Last reviewed May 2026 · 1 min read
Is Aluminium Sodium Sulfate vegan?
Also known as: Soda alum, E521
E-number: E521
Vegan
Suitable for a vegan diet.
Yes — Produced synthetically from minerals.
01 · The basics
What is Aluminium Sodium Sulfate?
A mineral salt used as a firming agent and acid in baking.
02 · The source
Where it comes from
Produced synthetically from minerals. 100% vegan.
Frequently asked
FAQ
Is E521 vegan?
Yes, it is a synthetic mineral salt.
Commonly found in
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