Is cetyl alcohol comedogenic? What the pore-clogging tests found
Cetyl alcohol graded 2/5 for pore-clogging (and 2/5 for irritation) in Fulton's 1989 rabbit-ear survey at 10% in propylene glycol, which Fulton classes as borderline, and a 2007 rabbit study did not count it as positive. The higher grades that sometimes get attached to it belong to relatives: its branched form, isocetyl alcohol, scored 4/5, and its acetate ester scored 4/5.
- Label name
- Cetyl Alcohol
- Also listed as
- hexadecanol, 1-hexadecanol, palmityl alcohol
- Comedogenic grade
- 2 / 5 · Borderline (2–3) or reported positive
- Tests
-
- Fulton 1989: comedogenic 2/5, irritancy 2/5 — rabbit ear, 10% in propylene glycol
- Nguyen, Dang & Maibach 2007: negative (no grade) — rabbit ear, not stated in abstract
What the tests found
Cetyl alcohol is a straight-chain, 16-carbon fatty alcohol (1-hexadecanol). Despite the word “alcohol,” it is a waxy solid, not a drying solvent. Two published rabbit studies cover it.
Fulton (1989): 2/5 for pore-clogging, 2/5 for irritation. It was tested at Fulton’s standard 10% in propylene glycol [1] (method). Fulton’s scale reads 0-1 as not significant and 2-3 as “borderline.” An irritation score of 2 means diffuse scaling without redness.
His discussion of the alcohols explains the pattern. Short-chain alcohols cause no reaction. Mid-chain alcohols “are comedogenic and more irritating than their fatty acid analogs.” Cetyl alcohol’s C16 acid counterpart, palmitic acid, scored 2/5 for pore-clogging with no irritation, so the alcohol matches it on clogging and is worse on irritation [1].
Nguyen, Dang & Maibach (2007): not positive. This group tested 14 cosmetic materials in the rabbit ear canal and named nine as positive. Cetyl alcohol was among the five that were not [2].
The Cosmetic Ingredient Review (CIR) 1988 report adds a summary of earlier work. Citing its previous review of related alcohols, the report states that long-chain aliphatic alcohols produced minimal irritation “but no sensitization or comedogenicity in rabbits” [3].
Where the evidence is weaker (or disagrees)
The grade attached to cetyl alcohol on many lists is often borrowed from a related ingredient. Fulton’s own table shows how much a small change in chemistry matters [1]:
- Isocetyl alcohol, the branched 16-carbon form, scored 4/5 for pore-clogging and 4/5 for irritation. His Figure 3 photographs two rabbit ears side by side, one labeled cetyl alcohol and one isocetyl alcohol. The caption reads: “The branched-chain alcohol is more comedogenic and more irritating than the straight-chain alcohol.”
- Cetyl acetate, the ester of cetyl alcohol with acetic acid, scored 4/5 and 2/5. Fulton blames cetyl acetate, not the lanolin, for the poor result of acetylated lanolin alcohol.
- Cetyl palmitate, the ester with palmitic acid, scored 0/5.
The only human data found are on irritation, not comedones. The CIR report describes a 10-day test of an 11.5% cetyl alcohol cream on 80 men, applied five times a day to the forearm or lower face [3]. One subject developed redness, folliculitis and pustules, at a forearm site. Separately, formulations with up to 8.4% cetyl alcohol produced no irritation or sensitization in clinical tests [3].
None of the studies here measured comedones on human skin, where rabbit grades tend to overstate the effect [4] (why).
Where it shows up, and how much
The CIR describes long-chain alcohols like this one as emollients, emulsion stabilizers, viscosity-control agents and foam stabilizers in lotions. It notes that cetyl alcohol in particular is used “as an emollient to prevent drying and chapping of the skin” [3].
The CIR report’s use table (published 1988, from 1982 FDA filings) listed cetyl alcohol in 2,694 formulations [3]. Most were at low levels:
| Concentration range | Number of formulations |
|---|---|
| >0.1-1% | 1,022 |
| >1-5% | 1,509 |
| >5-10% | 75 |
| >10-25% | 20 |
| >25-50% | 5 |
The largest product categories were lipsticks (573), face, body and hand preparations (322), moisturizers (287) and hair conditioners (163). These figures are old. No more recent CIR use table for cetyl alcohol was found for this page.
The Panel concluded it is “safe as [a] cosmetic ingredient in the present practices of use” [3].
If you want to avoid it
No fatty alcohol in this dataset has a lower published grade. Stearyl alcohol, myristyl alcohol and cetearyl alcohol all graded 2/5 in Fulton (1989), while isocetyl and oleyl alcohol graded 4/5 [1]. Blends matter too: cetearyl alcohol combined with ceteareth-20 graded 4/5 in the same table, although each part alone graded 2/5 [1].
Among other thickening or emulsifying ingredients, these graded 0/5 for pore-clogging in the same table [1]:
- cetyl palmitate
- sucrose stearate
- PEG-100 stearate
- sorbitan stearate
Because cetyl alcohol was borderline in one rabbit study, not positive in another, and was most often reported at 0.1-5% in the 1982 FDA data, reading the rest of the label may tell you more than this one ingredient.
Sources
- Fulton JE Jr. Comedogenicity and irritancy of commonly used ingredients in skin care products. J Soc Cosmet Chem. 1989;40(6):321-333. https://library.scconline.org/v040n06/13
- Nguyen SH, Dang TP, Maibach HI. Comedogenicity in rabbit: some cosmetic ingredients/vehicles. Cutan Ocul Toxicol. 2007;26(4):287-292. https://pubmed.ncbi.nlm.nih.gov/18058303/
- Cosmetic Ingredient Review. Final Report on the Safety Assessment of Cetearyl Alcohol, Cetyl Alcohol, Isostearyl Alcohol, Myristyl Alcohol, and Behenyl Alcohol. J Am Coll Toxicol. 1988;7(3):359-413. https://www.cir-safety.org/sites/default/files/115_buff3a_suppl.pdf
- Mills OH Jr, Kligman AM. A human model for assessing comedogenic substances. Arch Dermatol. 1982;118(11):903-905. https://pubmed.ncbi.nlm.nih.gov/7138047/
Comedogenic grades describe single raw materials tested in a lab, usually on rabbit ears. They are a guide for acne-prone skin, not a prediction for any product or person, and this page is not medical advice. How the scale works.