The Lab
Specimen No. 0154
ClearedSyntheticemollientthickener

Polybutene

polybutene · isobutylene polymer · polyisobutylene

A light, non-drying synthetic emollient that provides gloss and viscosity in lip and eye makeup. The CIR confirmed safety as a cosmetic ingredient at concentrations up to 50%. Non-irritating, non-sensitizing, and not absorbed through skin.

low confidence
Researched April 18, 2026

Concerns

  • Petroleum-derived synthetic ingredient

Regulatory flags

  • Petroleum-derived — some environmental persistence concerns

Commonly found in

LipstickLip glossEye makeupMascara

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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