Aluminium Silicate
The short version
Kaolin — the porcelain clay, used as an anti-caking agent and wine fining agent.
It's permitted and generally considered safe, but there are a few reasons to be mindful — like sensitivities in some people, debated studies, or intake limits. The Safety section below explains the specifics.
Where it comes from
A natural clay mineral mined from weathered granite deposits. The dominant industrial source is China (the name 'china clay' is from its historical export route). Long history of use in ceramics, paper, and traditional medicine.
How it's used
An anti-caking agent in some table salts and dry mixes, a wine and beer fining agent (adsorbs proteins and polyphenols then filters out), and a pharmaceutical excipient. Outside food, the dominant raw material in porcelain and paper coating.
Safety profile
ADI of 0–1 mg/kg body weight (combined aluminium). The crystalline aluminosilicate is largely non-absorbed in the gut; absorbable aluminium fraction is the regulatory concern. Trace heavy-metal content must meet food-grade specifications.
Physical & chemical properties
White to pale gray fine powder. Insoluble in water; settles slowly from suspension. Particle-size-dependent functional behavior.
Regulation worldwide
Permitted globally with maximum-use limits per category. Use declining in consumer products following aluminium re-evaluation.
Educational information only. Not medical or dietary advice.