Is Carboxymethyl Cellulose (E466) Vegan?

In frozen desserts, CMC binds free water. That slows the growth of ice crystals during storage. Without it, ice cream turns gritty. A few freeze-thaw cycles are enough. Dairy-free frozen desserts rely on it even harder, because they lack milk proteins that would otherwise do part of that work.

In gluten-free baking, CMC replaces some of the structure that gluten normally provides, holding gas bubbles and keeping crumb from collapsing. Bakers often pair it with xanthan gum or psyllium. Elsewhere it thickens sauces, stabilizes drinks that would otherwise separate, and keeps sugar syrups from crystallizing. Toothpaste uses it to hold the paste together, and artificial tears use it to keep moisture on the eye surface.

EU lists show E466 or the full name sodium carboxymethyl cellulose. United States labels usually say "cellulose gum," and pharmacy products use "carmellose sodium" or "croscarmellose sodium," a cross-linked version used to make tablets disintegrate. The neighboring numbers describe the same family of modified plant fiber: E460 cellulose, E461 methyl cellulose, E463 hydroxypropyl cellulose, E464 hydroxypropyl methyl cellulose, E465 ethyl methyl cellulose.

All are vegan. One caveat has nothing to do with sourcing. Emulsifiers of this type have drawn research attention over possible effects on the gut microbiome, and studies are ongoing. Those findings speak to how much processed food a person eats, and not to whether the additive contains animal material.