What a —/5 rating means
Because no dependable rating exists, judge Chlorella by how your own skin responds rather than by a number. The absence of a score is not the same as a zero — it simply means the ingredient has not been reliably tested on the classic comedogenic scale.
About Chlorella
It is a marine or algae extract, marketed for minerals and antioxidants. A freshwater green microalga sold as a detoxifying and peptide-rich active. It sits alongside spirulina, which is rated 4 here, in the algae group that pore-clogging lists treat with caution. It is named on the AcneClinicNYC pore-clogging ingredient list, but that list does not publish a 0-5 comedogenic score for it and no Fulton-derived table we cite carries one. We therefore leave it unrated rather than invent a number — treat the listing itself as the signal.
On a label it can read as Chlorella, Chlorella Vulgaris Extract, Green Algae — worth knowing when you scan an ingredient deck.
Chlorella in makeup and skincare
It features in 'anti-ageing' serums, masks, and luxury complexion products.