Can benzalkonium chloride in disinfectant sprays act as an endocrine disruptor?
Some Concern
What's actually in it
Benzalkonium chloride (BAC) is the active ingredient in many household disinfectant sprays, surface wipes, hand sanitizers, and all-purpose cleaners. You'll also find it in some eye drops, nasal sprays, and personal care products. It kills germs on contact, but it also leaves a residue on surfaces that your skin and lungs absorb.
What the research says
A 2026 study in Bioorg Chem found that benzalkonium chloride blocks an enzyme called 11β-HSD2 in both human and rat models. This enzyme normally protects your cells from too much cortisol, the stress hormone. When it's blocked, cortisol levels in tissues rise.
Too much cortisol at the wrong time can disrupt blood pressure, blood sugar, and immune function. During pregnancy, this enzyme is especially important because it shields the baby from the mother's cortisol. Disrupting it could affect fetal development.
Switch to hydrogen peroxide-based or plant-based cleaners for daily surface cleaning. Save benzalkonium-containing products for times when you truly need strong disinfection, and always ventilate the room while using them.
The research at a glance
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