The Lab
Specimen No. 0114
CautionSynthetichousehold cleanerantimicrobial

Sodium Hypochlorite (Bleach)

sodium hypochlorite · bleach · household bleach

The active ingredient in household bleach. Effective disinfectant, but generates chlorine gas when mixed with ammonia and reacts with organic matter to form trihalomethanes (THMs).

high confidence
Researched April 18, 2026

Concerns

  • Produces chlorine gas when mixed with ammonia — toxic fumes
  • Generates trihalomethanes (THMs — carcinogens) when reacting with organic material
  • Corrosive to mucous membranes at high concentrations
  • Chlorinated byproducts persist in waterways

Regulatory flags

  • Forms chloroform and other disinfection byproducts when mixed with organic matter
  • Never mix with ammonia — produces toxic chloramine gas

Commonly found in

BleachToilet bowl cleanerDisinfecting sprayLaundry whitener

Research disclaimer: This rating is based on available peer-reviewed research and regulatory assessments at the time of publication. It is not medical advice. Consult a qualified professional for personal health or skin concerns.

Check another ingredient

Search our database of scored cosmetic, food, and household ingredients — or scan a full product label.

Open the Ingredient Lab

Safer swaps · Research references

Branch Basics

Branch Basics Concentrate

96/100

One bottle replaces your entire cleaning cabinet.

Why it's cleaner

No flagged ingredients in our current review; key ingredients include Coco glucoside, Decyl glucoside, Chamomile extract.

Coco glucosideDecyl glucosideChamomile extract
View product

Embed this verdict

LabelCleared verdict badge: Sodium Hypochlorite (Bleach) — Caution
<a href="https://labelcleared.com/lab/sodium-hypochlorite-bleach"><img src="https://labelcleared.com/embed/sodium-hypochlorite-bleach/badge.svg" alt="LabelCleared verdict badge: Sodium Hypochlorite (Bleach) — Caution" height="34"></a>