Stearic Acid: Comedogenic Rating & Safety Profile
Also known as: Octadecanoic Acid
A saturated fatty acid that thickens and stabilises creams. Naturally present in shea butter and cocoa butter.
Quick facts about Stearic Acid
Moderate Risk
0 = won't clog pores · 5 = highly pore-clogging
Low Risk
0 = inert · 5 = often irritating
Emulsifiers
Generally considered safe
Typically yes
Octadecanoic Acid
Quick verdict
Stearic Acid is a emulsifier with a moderate risk comedogenic profile (3/5) and low risk irritancy (1/5). A saturated fatty acid that thickens and stabilises creams. Naturally present in shea butter and cocoa butter.
What is Stearic Acid?
Stearic acid is a saturated fatty acid found naturally in shea butter, cocoa butter, animal fats and many vegetable oils. In cosmetics it is used as a thickener, emulsifier and surfactant. When saponified with a base it becomes the basis of traditional bar soaps. Cosmetic-grade stearic acid is usually plant-derived but can be sourced from animal fat — check with the brand if vegan status matters.
Comedogenic Rating: What 3/5 Means for Your Skin
Stearic acid is rated 2–3/5 comedogenic. The saturated structure means it can contribute to congestion in acne-prone leave-on facial products, particularly when it appears high in the ingredient list. In wash-off products and lower in the formula it is rarely an issue.
Benefits for skin
- Thickens and stabilises emulsions
- Soft, conditioning skin feel
- Cleansing properties when saponified (in soaps)
Potential side effects & who should avoid it
Allergy and irritation are rare. The main concern is its mild comedogenic potential in acne-prone skin.
Best for
- Dry
- Normal
- Mature
Avoid if
- Highly acne-prone (rated 3/5)
How to use Stearic Acid safely
No special precautions for most users. Acne-prone skin should choose products where stearic acid sits in the lower half of the ingredient list.
Commonly found in
Stearic acid is in moisturisers, cleansers, soaps, hair products and many cream-textured cosmetics.
Found Stearic Acid in your skincare?
Paste the full ingredient list into our INCI Analyser to see how this ingredient interacts with everything else in the formula.
Frequently asked questions
Other emulsifiers to know
Want the full picture on pore-clogging ingredients? Read our complete guide to comedogenic ingredients for the dermatology research behind the 0–5 scale and the full list of high-risk ingredients to avoid.
Written by ScanSkinAI Team · Last updated May 2026
This information is for educational purposes only. Always patch-test new products and consult a dermatologist if you have specific skin concerns.