Synthetic magnesium silicates
An effective, safe, and inert anti-caking agent.
- Category
- Anti-caking agents
- Vegan
- Yes
- Vegetarian
- Yes
What it is
A synthesized mineral compound used to prevent powders from clumping.
How it is used in food
A manufactured, high-purity anti-caking agent whose fine, porous particles absorb moisture and oils, keeping salt, seasoning powders and vending-machine drink mixes flowing freely.
Commonly found in- Spice mixes
- Dietary supplements
Health and safety
Passes unabsorbed through the gut and is entirely safe.
EFSA's 2018 silicate re-evaluation found synthetic magnesium silicate to be insoluble, unabsorbed and of no toxicological concern at reported uses. Animal studies show it transits the gastrointestinal tract intact, and the regulatory focus is on tightening purity specifications rather than on any observed adverse effects.
Regulatory status
| Region | Status | Notes |
|---|---|---|
| Australia & New Zealand FSANZ |
Permitted | Permitted under the FSANZ Food Standards Code. |
| European Union EFSA / European Commission |
Permitted | Authorised for food use under EU regulations (Annex II). |
| United States FDA (Food and Drug Administration) |
Permitted | Authorised for food use by the FDA (often GRAS for standard additives). |
Identification on labels
- E-number
- E553a
Worth knowing
Being synthesised from purified magnesium salts and sodium silicate rather than mined, it sidesteps the natural-mineral impurity concerns (such as asbestos contamination of talc deposits) that apply to its quarried cousins.
Conclusion
An effective, safe, and inert anti-caking agent.
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Open the appEntry last reviewed 2026-07-28.
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