Behentrimonium Chloride

Behentrimonium Chloride is a cationic quaternary ammonium conditioning agent used mainly in hair conditioners and detanglers (typically ~0.5–2%). Quats can cause mild irritant contact dermatitis and eye/mucosal irritation in susceptible users, especially with prolonged skin contact or on compromised barriers, though it is generally well tolerated in rinse-off formulations. Given real-world leave-on exposure from hair products and the higher reactivity risk in eczema-prone patients, a mild but non-trivial irritancy score is warranted. Safety Notes: In consumer hair-care products, behentrimonium chloride is observed at low levels (~0.1–0.3%) in lighter rinse-off conditioners, detangling sprays, and multi-ingredient conditioning systems where it functions as a secondary cationic conditioner. Typical rinse-off conditioners and masks commonly fall around ~0.5–3% actives, while the highest-strength consumer-available products (heavy creams/butters, deep conditioners, and some concentrated conditioning bases) reach about ~5–10% active, with higher levels being mainly limited by irritation potential, build-up, and formulation stability/viscosity constraints; leave-on products generally stay lower than rinse-off at equivalent sensorial targets.