A synthetic preservative regulated in Annex V.
What it is
5-Bromo-5-nitro-1,3-dioxane, also known by the trade name Bronidox, is a synthetic cyclic ether carrying a bromine atom and a nitro group. CosIng lists it as a preservative. In the EU it is listed in Annex V (allowed preservatives).
Where it is used
Found in rinse-off products such as shampoos and cleansers.
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; according to the Annex V entry, its use is restricted to rinse-off products. The label does not show the concentration actually used.
Functions
- 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 205-Bromo-5-nitro-1,3-dioxane
- Product type
- Rinse-off products
- Maximum concentration
- 0.1%
- As of
- 3 November 2026 · (EC) 2009/1223