The ingredient, explained
Hydrogenated Polyisobutene
A published safety assessment explicitly covers HYDROGENATED POLYISOBUTENE.
Explore connectionsIngredient guide
What it is and what it does
Hydrogenated polyisobutene is a hydrocarbon polymer. It can soften the skin surface and increase the thickness of the non-water part of a cosmetic formula.
About this ingredient: CIR published assessment: Polyene identities and formulation functions ↗
A verified formulation role is not on file for this name.
A closer look
What the research shows
Safety assessment
Patch tests of tested formulations showed no reactions beyond slight erythema.
What this does not tell us
Published safety assessment, not an efficacy trial. Its conclusion is limited to the reported cosmetic uses and concentrations, and relies partly on group read-across where individual data are missing. It does not establish current regulatory status or guarantee tolerance for every formulation.
Sources for this summary. PubMed 19101833 ↗
Research review checked Oct 1, 2026
Read exact local candidate abstracts first; select identity-relevant papers; targeted primary PubMed/publisher searches. This is not an exhaustive systematic review.
Ingredient research is not proof that a product containing this ingredient works.
Read the 1 selected study
Safety assessment
Final report of the cosmetic ingredient review expert panel on the safety assessment of Polyisobutene and Hydrogenated Polyisobutene as used in cosmetics. ↗
International journal of toxicology · 2008
Follow the formula
Products containing this ingredient
From the Serenfold edit. Linked by the ingredient list, without an efficacy ranking.
Names and identifiers
- INCI name on ingredient lists
- HYDROGENATED POLYISOBUTENE
Sources for this ingredient record
- CIR published assessment: Polyene identities and formulation functions ↗ · Recorded Sep 30, 2026
- Official product ingredient declaration ↗ · Recorded Aug 15, 2026