Resorcinol
The question

Is Resorcinol safe in hair dye?

AvoidHair dye

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

What the research flags

  • 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
EU restricts in oxidative hair dye — max 0.5%; banned in other cosmetics

Other hair dye ingredients on file

Sources & references

  1. [1]
    DatabaseIngredient database — 705549-RESORCINOL
  2. [2]
    RegulatoryInternational regulator — sccs_o_018.pdf
  3. [3]
    Peer-reviewedPubMed / NCBI — pubmed.ncbi.nlm.nih.gov · ref 22042893

Research disclaimer: Ratings reflect peer-reviewed research and regulatory assessments available at the time of publication, not the dose or formulation of any specific hair dye product. This is not medical advice.