What a 3/5 rating means
On the comedogenic scale, a 3 is the moderate midpoint: tolerated by many, a possible trigger for congestion-prone skin. That puts Isostearic Acid squarely in the judgement-call zone, where your skin type and the product's formula decide the outcome.
This rating is disputed. Credible sources land on different numbers for Isostearic Acid, so we publish the range (3) rather than a false single figure. When sources disagree this openly, your own experience carries real weight.
One thing the number cannot tell you is concentration. Ingredients are listed in descending order, so Isostearic Acid near the end of a label is present in tiny amounts and matters far less than the same ingredient near the top.
About Isostearic Acid
It is a fatty acid, one of the building blocks of oils and a common texture and cleansing agent. A branched C18 fatty acid used in emollient esters, named on comedogenic lists in the moderate range.
On a label it can read as Isostearic Acid, Isostearate — worth knowing when you scan an ingredient deck.
Isostearic Acid in makeup and skincare
It shows up in cleansing balms, cream cleansers, and the base of many creams and pressed powders. Its irritancy is rated separately at 0/5, which is low.
If you deal with fungal acne (malassezia folliculitis) rather than ordinary clogged pores, note that Isostearic Acid is among the fatty-acid or ester-type ingredients that community sources commonly avoid — a separate concern from its comedogenic score, and one with weaker evidence behind it.
Lower-rated alternatives to Isostearic Acid
If you want a similar role with a friendlier comedogenic score, consider:
Isostearic Acid comedogenic FAQ
Is Isostearic Acid comedogenic?
Moderately. Isostearic Acid is rated 3/5 (moderate), the middle of the 0–5 scale: many people tolerate it, but it can contribute to breakouts on congestion-prone skin. Sources disagree on Isostearic Acid, so the rating is less settled than most.
What is the comedogenic rating of Isostearic Acid?
Isostearic Acid has a comedogenic rating of 3/5 (moderate). Of the 190 ingredients in our dataset with a published rating, 39 rate higher than Isostearic Acid, 97 rate lower, and 53 others share its 3/5. Among the 8 rated fatty acids, 1 rates higher and 4 lower. The figure is drawn from 1 cited source, listed on this page.
Is Isostearic Acid pore-clogging?
It can be for some people. At 3/5, Isostearic Acid is in the moderate band. How much it matters depends on concentration: near the top of an ingredient list it is a bigger factor than near the end. Comedogenic ratings come mostly from rabbit-ear assays and small human patch tests of the pure ingredient at high concentration, so they are a screening guide, not a prediction for your skin or a medical claim.