CheckVegan

Is Aluminium Sodium Sulphate vegetarian?

Aluminium Sodium Sulphate

Vegetarian Vegetarian
Vegan Vegan

Aluminium Sodium Sulphate (sodium alum) is an inorganic salt used as a firming agent and stabiliser (E521) in food products.

Also known as Aluminum sodium sulfate, Soda alum, Sodium alum, Sodium aluminium sulfate, Sodium Aluminum Sulfate
E number E521
INS number 521
CAS number 10102-71-3
EC number 233-277-3
Last reviewed 22 April 2026

An ingredient is considered vegetarian if it avoids components derived from killing an animal.

Classifications are made to the best of our knowledge based on available scientific and regulatory sources. We cannot guarantee the accuracy of every entry, errors in the sources we draw from can always occur. This tool also cannot account for cross-contamination, which depends entirely on individual suppliers and producers. If you believe a classification is incorrect, you can report an issue.

Report an issue