Foods Containing E403 (Ammonium Alginate)
E403 (Ammonium Alginate) is the ammonium salt of alginic acid from 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 E403
E403 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 E403 is to check its ingredients list, where it must be declared by law, either as "E403" or as "Ammonium Alginate".
How to spot E403 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: E403" or "thickeners and gelling agents: ammonium alginate". In the US the E-number system isn't used, so look for the full name "Ammonium Alginate" instead.
Should you avoid foods containing E403?
E403 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 E403.
Full guide to E403: 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).