Last reviewed May 2026 · 1 min read
Is Sodium Hydroxide vegan?
Also known as: Lye, Caustic soda, E524
E-number: E524
Vegan
Suitable for a vegan diet.
Yes — Produced synthetically from salt.
01 · The basics
What is Sodium Hydroxide?
A strong base used to cure olives and to give pretzels their brown, shiny crust.
02 · The source
Where it comes from
Produced synthetically from salt. 100% vegan.
Frequently asked
FAQ
Is the lye on my pretzel vegan?
Yes, sodium hydroxide is a synthetic mineral product.
Commonly found in
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