Preservativemedium risk Common irritant
Benzalkonium Chloride
INCI · Benzalkonium Chloride
Quaternary ammonium preservative/antiseptic. Strong irritant and allergen, especially in ophthalmic and nasal products.
Why dermatologists flag it
ACDS-listed preservative/surfactant — significant irritant for eczema-prone skin
Names to look for on labels
Benzalkonium Chloride appears under any of these names — manufacturers choose between INCI, common, and local-language terms freely.
Benzalkonium ChlorideBACAlkyldimethylbenzylammonium chlorideBZK
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