Vegan
How we decideDiatomaceous earth is vegan. Miners quarry the fossilized silica skeletons of diatoms, microscopic single-celled algae, and most of the world's large breweries push beer through the powder to reach bright clarity. The filter cake comes out before packaging and never appears on a label.
Not required on labels
A vegan processing aid. Does not appear on labels and does not affect vegan status.
- Source
- Formed from the fossilized silica skeletons of diatoms — microscopic single-celled algae. Mined from geological deposits. No animal products involved.
- Used In
- Beer filtration (used in pressure filtration to achieve crystal clarity), wine filtration, fruit juice clarification, edible oil refining, pharmaceutical liquid filtration. Also used in food storage (insect control), pest control, and pool filtration.
- How to Avoid
- No avoidance needed — diatomaceous earth is vegan. As an algae-derived mineral filter, it is one of the cleanest processing aids in food production.
Editorial Notes
Food-grade diatomaceous earth (distinguished from the pool-grade form which is chemically treated) is sometimes consumed directly as a health supplement, though evidence for this is limited. As a beer filter medium, it is fully removed after filtration. Used by the majority of large-scale breweries globally.
In depth
Where It Comes From and How It Is Processed
Diatomaceous earth is a sedimentary mineral formed from the accumulated silica cell walls of diatoms, single-celled algae that lived in ancient oceans and lakes. Over millions of years, these microscopic skeletons settled and compacted into a soft, chalk-like rock called diatomite. Open-pit mines work it today in several countries, including the United States, Denmark, and China.
After mining, the rock is crushed, dried, and milled into a fine powder. Food-grade diatomaceous earth undergoes relatively little further processing and consists mostly of amorphous silica. The grades used as beverage filter aids are often calcined to improve flow characteristics during filtration. Calcining means heating at high temperature, sometimes with a fluxing agent. It converts a portion of the silica to a crystalline form. Crystalline silica is a respiratory hazard for workers handling the dry powder. The finished beverage is unaffected, since the material is removed before packaging.
The raw material is fossilized algae. The processing is purely mechanical and thermal. No animal inputs are involved at any stage of production.
Why It Never Appears on Labels
Diatomaceous earth functions as a filter aid. Producers coat it onto filter screens or dose it directly into a liquid, where its porous particles trap yeast, haze proteins, and other suspended solids. The spent filter cake carries away the earth and everything it captured, and the whole lot is discarded. None of it is intended to remain in the finished product. Food regulations in both the United States and the European Union therefore treat it as a processing aid, not an ingredient. Processing aids are exempt from ingredient labeling.
A consumer therefore cannot tell from a label whether a beer, wine, or juice was filtered through diatomaceous earth. For vegans this particular gap is harmless, since the material is mineral and algal in origin. The same labeling exemption, however, also covers animal-derived fining agents such as isinglass and gelatin. Label reading alone cannot resolve the vegan status of filtered beverages. That is why producer-verification databases exist for beer and wine.
Products Where It Is Commonly Used
Brewing is one of the largest food applications: kieselguhr filtration has been standard practice in commercial breweries for over a century and remains the dominant clarification method at large-scale plants. Wine, cider, and fruit juice producers use it for the same purpose, and it also appears in the refining of edible oils, sugar syrups, and sweeteners, where it strips out fine particulates.
Outside of direct food processing, diatomaceous earth filters pharmaceutical liquids and fermentation broths, works as an anti-caking agent in animal feed, and serves as a mechanical insecticide in grain storage. The abrasive particles kill insects by desiccation. No chemical action is involved. Swimming pool filtration relies on a separate calcined grade that is not food-safe.
A historical footnote: kieselguhr was the absorbent Alfred Nobel used to stabilize nitroglycerin when he invented dynamite in the 1860s. None of these applications involves animal-derived material.
Alternatives and Industry Trends
Diatomaceous earth is itself vegan. No one needs an alternative for animal-welfare reasons. The industry is nonetheless gradually moving away from it for operational reasons. The spent filter cake is bulky waste that is costly to dispose of. The dry calcined powder poses an inhalation hazard for workers because of its crystalline silica content.
The main replacements are perlite (a milled volcanic glass with similar filtration behavior), cellulose-based filter sheets, and regenerable synthetic filter media. The most significant shift is toward cross-flow membrane filtration, which forces the liquid through fine polymer membranes and eliminates powdered filter aids entirely. Membrane systems require higher upfront investment but produce less waste and remove the occupational exposure issue, and a growing number of large breweries have adopted them.
All of these alternatives are mineral, plant, or synthetic in origin. The choice between them is an engineering and cost decision, not an ethical one.
Frequently asked questions
Is diatomaceous earth vegan?
Yes, diatomaceous earth is vegan. The material is a mined mineral formed from the fossilized silica skeletons of diatoms, which are single-celled algae, not animals. No animal-derived materials are used in its extraction or processing.
Is diatomaceous earth in beer?
Many commercially produced beers are filtered with it. None of it remains in the finished product. The powder traps yeast and haze particles and is then removed along with them before packaging. Diatomaceous earth is vegan and fully removed, so it does not affect the vegan status of beer.
Why doesn't diatomaceous earth appear on ingredient lists?
Because it is classified as a processing aid, not an ingredient. Filtration removes it from the product. Both US and EU regulations exempt processing aids from ingredient labeling. The same exemption applies to animal-derived filter and fining agents, which is why labels alone cannot confirm whether a filtered beverage is vegan.
What is kieselguhr?
Kieselguhr is the German name for diatomaceous earth. The brewing industry uses it most often. Kieselguhr filtration and diatomaceous earth filtration refer to the same process. The material is identical: a powdered mineral derived from fossilized algae.
Is food-grade diatomaceous earth the same as pool filter DE?
No. Pool-grade diatomaceous earth is calcined at high temperatures, which converts much of its silica to a crystalline form. Inhaling crystalline silica dust is a recognized respiratory hazard, and pool-grade material is not manufactured to food-grade purity, so it should never be consumed. Food-grade diatomaceous earth consists mostly of amorphous silica and is the grade permitted for direct food use. The two are not interchangeable.
Is it safe to eat diatomaceous earth?
Food-grade diatomaceous earth is permitted in food production as a filter aid, and trace residues are considered safe by regulators. Retailers also sell it as a dietary supplement. The health claims attached to it are not well supported by evidence. Inhaling the dry powder should be avoided with any grade, and pool-grade material should never be consumed.