Silica Gel / Silicon Dioxide — Hidden Processing Agent — Is It Vegan?

Vegan status: Vegan

Also known as: Amorphous silicon dioxide, E551, Diatomite silica, Kieselgel

Source

Produced synthetically from sodium silicate (water glass) or naturally from diatomaceous earth. Both synthetic and natural forms are entirely inorganic.

Used in

Wine fining and clarification (removes proteins, tannins, and heat-unstable compounds), beer clarification, food anti-caking agent (E551 in powdered foods, spices, salt), moisture absorption packets.

Appears on label: No. E551 must be declared in powdered food ingredients where it is used as an anti-caking agent.

How to avoid

No need to avoid — silica gel is vegan.

Notes

Silica fining is one of the most common wine clarification methods — often used in combination with bentonite or other fining agents. The 'do not eat' packets found in shoe boxes and electronics are silica gel (silicon dioxide) — entirely vegan and non-toxic (though indigestible and unpleasant). Not to be confused with diatomaceous earth, which is mechanically similar but different in structure.