What is Squalene?
Chemically, Squalene is a lightweight emollient. The unsaturated parent of squalane, rated around 1 but prone to oxidation, which raises real-world clogging risk. Distinct from the more stable squalane.
You may see it on labels as Squalene, Shark Squalene, Shark Liver Oil, so it can hide under more than one name in an ingredient list.
Where Squalene shows up
Squalene is commonly formulated into lightweight moisturisers and 'fungal-acne-safe' formulations. Separately from clogging, its irritancy is rated 0/5 — low, so it's unlikely to sting or sensitise on its own.
Is Squalene bad for acne-prone skin?
That low score makes Squalene a reasonable choice even for acne-prone skin. As always, individual reactions vary, but it is not a likely cause of clogged pores.
Worth flagging: Squalene's rating is disputed. Credible sources land on different numbers, which is why we show a range rather than a single score — and why your own experience is the best tiebreaker.
Note for fungal-acne (malassezia) sufferers: Squalene is commonly avoided in fungal-acne routines, since it falls into the fatty-acid or ester families the yeast can feed on. The evidence there is looser than for comedogenicity — see our fungal-acne checker for context.