spreads, and fat emulsions: restores colour variation and improves visual appeal.
Snacks (chips, extruded snacks): orange seasoning and coating colour.
Bakery and desserts: colouring of fillings, coatings, and decorative elements.
Breakfast cereals: colour adjustment in selected cereal types.
Smoked fish and seafood substitutes: helps achieve salmon-like tones in some products.
Sauces and relishes: colour standardisation, especially in pickles and chutneys.

Common names / Synonyms

Annatto
Annatto extract
Bixin (E160b(i) in the EU)
Norbixin (E160b(ii) in the EU)
INS 160b
Orlean / Roucou / Achiote (traditional names)
CI Natural Orange 4 (Colour Index name)

What is it?

Annatto is a family of colouring preparations made from the waxy outer coating of annatto seeds. The two main colouring molecules are bixin (oil-soluble) and norbixin (more water-dispersible when converted to its salts). These molecules belong to the broader carotenoid family, which helps explain why annatto produces strong yellow-to-orange shades in fatty foods such as cheese and spreads.

Manufacturing starts with annatto seeds, which are processed to release the pigments. Bixin-rich extracts are commonly obtained by solvent extraction or by aqueous processing steps that concentrate the pigment and remove plant material. Norbixin-rich extracts are typically produced by treating bixin in hot alkaline conditions, which hydrolyses bixin into norbixin. The pigment can then be precipitated and dried, or kept as potassium or sodium salts to improve dispersion in water-based systems. The final commercial ingredient may be a powder, an oil dispersion, or an alkaline aqueous solution, depending on the intended food application.

In foods, annatto’s role is primarily visual. It compensates for seasonal variability in milk fat colour, reinforces cheddar-like expectations, and standardises appearance across batches. Compared with some synthetic dyes, annatto is often marketed as a natural colour, but natural does not automatically mean risk-free. The toxicology and exposure picture differs between bixin and norbixin, which is why EU rules now treat them more explicitly. For consumers, the practical takeaway is that labels may still show annatto or E160b, but in some contexts you may also see the split forms E160b(i) and E160b(ii).

Where it’s allowed (EU vs US)

EU: Annatto colour is authorised in the EU, and current rules distinguish between Annatto bixin (E160b(i)) and Annatto norbixin (E160b(ii)) with food-category-specific conditions and maximum levels.

US: Annatto extract is a colour additive exempt from certification and permitted for use in foods under FDA colour additive regulations.

E160b – Annatto (bixin, norbixin)