What a —/5 rating means
Because no dependable rating exists, judge Isononyl Isononanoate by how your own skin responds rather than by a number. The absence of a score is not the same as a zero — it simply means the ingredient has not been reliably tested on the classic comedogenic scale.
About Isononyl Isononanoate
It is a synthetic ester — an oil-and-alcohol reaction product engineered for a smooth, quick-absorbing slip. A light, volatile-feeling branched ester used to replace silicones for a fast, dry finish. Its C9 chains fall below the roughly C11-C24 window malassezia is thought to feed on, so it is not flagged for fungal acne. It is named on the CLEARSTEM pore-clogging ingredient list, but that list does not publish a 0-5 comedogenic score for it and no Fulton-derived table we cite carries one. We therefore leave it unrated rather than invent a number — treat the listing itself as the signal.
On a label it can read as Isononyl Isononanoate, Isononyl Isononoanoate — worth knowing when you scan an ingredient deck.
Isononyl Isononanoate in makeup and skincare
It is a workhorse of foundations, primers, sunscreens, and mascara, where a fast, silky slip sells the texture.
Isononyl Isononanoate comedogenic FAQ
Is Isononyl Isononanoate comedogenic?
There is no established answer. No source we cite gives Isononyl Isononanoate a comedogenic rating, and a missing score is not the same as a 0. If you are acne-prone, watch how your skin responds.
What is the comedogenic rating of Isononyl Isononanoate?
Isononyl Isononanoate is unrated on the 0–5 comedogenic scale. Isononyl Isononanoate is one of 26 ingredients, out of the 216 in our dataset, that none of our cited sources gives a comedogenic number, so we leave it unrated instead of guessing.
Is Isononyl Isononanoate pore-clogging?
Without a published rating we cannot say either way. Its position on the ingredient list still matters: near the end of a label it is present in small amounts.