The Lab
Specimen No. 0027
AvoidSynthetichormone disruptorpreservative

Resorcinol

resorcinol · 1,3-dihydroxybenzene · m-dihydroxybenzene

Used in hair dye and acne treatments. Classified as an endocrine disruptor by the EU — affects thyroid function and is restricted in cosmetics.

medium confidence
Researched April 18, 2026

Concerns

  • Thyroid disruptor — interferes with thyroid hormone synthesis
  • EU restricts concentration in hair dye products
  • Skin sensitization and irritation
  • Absorbed through skin — systemic effects possible

Regulatory flags

  • EU restricts in oxidative hair dye — max 0.5%; banned in other cosmetics
  • Thyroid disruption concerns at high doses

Commonly found in

Hair dyeAcne treatmentAnti-dandruff productsChemical peels

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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LabelCleared verdict badge: Resorcinol — Avoid
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