Guar Hydroxypropyltrimonium Chloride

Guar Hydroxypropyltrimonium Chloride is a cationic guar-derived conditioning polymer used mainly in hair care and some cleansers/lotions at low levels (typically well under a few percent) to improve slip and reduce static. As a high–molecular weight film-former, it has minimal skin penetration and generally shows low irritancy in routine-use and patch test contexts, but cationic polymers can occasionally sting or trigger mild irritation on compromised or highly reactive skin. For patient safety in eczema-prone populations, I rate it as very gentle rather than exceptionally gentle. Safety Notes: In commercial consumer haircare and conditioning systems, guar hydroxypropyltrimonium chloride is commonly used at very low levels (~0.05–0.2%) for light detangling/slip in shampoos and rinse-off cleansers, with many INCI lists reflecting sub-0.5% usage. Higher levels are seen in richer rinse-off conditioners, co-washes, and some leave-on detanglers/creams where enhanced deposition and combability are targeted, reaching about 1.0–1.5% in high-slip/high-build OTC products (above this, viscosity, tackiness, and buildup typically become limiting).