Hydrogenated Polyisobutene is a synthetic hydrocarbon emollient that imparts a smooth, non-greasy slip and forms an occlusive film to reduce transepidermal water loss. It is widely used as a lightweight alternative to mineral oil in moisturizers, lip products, and color cosmetics.
| Reported effect | How often | Notes |
|---|---|---|
| Comedogenicity / clogged pores | Rare | Generally considered low risk, but occlusive films may contribute to congestion in very acne-prone skin. |
| Contact irritation | Very rare | Considered inert and non-irritating; isolated reports only. |
| Allergic contact dermatitis | Very rare | Sensitization is exceptionally uncommon for this inert hydrocarbon. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.