What is E 400?
E 400 is the E number of Alginic acid. Thickener and gelling agent from brown seaweed. It is used in desserts, sauces and ice cream.
What is E 400 used for?
E 400 belongs to the group "Other additives" and is used as thickener, gelling agent, stabiliser.
- Thickener: Thickeners increase the viscosity of a food.
- Gelling agent: Gelling agents give a food texture through the formation of a gel.
- Stabiliser: Stabilisers maintain the physical state of a food, such as an even mixture or colour.
Which foods may contain E 400?
According to the European Commission's database, E 400 may be used in 72 food categories and subcategories, each only in specific products and usually with maximum levels. The categories come from these areas:
- Dairy products and analogues
- Fats and oils and fat and oil emulsions
- Edible ices
- Fruit and vegetables
- Confectionery
- Cereals and cereal products
- Bakery wares
- Meat
- Fish and fisheries products
- Eggs and egg products
- Sugars, syrups, honey and table-top sweeteners
- Salts, spices, soups, sauces, salads and protein products
- Foods for specific groups (infants, young children, special medical purposes)
- Beverages
- Ready-to-eat savouries and snacks
- Desserts
- Food supplements
- Processed foods not covered by categories 1 to 17
Is E 400 vegan?
Usually yes: the substance is normally made from plant, mineral or synthetic raw materials or with microorganisms. In individual cases, only the manufacturer or a vegan label can give certainty.
Is E 400 linked to genetic engineering?
No typical link to genetic engineering is known for this substance: it is not usually obtained from plants for which GM varieties exist, nor produced by fermentation.
How does E 400 appear on the label?
In the list of ingredients, the substance appears with its function, followed by the E number or the name, for example "Thickener: E 400" or "Thickener: Alginic acid".
Sources
- Regulation (EC) No 1333/2008, consolidated version of 18.08.2026, Annexes I and II, EUR-Lex
- Food Additives Database, European Commission (accessed 19 October 2026)