What is Red Algae?
Red Algae (INCI name: Rhodophyceae Extract) is a marine or algae-derived extract. A red seaweed extract rated 5/5 for comedogenicity in classic lists.
You may see it on labels as Red Algae, Rhodophyceae Extract, Rhodophyta, so it can hide under more than one name in an ingredient list.
Where Red Algae shows up
You'll most often find Red Algae in anti-ageing serums, masks, and 'marine' or 'seaweed' branded skincare. Separately from clogging, its irritancy is rated 2/5 — low, so it's unlikely to sting or sensitise on its own.
Is Red Algae bad for acne-prone skin?
On acne-prone skin, Red Algae has a real chance of contributing to congestion. Check its position on the ingredient list before you worry — concentration changes everything.
Non-comedogenic alternatives
If you're avoiding Red Algae, these lower-risk ingredients serve a similar role and are gentler on pore-prone skin:
- Hyaluronic Acid — rated 0/5 (Low risk).
- Niacinamide — rated 0/5 (Low risk).