Stearalkonium Hectorite is an organically modified clay (a quaternary ammonium derivative of hectorite) used in cosmetic formulations as a viscosity controller and suspending agent. It thickens and stabilizes anhydrous and oil-based systems, helping to keep pigments and other particulates evenly dispersed.
| Reported effect | How often | Notes |
|---|---|---|
Skin irritation | Rare | Mild irritation may occur in sensitive individuals, largely associated with the quaternary ammonium component. |
Allergic contact dermatitis | Very rare | Isolated sensitization reports; uncommon given its low absorption and formulation-bound use. |
Eye irritation | Rare | Possible transient irritation if products reach the eyes. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.