Polybutene is a clear, colorless synthetic liquid polymer that works as a binding, glossing, and thickening agent in cosmetics. Its large size makes it impossible to penetrate past skin’s uppermost layers.

References for this information:

Lipids and Cosmetics, Volume 27, June 2020, pages 1–13
Journal of the European Academy of Dermatology and Venereology, November 2019, pages 1–14
International Journal of Toxicology, Supplement 4, 2008, pages 83–106

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