Foods Containing E400 (Alginic Acid)
E400 (Alginic Acid) is extracted from brown seaweed, used as a thickeners & gelling agent to help thicken foods and create gels for the right texture. Here's where you're most likely to find it on food labels.
Common foods that contain E400
E400 is used across sauces, soups, desserts, jams, plant milks and dairy alternatives. The foods where it appears most often include:
- Sauces
- Soups
- Desserts
- Jams
- Plant milks and dairy alternatives
Exact usage varies by brand and recipe — the only way to know for certain whether a specific product contains E400 is to check its ingredients list, where it must be declared by law, either as "E400" or as "Alginic Acid".
How to spot E400 on a label
In the UK and EU, additives must appear in the ingredients list with their function and either their E-number or full name — for example "thickeners and gelling agents: E400" or "thickeners and gelling agents: alginic acid". In the US the E-number system isn't used, so look for the full name "Alginic Acid" instead.
Should you avoid foods containing E400?
E400 is considered safe. It is authorised across the EU, UK and US, and safety evaluations by the European Food Safety Authority (EFSA) have not identified health concerns at the levels used in food. For most people there is no reason to avoid E400.
Full guide to E400: safety, vegan and halal status →
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Additive data sourced from Open Food Facts (ODbL licence) and the European Food Safety Authority (EFSA).