The Lab
Specimen No. 0157
CautionAnimalthickener

Shellac (Cosmetic Grade)

shellac · lac resin · purified lac

A natural resin secreted by the lac beetle, used as a binder and film-former in mascara and nail products. The CIR approves concentrations up to 6% with no irritation or sensitization in controlled testing. However, clinical reports of allergic contact dermatitis in mascara users have been documented.

medium confidence
Researched April 18, 2026

Concerns

  • Allergic contact dermatitis reported in sensitive individuals using shellac-based mascara
  • Not vegan — insect-derived from lac beetles
  • Sensitization potential variable by shellac source and processing

Sourcing & processing

naturally sourced

Commonly found in

MascaraEyelinerNail polish topcoatHair sprayCandy coating

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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