Compedogenicity Rating
Compedogenicity Rating — a numerical scale, typically from 0 to 5, used to estimate how likely an individual ingredient is to clog pores and contribute to comedones (blackheads and whiteheads). A rating of 0 suggests a low tendency to clog pores, while 5 suggests a high tendency, and the scores are meant as general guidance rather than a guarantee for every person.
Key points
- The scale generally runs from 0 (non-comedogenic) to 5 (highly comedogenic) for a single ingredient.
- Many ratings originate from older animal-model studies, such as the rabbit ear test, which may not fully reflect human skin.
- A rating applies to an isolated ingredient, not to a finished formula where concentration and other ingredients matter.
- Comedogenicity varies between individuals, so a higher-rated ingredient does not cause breakouts for everyone.
- The term is commonly misspelled; the underlying concept relates to comedones and comedogenicity.
Frequently asked
Does a low comedogenicity rating guarantee a product won't cause breakouts?
No; ratings apply to individual ingredients under test conditions, and a finished product's effect depends on its full formula and your unique skin, so results vary.
Where do comedogenicity ratings come from?
Many ratings trace back to older laboratory and animal-model studies, which is why they are considered a rough guide rather than a precise prediction for human skin.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
