What a 4/5 rating means
On the comedogenic scale, a 4 is in the high-risk band, with a real likelihood of clogging pores on acne-prone skin. That means Chondrus Crispus (Irish Moss) deserves attention if you break out easily, especially when it appears high on an ingredient list.
This rating is disputed. Credible sources land on different numbers for Chondrus Crispus (Irish Moss), so we publish the range (4) rather than a false single figure. When sources disagree this openly, your own experience carries real weight.
One thing the number cannot tell you is concentration. Ingredients are listed in descending order, so Chondrus Crispus (Irish Moss) near the end of a label is present in tiny amounts and matters far less than the same ingredient near the top.
About Chondrus Crispus (Irish Moss)
It is a marine or algae extract, marketed for minerals and antioxidants. The red seaweed behind carrageenan, named on pore-clogging lists in the high range.
On a label it can read as Chondrus Crispus, Chondrus Crispus Extract, Chondrus Crispus Powder — worth knowing when you scan an ingredient deck.
Chondrus Crispus (Irish Moss) in makeup and skincare
It features in 'anti-ageing' serums, masks, and luxury complexion products. Its irritancy is rated separately at 2/5, which is low.
Lower-rated alternatives to Chondrus Crispus (Irish Moss)
If you want a similar role with a friendlier comedogenic score, consider:
- Hyaluronic Acid — comedogenic rating 0/5 (Low risk).
- Niacinamide — comedogenic rating 0/5 (Low risk).
Chondrus Crispus (Irish Moss) comedogenic FAQ
Is Chondrus Crispus (Irish Moss) comedogenic?
It can be. Chondrus Crispus (Irish Moss) is rated 4/5 (high risk) on the 0–5 comedogenic scale, so it has a real chance of clogging pores on acne-prone skin, especially high on an ingredient list. Sources disagree on Chondrus Crispus (Irish Moss), so the rating is less settled than most.
What is the comedogenic rating of Chondrus Crispus (Irish Moss)?
Chondrus Crispus (Irish Moss) has a comedogenic rating of 4/5 (high risk). Of the 190 ingredients in our dataset with a published rating, 13 rate higher than Chondrus Crispus (Irish Moss), 151 rate lower, and 25 others share its 4/5. Among the 7 rated marine and algae extracts, 2 rate higher and none lower. The figure is drawn from 1 cited source, listed on this page.
Is Chondrus Crispus (Irish Moss) pore-clogging?
It is one of the more likely ones. At 4/5, Chondrus Crispus (Irish Moss) is in the high-risk band. It matters most when it appears near the top of an ingredient list, where it makes up a larger share of the product. Comedogenic ratings come mostly from rabbit-ear assays and small human patch tests of the pure ingredient at high concentration, so they are a screening guide, not a prediction for your skin or a medical claim.