If you are breakout-prone, you have probably searched a product name together with "comedogenic" and found three sites giving three different answers. That is no coincidence: comedogenicity is not a regulatory classification. There is no official list, no legal threshold and no approval stamp – only study evidence of varying age and quality. Here is what that evidence actually supports, and how to use the INCI list without falling for the myths.
What "comedogenic" actually means
A comedogenic ingredient tends to promote comedones – clogged pores that show up as blackheads and whiteheads, and that can trigger breakouts in acne-prone skin. A related but distinct term is acnegenic: causing inflammatory pimples. An ingredient can be one without the other, which is one reason a claim like "non-comedogenic" is less precise than it sounds.
The familiar 0–5 comedogenic ratings largely trace back to mid-20th-century animal testing – above all the rabbit-ear model (Morris & Kwan, 1983). Rabbit-ear follicles react far more dramatically than human skin, so those numbers tend to overstate real-world effects. Later work – from Fulton's 1989 re-testing of common ingredients, via Draelos & DiNardo's 2006 re-evaluation in JAAD, to Maarouf's 2018 review in JAMA Dermatology – has repeatedly made the same point: the old scale is a blunt instrument.
Flagged by studies – and cleared by studies
Some ingredients do carry published evidence of pore-clogging potential, and a handful of famous "villains" have been cleared by the same literature. The table shows both groups, as tagged in Skinimalist's ingredient data:
| Ingredient (INCI) | What studies suggest | Note |
|---|---|---|
| Isopropyl Myristate | Pore-clogging potential | The most commonly cited comedogenic emollient; frequent in light-feeling creams |
| Isopropyl Isostearate | Can clog pores and potentially cause acne | Isopropyl ester, same family as above |
| Isopropyl Stearate | Can clog pores and cause blackheads | Isopropyl ester |
| Isocetyl Stearate | May clog pores | Often advised against for acne-prone skin |
| Theobroma Cacao (Cocoa) Seed Butter | Clinically shown to clog pores | Heavy plant butter; common in body products |
| Cocos Nucifera (Coconut) Oil | Pore-clogging potential | Fine on body skin for many; riskier on breakout-prone facial skin |
| Mineral Oil (highly refined) | Non-comedogenic | Well-refined cosmetic-grade mineral oil is cleared – a persistent myth |
| Tocopheryl Acetate | Non-comedogenic | Vitamin E ester with an undeserved reputation |
| Glyceryl Behenate | Non-comedogenic | Often listed as a clogger on blogs; the data says otherwise |
Notice the pattern in the flagged group: isopropyl esters and heavy plant butters dominate. That gives you a practical shortcut when reading a label.
How to read the INCI list if you are breakout-prone
- Scan for isopropyl esters: Isopropyl Myristate, Isopropyl Palmitate, Isopropyl Isostearate and their relatives are the most consistently flagged group.
- Check the position: the INCI list is roughly ordered by concentration. A flagged ester among the top five ingredients matters far more than the same name near the end.
- Heavy butters on the face: Cocoa Butter and Coconut Oil high in the list of a facial product deserve a second thought if you clog easily – in body products they are usually unproblematic.
- Do not chase zeros: avoiding every ingredient with a nonzero rating leaves almost nothing to buy, for little proven benefit. Focus on flagged ingredients high in the list.
A note on "fungal acne"
Some people who suspect clogged pores actually have Malassezia folliculitis – often called "fungal acne" – where certain oils and fatty-acid esters feed a yeast that lives on everyone's skin. It is a related but different mechanism from classic comedogenicity, and the ingredients to avoid overlap only partly. If uniform, itchy bumps persist even though you avoid comedogenic ingredients, that distinction is worth raising with a dermatologist.
Let the app read the list for you
Names like Isopropyl Isostearate are easy to miss on a crowded label. Skinimalist reads the INCI list for you – on your device, against a database of 36,700+ ingredients and 91,200+ synonyms. Its ingredient data only tags something as pore-clogging when published studies support it, and evidence that an ingredient reduces comedones counts against the tag. In "My skin" you can set up a skin profile, for example acne-prone or oily, and see how well each scanned product matches your skin.
Check your products with Skinimalist. Scan the label or share a link – and see the score, any flagged pore-clogging ingredients and how well the product fits your skin.
Sources: Morris & Kwan (1983), rabbit-ear comedogenicity model; Fulton (1989), "Comedogenicity and irritancy of commonly used ingredients in skin care products"; Draelos & DiNardo (2006), "A re-evaluation of the comedogenicity concept", JAAD; Maarouf et al. (2018), "Myths, Truths, and Clinical Relevance of Comedogenicity Product Labeling", JAMA Dermatology. Comedogenicity is study evidence, not a regulatory classification. This guide is decision support, not medical advice.