Rheology modifier
QUATERNIUM-18 BENTONITE
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
Organic-modified bentonite clay used to thicken and stabilise oil-based cosmetics including sunscreens, foundations, and lipsticks. Long-standing CIR-reviewed safety profile when used in finished cosmetic products.
Skin benefits
- Effective rheology modifier in anhydrous and oil-based cosmetics
- Improves pigment suspension in colour cosmetics
- Provides smooth application in sunscreens and foundations
- Long history of safe cosmetic use
Known concerns
- Inhalation risk for loose powder products containing nanoscale clay particles
- Possible heavy metal trace contaminants from natural bentonite source
- Quaternary ammonium portion can be mildly irritating to eyes
- Sourcing variability
References
EU CosIng database
European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.
Related rheology modifiers
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.