What is Spirulina?
Spirulina (INCI name: Spirulina Platensis Extract) is a marine or algae-derived extract. A blue-green algae named on pore-clogging lists in the high range; data is limited and formula-dependent.
You may see it on labels as Spirulina, Arthrospira Plantensis, Blue Green Algae, Blue Algae, so it can hide under more than one name in an ingredient list.
Where Spirulina shows up
You'll most often find Spirulina 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 Spirulina bad for acne-prone skin?
On acne-prone skin, Spirulina has a real chance of contributing to congestion. Check its position on the ingredient list before you worry — concentration changes everything.
Worth flagging: Spirulina'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 Spirulina, 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).