Last reviewed May 2026 · 1 min read
Is Calcium Alginate vegan?
Also known as: E404
E-number: E404
Vegan
Suitable for a vegan diet.
Yes — It is created by adding calcium to alginic acid, which is extracted directly from the cell walls of brown seaweed.
01 · The basics
What is Calcium Alginate?
A water-insoluble, gelatinous substance used as a thickener, gelling agent, and in advanced medical wound dressings.
02 · The source
Where it comes from
It is created by adding calcium to alginic acid, which is extracted directly from the cell walls of brown seaweed.
03 · Alternatives
Best vegan alternatives
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Frequently asked
FAQ
Is E404 vegan?
Yes, calcium alginate is entirely marine-plant based.
Why is it used in wound dressings?
It forms a soothing gel when it comes into contact with wound fluids, helping to heal severe burns and cuts.
Commonly found in
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Xanthan Gum (E415)
A popular food additive that helps thicken and stabilize foods.
Sodium Alginate
A natural polysaccharide extracted from brown seaweed, used as a thickener and gelling agent, especially in spherification (molecular gastronomy).
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