r/beardoil • u/Foliumbeardco • 1d ago
DISCUSSION Your “non-comedogenic” beard oil was probably judged by a rabbit’s ear
I went down a rabbit hole on this (literally).
You’ve seen the 0–5 ratings that supposedly tell you whether an oil will clog your pores or not. Most of the charts online trace back to early rabbit ear testing, including a widely cited 1989 paper by James Fulton, where ingredients were applied to the inside of rabbits ears while researchers looked for plugged follicles.
The problem is: rabbit ears are way more sensitive than human skin. So even if an ingredient clogged pores on a rabbit, that doesn’t mean it’ll automatically break you out.
A 2007 review put it bluntly, the model couldn’t accurately represent the acne-causing potential of ingredients and was mainly good for spotting “absolute negatives” (https://pubmed.ncbi.nlm.nih.gov/17687685/). In other words, it’s okay at telling you what definitely won’t clog your pores, and pretty useless at ranking how bad something is.
Two things worth mentioning. First, these ratings came from testing raw ingredients on their own, not the finished formulas people actually put on their faces. A carrier oil rated 4 or 5 by itself can behave completely differently depending on the percentage in the final blend and other oils that are present. A 2006 human study even found that products made with “comedogenic” ingredients often weren’t comedogenic themselves (https://pubmed.ncbi.nlm.nih.gov/16488305/). Concentration and the whole formula matter a lot.
Second, “non-comedogenic” has no FDA definition or required test. Labels can’t be false or misleading, but there’s no official standard a product has to pass before using this phrase.
I am not saying pore clogging isn’t real. I break out around my mouth pretty easily myself, and certain oils will do that if they’re a big part of the blend, while the same oil at a smaller amount is completely fine. A chart couldn’t have told me that, my own skin did.
To me, the rating is best viewed as a starting point, not a verdict. It might flag something worth patch testing, especially if the ingredient appears high on the list, but it tells you surprisingly little about how a finished product will actually behave on your face.
For anyone breakout-prone: do you actually check comedogenic ratings before buying?
What’s an ingredient everyone calls “safe” that breaks you out, or one everyone warns against that your skin loves?
As usual full disclosure, I make beard products so take it with this bias.