What a 2/5 rating means
On the comedogenic scale, a 2 is still within the non-comedogenic range that dermatologists generally consider low-risk. That places Cetyl Alcohol in the range most people, including many with acne-prone skin, tolerate well.
One thing the number cannot tell you is concentration. Ingredients are listed in descending order, so Cetyl Alcohol near the end of a label is present in tiny amounts and matters far less than the same ingredient near the top.
About Cetyl Alcohol
It is a fatty alcohol — a waxy, moisturising ingredient, not the drying kind of alcohol. A fatty alcohol (not a drying alcohol) used to soften and thicken. Rated 2/5 and considered fungal-acne safe.
On a label it can read as Cetyl Alcohol, Hexadecyl Alcohol, Hexadecan-1-Ol — worth knowing when you scan an ingredient deck.
Cetyl Alcohol in makeup and skincare
It thickens foundations, cream blushes, conditioners, and lotions. Its irritancy is rated separately at 2/5, which is low.