What is Octyl Stearate?
Chemically, Octyl Stearate (INCI name: Ethylhexyl Stearate) is a synthetic emollient ester. Also called ethylhexyl stearate. Unusually, it scores the maximum on both the comedogenic and irritancy axes, making it a double flag for sensitive, acne-prone skin.
You may see it on labels as Octyl Stearate, Ethylhexyl Stearate, 2-Ethylhexyl Stearate, so it can hide under more than one name in an ingredient list.
Where Octyl Stearate shows up
Octyl Stearate is commonly formulated into lotions, sunscreens, primers, and colour cosmetics, where it adds a smooth, non-greasy slip. Separately from clogging, its irritancy is rated 5/5 — high enough to be worth noting for sensitive skin.
Is Octyl Stearate bad for acne-prone skin?
If you are acne-prone, Octyl Stearate is one to watch — especially when it appears in the first few ingredients, which means it's present at higher concentration. Lower down a long ingredient list, its practical impact drops considerably.
Note for fungal-acne (malassezia) sufferers: Octyl Stearate 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.
Non-comedogenic alternatives
If you're avoiding Octyl Stearate, these lower-risk ingredients serve a similar role and are gentler on pore-prone skin:
- Caprylic/Capric Triglyceride — rated 1/5 (Low risk).
- Squalane — rated 1/5 (Low risk).