Last reviewed May 2026 · 1 min read
Is Sodium Hydroxide (E524) vegan?
Also known as: Lye, Caustic soda
E-number: E524
Vegan
Suitable for a vegan diet.
Yes — 100% mineral-based and synthetic.
01 · The basics
What is Sodium Hydroxide (E524)?
A strong base used to cure olives and glaze pretzels.
02 · The source
Where it comes from
100% mineral-based and synthetic.
Frequently asked
FAQ
Is the lye on my pretzel vegan?
Yes, it is a mineral salt product.
Commonly found in
More in this category
Other processing aid ingredients
Calcium Gluconate
A firming agent and acidity regulator.
Chitin
A fibrous substance consisting of polysaccharides, used in agriculture, winemaking, and dietary supplements (for weight loss).
Chitosan
A linear polysaccharide derived from chitin, heavily marketed in supplements as a 'fat binder' for weight loss.
Keep exploring
Related ingredients
Allura Red AC
A popular synthetic red food dye used to give foods and drinks a prominent red or pink color.
Tartrazine
A bright lemon-yellow synthetic food dye commonly used in processed foods, drinks, and medications.
Brilliant Blue FCF
A synthetic blue dye used in foods, cosmetics, and dietary supplements to achieve a vibrant blue hue.
What's next