Myrtrimonium Bromide
INCI: MYRTRIMONIUM BROMIDE
Reviewed by Rosie · Last updated 14 Aug 2026
Also known as: Myrtrimonium Bromide
A quaternary ammonium preservative that helps maintain product stability and safety
Best For Skin Types
All
Usage Frequency
As formulated in product
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What Is Myrtrimonium Bromide?
Myrtrimonium bromide is a quaternary ammonium compound (also called a quat) used primarily as a preservative in skincare formulations. It works by disrupting the cell membranes of microorganisms, preventing bacterial and fungal growth that could compromise product integrity and safety.
This ingredient is used sparingly in cosmetics—appearing in roughly 0.1% of skincare products—and is typically incorporated at low concentrations to maintain efficacy whilst minimising irritation risk.
How It Works
Myrtrimonium bromide functions as a preservative by targeting the cell membranes of bacteria and fungi. Its chemical structure allows it to penetrate and disrupt these membranes, preventing microorganisms from multiplying and degrading the product. This protective mechanism means the formula remains stable and safe for use throughout its lifespan.
Clinical Evidence & References
Research on myrtrimonium bromide's safety profile is limited within cosmetic skincare contexts. Available evidence suggests quaternary ammonium compounds are generally well-tolerated at the low concentrations used in skincare formulations. However, systemic bromide exposure (such as through oral medication) has been associated with potential adverse effects in some populations—this is not directly relevant to topical cosmetic use, where exposure is minimal and localised.
Long-term safety data specific to myrtrimonium bromide in skincare is sparse, and further research would strengthen our understanding of its tolerability profile.
How to Use
Because myrtrimonium bromide is a preservative rather than an active skincare ingredient, it requires no special application guidance. It is formulated into products by manufacturers at appropriate concentrations to maintain safety without irritating skin. Use your product as directed on the label.
Safety & Precautions
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