The Lab
Specimen No. 0104
CautionSynthetichousehold chemicaldye

Optical Brighteners in Laundry

optical brighteners · fluorescent whitening agents · fwa

Fluorescent UV-absorbing chemicals that make whites appear brighter. They deposit on fabric and transfer to skin with wear — a concern given their potential to be skin sensitizers and endocrine disruptors.

medium confidence
Researched April 18, 2026

Concerns

  • Skin sensitization and contact allergy — particularly with sun exposure (photoallergy)
  • Potential endocrine disruption in some stilbene derivatives [inference]
  • Poor biodegradability — aquatic toxicity
  • Remain deposited on fabric through washing — continuous skin transfer

Regulatory flags

  • Some stilbene-based brighteners restricted in EU
  • Environmental persistence concerns — some bioaccumulate

Commonly found in

Laundry detergentFabric softenerPaper productsCosmetics (some)

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.

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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
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