What is Carrageenan?
Chemically, Carrageenan is a texture-building thickener. A red-algae-derived gelling agent (Irish moss) rated 5/5 on the classic scale, though at the tiny use levels in most formulas its practical impact is debated.
You may see it on labels as Carrageenan, Carageenan Gum, Carrageenan Moss, Chondrus Crispus, so it can hide under more than one name in an ingredient list.
Where Carrageenan shows up
Carrageenan is commonly formulated into gels, serums, and lotions, where it controls consistency. Separately from clogging, its irritancy is rated 2/5 — low, so it's unlikely to sting or sensitise on its own.
Is Carrageenan bad for acne-prone skin?
If you are acne-prone, Carrageenan is one to watch — especially when it appears in the first few ingredients, which means it's present at higher concentration. Lower down a long ingredient list, its practical impact drops considerably.
Worth flagging: Carrageenan's rating is disputed. Credible sources land on different numbers, which is why we show a range rather than a single score — and why your own experience is the best tiebreaker.
Non-comedogenic alternatives
If you're avoiding Carrageenan, these lower-risk ingredients serve a similar role and are gentler on pore-prone skin:
- Squalane — rated 1/5 (Low risk).
- Niacinamide — rated 0/5 (Low risk).