active
Behentrimonium Chloride
Cationic conditioning agent in prestige haircare including clean-positioned purple shampoos. Gentler profile versus older quats makes it compatible with clean-beauty ingredient frameworks.
Benefits
- Deposits on hair surface reducing friction
- Antistatic conditioning
- Emollient film on hair cuticle
- Mild preservative contribution
- Lower irritation potential than dicetyldimonium chloride
Example uses
- Purple shampoos
- Conditioning hair masks
- Scalp treatments
- Bond-repairing rinse-outs
- Leave-in conditioners
Mechanism of action
Positively charged nitrogen head group electrostatically adsorbs to the negatively charged, damaged hair cuticle surface. Long C22 behenyl tail provides hydrophobic film reducing friction coefficients, decreasing static charge, and adding slip.
Clinical evidence · Moderate
Conditioning efficacy well-characterised in hair tribology studies. Safety assessed by SCCS; low dermal sensitisation confirmed.
Effective concentration range
0.5–3% in rinse-off; 0.1–1% in leave-on
Formulation notes
Cationic — incompatible with anionic surfactants in same phase. pH 4–6 for optimal deposition.
Watchouts
Synthetic quaternary ammonium compound — flagged in some strict clean-beauty frameworks. Aquatic toxicity at higher concentrations documented.
Stacks with
Controversies & overclaims
Some brands market it as plant-derived conditioning. The behenyl chain is from rapeseed/canola oil but the quaternisation step is an industrial chemical process.
Market positioning
Sold as gentle natural-origin conditioner. Plant-oil chain origin is accurate; full industrial synthesis is not part of consumer-facing communication.
Comedogenicity
0 / 5
Sensitisation risk
Low
INCI & aliases
Behentrimonium Chloride
docosyltrimethylammonium chloride · BTMAC · BAC-22
Clean beauty perception
Accepted by most clean-beauty standards. Excluded from some quat-free formulations. Rapeseed-derived framing does not fully disclose industrial quaternisation.
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