PlayInfoBox

Home /Education /Comedogenic Rating Scale: What It Really Means

Comedogenic Rating Scale: What It Really Means

"This oil has a comedogenic rating of 3" -- how much should you actually trust that number?

What Is the Comedogenic Rating

It is a scale, typically 0 (low) to 5 (very high), meant to describe how likely an ingredient is to clog pores and trigger comedones (clogged-pore blemishes). The concept dates back to research in the 1970s where dermatologists such as Albert Kligman applied ingredients to rabbit ears and observed the pore reaction, a method known as the rabbit ear assay.

Limits of the Scale

Because the original data came from rabbit skin, results don't always translate reliably to human facial skin, and different sources often assign different scores to the very same ingredient. There is no single internationally recognized standard, so comedogenic charts circulating online frequently disagree with each other -- treat any number as a rough tendency, not a fact.

What "Non-Comedogenic" Actually Means

The label is not a regulated or certified claim in most places -- it's closer to a marketing statement based on a manufacturer's own internal testing. A product without the label isn't necessarily pore-clogging, and one with the label isn't guaranteed to be breakout-free for everyone.

Why the Whole Formula Matters More Than One Ingredient

Even a highly comedogenic ingredient can behave differently depending on how much of it is used and what else is in the formula. Most dermatologists agree that judging a whole product by one ingredient's rating is unreliable -- how your skin actually reacts to the finished product matters far more.

Commonly Cited Tendencies

Heavy, near-solid oils like coconut oil and cocoa butter are frequently cited as higher on the scale, while lighter oils like squalane and mineral oil are often cited as lower. These are recurring patterns across multiple sources rather than fixed values, and refining methods or co-ingredients can shift real-world results.

What to Check When Breakouts Actually Happen

If a new product keeps causing breakouts, reading the full ingredient list and doing a patch test or partial-face trial is more useful than hunting for a rating chart. Introduce new products one at a time rather than several at once, and see a dermatologist if breakouts are severe or persistent.

Why the Numbers Vary So Much From Site to Site

Comedogenic ratings aren't maintained by a single authoritative body -- they're a patchwork of decades-old studies and independently compiled lists, each using its own testing method and scoring scale. On top of that, the original animal-based testing method has long been criticized for not accurately predicting how human facial skin actually responds, so it's not unusual to search the same oil on different sites and get a different number each time.

How to Actually Use This Information

The most realistic way to use a comedogenic rating is as a rough hint that an ingredient is relatively heavy and might contribute to clogged pores -- not as a guarantee either way. The more reliable test is checking the full ingredient list and trying a small amount on your own skin, since real-world reactions depend on your individual skin type far more than any single number.

Frequently Asked Questions

If an ingredient has a low rating, is it guaranteed to be safe for me?

No. Even a low comedogenic rating doesn't rule out breakouts caused by an individual sensitivity, allergy, or how the ingredient interacts with other ingredients in the formula. The rating is one reference point, not a safety certification.

Is there an official "non-comedogenic" certification?

No official government or international certification exists. "Non-comedogenic" is essentially a marketing claim based on a brand's own testing, so it's worth treating it as useful context rather than a guarantee.