Squalene
Squalene
Not squalane. The unsaturated form oxidises readily, and oxidised squalene is implicated in acne.
How solid is the pore-clogging number
Squalene rates 3 of 5 — a common trigger for acne-prone skin, especially leave-on products. The rating is graded moderate. Reasonably supported, but from fewer or less direct sources than the best-established ratings.
It describes the raw ingredient in isolation. In a finished product, how much is present and where it sits in the list matter just as much. Check a whole label to see it in context.