Sodium Hypochlorite (Chlorine Bleach)
Chlorine bleach · NaOCl
What it is
The active ingredient in household bleach, an oxidizer that kills a broad range of microbes. Household bleach is roughly 3 to 6% bleach in water; most of it breaks back down into salt and water after use.
In this product: Disinfectant, sanitizer, and whitener.
Dose & route, what actually matters
Used diluted, with ventilation, and never mixed, bleach is one of the safer disinfectants available. The hazards are acute mishandling: concentrated fumes irritate the airways, mixing with ammonia makes chloramine gas, and mixing with acids (vinegar, toilet-bowl cleaner) makes chlorine gas. Both can be serious. The molecule is fine. The mistakes are the danger.
EUROPEAN UNION
Authorized disinfectant; not classified as a carcinogen at consumer use.
UNITED STATES
EPA-registered disinfectant (on List N for SARS-CoV-2); not classified as a human carcinogen for household use by IARC or EPA.
The evidence
Household bleach is sodium hypochlorite; roughly 95 to 98% of it breaks back down into salt and water, and public-health guidance treats it as a safe-when-handled-correctly disinfectant, with risks centered on fumes and mixing.
review · 2024 · source
Mixing bleach with acids (toilet-bowl cleaner, vinegar) releases chlorine gas; mixing with ammonia releases chloramine, both causing respiratory irritation and, in serious exposures, pulmonary edema.
review · 2024 · source
California Prop 65: Not listed.
How to avoid it
No need to avoid it, just respect it: dilute per the label, ventilate, and never mix bleach with anything but water. If the scent of chlorinated pool hits while you clean, you have made a gas, leave and air the room out.
Where it hides
Editorial analysis of publicly available regulatory and peer-reviewed sources. Not medical advice. We name our evidence and link it, including when an ingredient is fine.