In short“Won’t clog pores.” The FDA doesn’t define it, and there’s no standard test behind it.
Paste the ingredients of any product. The decoder puts the claim on the front next to what rabbit-ear lab tests found for each ingredient.
What “non-comedogenic”means
The word
Comedo = a clogged pore
A comedo is a pore plugged with oil and dead skin cells: closed, it’s a whitehead; open, a blackhead. “Comedogenic” means likely to cause them, “comedogenicity” is how strongly, and “non-comedogenic” is the promise that a product won’t.
The FDA’s cosmetics pages explain claims like “hypoallergenic”, “organic” and “cruelty free”. None covers “non-comedogenic”, and a 2025 review confirms the agency never defined the term. Only the general rule applies: a cosmetic label can’t be false or misleading.
Companies may run their own tests before printing the claim, but there’s no industry-wide standard. Two products with the same words on the front may have passed very different tests.
For acne-prone skin, the American Academy of Dermatology suggests sunscreen, makeup, skin and hair products labeled “oil-free”, “won’t clog pores” or “non-comedogenic”. Its hair-care page adds “non-acnegenic”.
Three kinds of tests sit behind comedogenic ratings and claims. Each answers a different question.
01 · Rabbit ear · single ingredients
The rabbit ear: fast and very sensitive
Who
3 albino rabbits per ingredient
Where
Inside one ear; the other ear is left untreated for comparison
Dose
1 ml a day, 5 days a week, for 2 weeks, usually at 10% in propylene glycol
Read-out
Follicle openings measured, plus a skin sample, graded 0 to 5
Ingredients that scored low in rabbits also looked clean in people, the author wrote, but whether high scorers always clog human pores “still remains uncertain.” A 2025 review calls the model extremely sensitive.
Fast-setting glue lifts out the pore contents so the plugs can be graded
The rabbit ear turned out more sensitive. Ingredients that only weakly clogged rabbit follicles were judged probably safe for people, possibly except for acne-prone skin.
6 people with prominent follicles who form comedones easily
Where
Patches on the upper back
How long
3 times a week for 4 weeks
Read-out
Glue samples; microcomedones counted per square inch
Products made with “comedogenic” ingredients were not necessarily comedogenic. A 2025 review adds that most comedogenicity testing happens on the back, even for products meant for the face.
Pure isopropyl myristate and acetylated lanolin clog pores. But face products usually hold them well under 15%, and at that level he saw no effect in rabbits or people (unpublished observations).
Fulton, 1989
Not convinced that lower concentrations of the worst offenders are safe. His advice to formulators: avoid them, and test every new formula.
Where they agree: an ingredient list alone can’t settle it. Only the finished product, tested, can.
US labels list ingredients from most to least, so the start of the list is what the product is mostly made of. Anything at 1% or less can follow in any order.
Isopropyl myristate, myristyl myristate and laureth-4 got a 5 in the rabbit ear; cocoa and coconut butter got a 4. Near the top of a list, one is worth a second look. See every 4 and 5, or every oil.
The AAD says breakouts from cosmetics may take anywhere from a few days to half a year to appear, and often clear once the product is stopped. A product that seems fine in week one can still be the cause later.
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Questions people ask
What does non-comedogenic mean?
It’s a claim that a product was formulated not to clog pores, so it shouldn’t cause blackheads or whiteheads. No US rule sets what a product must pass to carry it, so the brand chooses how to back it up.
Is “non pore clogging” the same thing?
Yes, it’s the same promise in plain English. In its advice for acne-prone skin, the American Academy of Dermatology puts “won’t clog pores” right next to “non-comedogenic”.
Is “oil-free” the same as non-comedogenic?
No. The AAD lists them as separate things to look for. “Oil-free” describes what was left out of the formula; “non-comedogenic” describes what the brand says the product won’t do to your pores.
Can a non-comedogenic product still give me acne?
It can. The claim isn’t standardized, and Albert Kligman, who helped build the human back test, wrote that you can’t tell from an ingredient list whether a product will cause acne: only the product’s behavior on skin counts. The AAD says acne caused by cosmetics often clears once you stop the products behind it.
What is comedogenicity?
How strongly an ingredient or product clogs pores. Lab tests grade it from 0, no plugging, to 5, severe comedones. The 1989 table’s author treated 0 and 1 as not significant, 2 and 3 as borderline, 4 and 5 as positive; a 2025 review counts 0–1 as non-comedogenic and 3 or more as significant.
Sources
18 sources · Last reviewed November 8, 2026
Grades from the 1989 and 1984 rabbit-ear papers, never estimated
Look for oil-free, won’t clog pores or non-comedogenic; acne cosmetica can take a few days to 6 months to show, and often clears when the products are stopped.
The FDA has no legal definition of the term; no regulation or industry standard for the label; most testing is on the upper back; ethylhexyl palmitate and tocopherol found in makeup sold as non-comedogenic.
The rabbit-ear method: 3 rabbits, 1 ml on the inside of one ear once a day, 5 days a week for 2 weeks, the other ear untreated; mostly 10% in propylene glycol; graded 0–5; 0–1 not significant, 2–3 borderline, 4–5 positive.
Ingredients that tested clean in rabbits appeared clean in people; whether high rabbit grades always hold in people “still remains uncertain”; the author was not convinced lower concentrations are safe; the vehicle changes the grade.
Human back test: substances under occlusion on the upper back for a month, follicles sampled with cyanoacrylate glue; the rabbit ear is more sensitive; weak rabbit results probably safe for people, maybe not for acne-prone skin.
Finished products patched on the upper backs of 6 comedone-prone people, 3 times a week for 4 weeks; “finished products using comedogenic ingredients are not necessarily comedogenic.”
Neat isopropyl myristate and acetylated lanolin are comedogenic, but face products usually hold under 15% and showed no effect (unpublished); an ingredient list can’t tell you whether a product causes acne.