Ingredient · E551

Added As An Anticaking Agent

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Source
Not animal-derived
Allergen
No
Role in food
Manufacturers add silicon dioxide to powdered foods to prevent clumping and ensure a free-flowing …

What it is

Silicon dioxide is a naturally occurring compound made of silicon and oxygen. It is found in sand and quartz. It is produced industrially by reacting sodium silicate with a mineral acid.

Why it's used

Manufacturers add silicon dioxide to powdered foods to prevent clumping and ensure a free-flowing texture. It acts as an anticaking agent, keeping ingredients from sticking together. It is commonly found in products like spices, powdered mixes, and grated cheese.

Health notes

Silicon dioxide is generally recognized as safe (GRAS) by the FDA for use as an anticaking agent. It is poorly absorbed by the body and passes through the digestive system. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated silicon dioxide and established acceptable daily intake levels. EFSA has also evaluated its safety.

Allergen info

Not a major allergen.

Products containing Added As An Anticaking Agent

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Last updated: September 28, 2026

Note: This site presents label data from USDA FoodData Central for general information. It is not medical advice. Check the package label; formulations change.