What is E400?

Alginic acid, also called algin, is a naturally occurring, edible polysaccharide found in brown algae. It is hydrophilic and forms a viscous gum when hydrated. E400 sits in the E400–E499 series, which in the EU classification mainly covers thickeners, stabilisers and emulsifiers.

What is E400 used for?

E400 belongs to the thickeners group. Thickeners and gelling agents give food texture and body. Many come from plants, like pectin and guar gum.

Is E400 safe?

E400 is considered safe at the levels used in food and is approved for use in the EU. “Safe” means it is approved in the EU and regarded as safe at the levels used in food.

How E400 appears on labels

On food packaging you'll find E400 either as the number “E400” or by the name “Alginic acid” in the ingredient list, often after its function. Ingredients are listed in descending order by weight, so an additive near the end is present only in small amounts.

Is E400 vegan?

Yes, E400 is suitable for vegans.