Dextran Hydroxypropyltrimonium Chloride

Dextran hydroxypropyltrimonium chloride is a modified polysaccharide—a large carbohydrate molecule derived from dextran, a natural polymer produced by bacteria. It has been chemically modified with hydroxypropyltrimonium groups to make it substantive (able to bind) to hair fibres.In skincare and haircare formulations, this ingredient functions as a conditioning agent. It deposits onto the hair shaft to improve texture, reduce frizz, and enhance combability without leaving residue that would weigh hair down.

The ingredient works through ionic attraction. The positively charged trimonium groups are attracted to the negatively charged surface of the hair shaft, allowing the molecule to adhere firmly to the fibre. This creates a thin conditioning film that smooths the cuticle layer.Unlike some heavier conditioning agents, dextran hydroxypropyltrimonium chloride is designed to provide conditioning benefits without excessive build-up, making it suitable for frequent use and for finer hair types that might be weighed down by traditional conditioners.

This ingredient is typically found in conditioners, leave-in treatments, and styling products rather than cleansers. It is most effective when applied to damp hair after shampooing. For best results, focus application on the mid-lengths and ends of the hair rather than the scalp, where build-up is more likely to occur. If you have very fine or thin hair, use sparingly to avoid heaviness.

Dextran hydroxypropyltrimonium chloride is generally well-tolerated and considered safe for use in haircare and cosmetic products. It is not a known irritant or sensitiser for most users.