INCI name

CETRIMONIUM BROMIDE

Cetrimonium bromide

A quaternary ammonium salt used as a preservative and conditioning agent.

What it is

Cetrimonium bromide (hexadecyltrimethylammonium bromide) is a cationic quaternary ammonium salt. CosIng lists it as antimicrobial, antistatic, emulsifying surfactant and preservative. In the EU it is listed in Annex V (allowed preservatives).

Where it is used

Used in hair conditioners, hair masks, shampoos and some skin care products.

Limits of interpretation

The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.

See the EU regulation section for the applicable limits. The label does not show the concentration actually used.

Functions

Antimicrobial
Preventing and/or slowing down microbial growth.
Antistatic
Preventing and/or reducing static electricity by neutralising electrical charge on surfaces.
Surfactant – emulsifying
Helping suspensions or dispersions of liquids in a second liquid by reducing the surface tension of the substances to be emulsified.
Preservative
Exclusively or mainly intended to inhibit the development of micro-organisms in the cosmetic product. All authorised preservatives are substances in the positive list of Annex V to the Cosmetics Regulation 1223/2009.

EU regulation

EU · Annex V, entry 44Alkyl (C12-C22) trimethyl ammonium bromide and chloride
Maximum concentration
0.1%
As of
3 November 2026 · (EU) 2014/866

Products with this ingredient (45)

Check a full ingredient list