Silicon dioxide

E551 is the European food-additive number for Silicon dioxide, an anti-caking agent — keeps powders free-flowing and stops them clumping. Silicon dioxide (E551) is a carrier used as a food additive.

What is E551 used for?

Silicon dioxide (E551) is an anti-caking agent — keeps powders free-flowing and stops them clumping. It is added during food production for a technological purpose rather than for nutrition.

Is E551 safe or restricted?

E551 is approved for use in the EU. It sits among the additives EFSA keeps under ongoing review as new evidence is published. Forkin classifies it as “Under monitoring” and does not make health claims. See the methodology for how regulatory levels are assigned.

Frequently asked questions about E551

What is E551?

E551 is the E-number for Silicon dioxide, an anti-caking agent — keeps powders free-flowing and stops them clumping. Silicon dioxide (E551) is a carrier used as a food additive.

What is E551 used for?

Silicon dioxide (E551) is an anti-caking agent — keeps powders free-flowing and stops them clumping. Manufacturers add it during processing rather than for nutrition. The Forkin app shows which products in your scan history actually contain it.

Is E551 vegan or vegetarian?

It depends on the source. Many additives can be produced from plant, mineral, or animal-derived raw materials, and the ingredient list rarely states which was used. The Forkin app shows the verified vegan and vegetarian status per product where it's known, instead of a blanket guess.

Is E551 safe, and is it banned anywhere?

E551 is approved for use in the EU. It sits among the additives EFSA keeps under ongoing review as new evidence is published. Forkin classifies it as "Under monitoring" and does not make health claims — see the methodology page for how regulatory levels are assigned, and the Forkin app for the full profile, including acceptable daily intake (ADI) and restrictions by country.