Feed additive categories and functional groups under Regulation (EC) No 1831/2003
The five categories, the twenty-six functional groups of Annex I and the EU register, with no legal interpretation.
In short
A feed additive is, under Regulation (EC) No 1831/2003, a substance, micro-organism or preparation, other than a feed material or a premixture, that is intentionally added to feed or water to perform a function. It may not be placed on the market or used without an authorisation. Each authorised additive is allocated to one or more of the Regulation’s five categories, then to one or more functional groups.
- Text
- Regulation (EC) No 1831/2003, consolidated version of 27 March 2021
- Categories
- Five, in Article 6
- Functional groups
- Twenty-six, in Annex I
- Authorisation
- By regulation, for ten years, renewable
- Register
- Kept by the Commission, public (Article 17)
- Scope
- European Union; every other country has its own rules
What is a feed additive?
A function, not a staple nutrient. In animal nutrition, a feed additive is added to feed or water to do one precise thing: improve the characteristics of the feed or of animal products, meet a nutritional need, act on animal production, performance or welfare, or reduce the effect of livestock farming on the environment (Article 5(3)).
Authorisation first. No one may place on the market, process or use a feed additive that has not been authorised (Article 3). The authorisation is granted by a Commission regulation, after an opinion from the European Food Safety Authority (EFSA). It is valid for ten years throughout the Union, is renewable for ten-year periods, and the additive is then entered in the register (Articles 9 and 14).
Three basic conditions. The additive must not have an adverse effect on animal health, human health or the environment, must not be presented in a way that may mislead the user, and must not harm the consumer by impairing the distinctive features of animal products or mislead the consumer about them (Article 5(2)).
A defined scope. The Regulation leaves out processing aids and veterinary medicinal products, except coccidiostats and histomonostats used as feed additives (Article 1). Antibiotics other than these are not authorised as feed additives (Article 5(4)).
Sometimes a holder. For zootechnical additives and coccidiostats, the authorising regulation names a holder: only that holder, its legal successor or a person with its written agreement may first place the product on the market (Article 3(3)).
Products older than the Regulation. Additives already on the market under the earlier Directive stayed in the register as “existing products” until they are re-evaluated (Article 10). That is why the register still shows “E” numbers next to the current ones.
The five types of feed additives, and what they cover
The classification of feed additives, as the Regulation sets it out. The category states the function of the additive; the functional group makes it precise. An additive may fall under several categories and several groups.
| Category | What Article 6 says | Functional groups in Annex I |
|---|---|---|
| 1. Technological additives | Any substance added to feed for a technological purpose. | Fifteen, from (a) to (o): preservatives, antioxidants, emulsifiers, binders, acidity regulators, silage additives, among others |
| 2. Sensory additives | Anything that improves or changes the organoleptic properties of the feed, or the visual characteristics of food derived from animals. | Two: colourants, flavouring compounds |
| 3. Nutritional additives | The category is defined only by its groups. | Four: vitamins and pro-vitamins, compounds of trace elements, amino acids, urea and its derivatives |
| 4. Zootechnical additives | Any additive used to affect favourably the performance of animals in good health, or the environment. | Five: digestibility enhancers, gut flora stabilisers, substances which favourably affect the environment, other zootechnical additives, physiological condition stabilisers |
| 5. Coccidiostats and histomonostats | Substances intended to kill or inhibit protozoa (definition in Article 2). | No functional group |
In the register, a group is referred to by the figure of its category and its letter: “1a” for preservatives, “4b” for gut flora stabilisers. The identification numbers of authorised additives start the same way.
Technological feed additives: the fifteen groups
These are the additives that act on the feed itself: how it keeps, how it holds together, how it is made. A summary of Annex I, point 1.
| Group | What it covers |
|---|---|
| 1a · Preservatives | Protect feed against deterioration caused by micro-organisms or their metabolites. |
| 1b · Antioxidants | Extend the storage life of feed and feed materials by protecting them against oxidation. |
| 1c · Emulsifiers | Make it possible to form or keep a homogeneous mixture of phases that do not mix by themselves. |
| 1d · Stabilisers | Maintain the physico-chemical state of the feed. |
| 1e · Thickeners | Increase the viscosity of the feed. |
| 1f · Gelling agents | Give texture through the formation of a gel. |
| 1g · Binders | Increase the tendency of particles to stick together. |
| 1h · Substances for control of radionuclide contamination | Limit the absorption of radionuclides or promote their excretion. |
| 1i · Anticaking agents | Reduce the tendency of particles to stick together. |
| 1j · Acidity regulators | Adjust the pH of the feed. |
| 1k · Silage additives | Substances, enzymes or micro-organisms incorporated to improve the production of silage. |
| 1l · Denaturants | Allow the origin of certain materials to be identified in processed feed. |
| 1m · Substances for reduction of the contamination of feed by mycotoxins | Suppress or reduce the absorption of mycotoxins, promote their excretion or modify their mode of action. Group added in 2009. |
| 1n · Hygiene condition enhancers | Improve the hygienic characteristics of feed by reducing a specific microbiological contamination. Group added in 2015. |
| 1o · Other technological additives | Added for a technological purpose, with a favourable effect on the characteristics of the feed. Group added in 2019. |
Mycotoxins themselves come under other texts: the page EU mycotoxin values gives the maximum level and the guidance values.
Sensory, nutritional and zootechnical additives: the eleven other groups
A summary of Annex I, points 2 to 4. The Annex does not define the groups whose name is enough.
| Group | What it covers |
|---|---|
| 2a · Colourants | Three cases: adding or restoring colour in feed; adding colour to food of animal origin; acting on the colour of ornamental fish and birds. |
| 2b · Flavouring compounds | Increase the smell and palatability of feed. |
| 3a · Vitamins, pro-vitamins and chemically well-defined substances having similar effect | Defined by its name. |
| 3b · Compounds of trace elements | Defined by its name. |
| 3c · Amino acids, their salts and analogues | Defined by its name. |
| 3d · Urea and its derivatives | Defined by its name. |
| 4a · Digestibility enhancers | Increase the digestibility of the diet through their action on certain feed materials. |
| 4b · Gut flora stabilisers | Micro-organisms or other chemically defined substances with a positive effect on the gut flora. This is notably where the register places bacteria and yeasts fed live to animals, known in the trade as direct-fed microbials. |
| 4c · Substances which favourably affect the environment | Defined by its name. |
| 4d · Other zootechnical additives | Defined by its name. |
| 4e · Physiological condition stabilisers | Have a favourable effect on the physiological condition of animals in good health, including their resilience to stress factors. Group added in 2019. |
Last amendment to Annex I on the date of checking: Regulation (EU) 2019/962. A Commission proposal of 16 December 2025, COM(2025) 1030, would amend this Regulation among others; no adopted act has come out of it on that date.
Additive, premix, feed material, complementary feed: what are the differences?
Four terms that everyday usage blurs and that two regulations keep apart.
| Term | What it is | Where it is defined |
|---|---|---|
| Feed additive | A substance, micro-organism or preparation added to feed or water to perform a function. Subject to authorisation. | Regulation (EC) No 1831/2003, Article 2 |
| Premixture (premix) | A mixture of feed additives, or of additives with feed materials or water used as carriers, not intended to be fed directly to animals. | Regulation (EC) No 1831/2003, Article 2 |
| Feed material | A product of vegetable or animal origin, or an organic or inorganic substance, whose principal purpose is to meet animals’ nutritional needs: for example a cereal, an oilseed meal, an oil. | Regulation (EC) No 767/2009, Article 3 |
| Compound feed | A mixture of at least two feed materials, with or without additives, in the form of complete feed or complementary feed. | Regulation (EC) No 767/2009, Article 3 |
| Complete feed | Compound feed which, by its composition, is sufficient for a daily ration. | Regulation (EC) No 767/2009, Article 3 |
| Complementary feed | Compound feed rich in certain substances, sufficient for a daily ration only when used with other feed. | Regulation (EC) No 767/2009, Article 3 |
| Carrier | A substance used to dissolve, dilute or disperse a feed additive to make it easier to use, without altering its function. | Regulation (EC) No 767/2009, Article 3 |
| Processing aid | A substance used during the processing of feed for a technological purpose, residues of which may remain without any effect on the finished product. Outside the scope of the Regulation on additives. | Regulation (EC) No 1831/2003, Articles 1 and 2 |
The definitions are summarised; the text of the two Regulations prevails.
Feed additive vs feed supplement: where does the supplement fit?
Neither Regulation defines a “feed supplement”. In this framework, a product sold under that name falls under one of the definitions in the table: a feed additive, a premixture or, often, a complementary feed. What decides is not the trade name but the composition, the function and the directions for use.
The difference matters in practice. An additive refers to an authorisation, with its species and its levels; a premixture is not fed as such and has its own labelling rules; a complementary feed is fed with other feed and is labelled as a compound feed.
A mixture of authorised additives needs no further authorisation, provided the conditions of use of each one are met (Article 3(4) of Regulation 1831/2003).
The EU register of feed additives: where it is, how to read it
Article 17 of the Regulation requires the Commission to establish and keep up to date a “Community Register of Feed Additives”, available to the public: this is the list of authorised feed additives. It is consulted online, on the Commission’s Food and Feed Information Portal.
Each entry gives the identification number of the additive, its name, its category and functional group, the animal species or categories for which it is authorised, the act that authorises it with its Official Journal reference, the date of authorisation and the date of expiry. Where there is one, the holder of the authorisation is shown too.
The register separates authorised additives from those whose authorisation is being phased out, for instance because no application for renewal was submitted in time, and it flags the transitional measures in force.
The register points to the act: it is the authorising regulation, published in the Official Journal, that sets the species, the levels and the conditions of use. Before choosing an additive for a formula, that act is the text to read, in its version in force.
This register applies to the European Union. Elsewhere, each country keeps its own list, and an additive authorised here is not necessarily authorised there, or the reverse.
These categories are not the sections of this site
The products on this site are sorted by use: Feed safety and preservation, Digestion and performance, Flavours and sweeteners for Feed Solutions, and Drinking water for Farm Solutions. These are families of use, each answering a problem at the mill or on the farm, not the categories of the Regulation.
What a product is can be read on its page and confirmed on its technical data sheet. Its regulatory frame in a given country depends on the destination: ask for it with the other documents, telling us the product and the country.
Sources
- Regulation (EC) No 1831/2003 of the European Parliament and of the Council of 22 September 2003 on additives for use in animal nutrition, consolidated version of 27 March 2021 (external site)EUR-Lex · OJ L 268, 18.10.2003, p. 29 · accessed
- Regulation (EC) No 767/2009 of the European Parliament and of the Council of 13 July 2009 on the placing on the market and use of feed, consolidated version of 26 December 2018 (external site)EUR-Lex · OJ L 229, 1.9.2009, p. 1 · accessed
- Commission Regulation (EC) No 386/2009 of 12 May 2009 establishing a new functional group of feed additives (group 1m) (external site)EUR-Lex · OJ L 118, 13.5.2009, p. 66 · accessed
- Commission Regulation (EU) 2015/2294 of 9 December 2015 establishing a new functional group of feed additives (group 1n) (external site)EUR-Lex · OJ L 324, 10.12.2015, p. 3 · accessed
- Commission Regulation (EU) 2019/962 of 12 June 2019 establishing two new functional groups of feed additives (groups 1o and 4e) (external site)EUR-Lex · OJ L 156, 13.6.2019, p. 1 · accessed
- European Union Register of Feed Additives (external site)European Commission, Food and Feed Information Portal · Article 17 of Regulation (EC) No 1831/2003 · accessed
- Commission proposal for a Regulation COM(2025) 1030, which would amend Regulation (EC) No 1831/2003 among others (external site)EUR-Lex · COM(2025) 1030, 16.12.2025 · accessed
Sources checked on .
Texts read again on 7 October 2026 in the repository of the Publications Office of the European Union, which feeds EUR-Lex. This page summarises legal texts; it is not legal advice. Only the version published in the Official Journal of the European Union is authentic. Consolidated versions are documentation tools.
Frequently asked questions
Where is the list of authorised feed additives in the EU?
In the register of feed additives kept by the European Commission, provided for by Article 17 of Regulation (EC) No 1831/2003 and available to the public online. For each additive it gives the identification number, the category, the functional group, the species concerned and the act that authorises it.
How many categories and functional groups of feed additives are there?
Five categories: technological, sensory, nutritional, zootechnical, and coccidiostats and histomonostats. And twenty-six functional groups in Annex I, in its consolidated version of 27 March 2021: fifteen for technological additives, two for sensory, four for nutritional, five for zootechnical. The fifth category has no group.
What are examples of feed additives?
Preservatives, antioxidants, binders and acidity regulators are technological additives. Flavouring compounds and colourants are sensory additives. Vitamins, compounds of trace elements and amino acids are nutritional additives. Digestibility enhancers and gut flora stabilisers are zootechnical additives. Coccidiostats form a category of their own.
Can a feed additive belong to several categories or functional groups?
Yes. Article 6 of the Regulation provides that an additive is allocated to one or more categories and to one or more functional groups, according to its principal functions. Each authorisation sets its own conditions of use.
What is the difference between a feed additive and a complementary feed?
A feed additive is added to perform a function and goes through an authorisation, which sets its species and levels. A complementary feed is a compound feed, rich in certain substances, that is fed with other feed and may itself contain additives. The first comes under Regulation (EC) No 1831/2003, the second under Regulation (EC) No 767/2009.
What is a premix in animal feed?
A mixture of feed additives, or of one or more additives with feed materials or water used as carriers, that is not intended to be fed directly to animals. It is incorporated into a feed: this is the form in which many additives reach the feed mill.
How long is a feed additive authorisation valid?
Ten years, throughout the Union. It is renewable for ten-year periods, on an application to be submitted at the latest one year before it expires (Articles 9 and 14 of the Regulation).
Does Regulation (EC) No 1831/2003 apply outside the European Union?
No. It governs the placing on the market and use of feed additives in the Union. Every other country has its own rules and, often, its own positive list: an additive is checked against the rule of the country where the feed will be sold.
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