Comparison
Chlorella vs Spirulina
Both are freshwater microalgae widely used as superfoods, but they are different organisms: Chlorella is a eukaryotic green alga with a cell wall and very rich in chlorophyll, while Spirulina is a cyanobacterium without a rigid wall, with higher protein content and its signature blue phycocyanin.
| Criterion | Chlorella | Spirulina |
|---|---|---|
| Group | Eukaryotic green alga | Cyanobacterium (prokaryote) |
| Protein (dry weight) | ≈ 45–60% | ≈ 60–70% (FAO) |
| Signature pigment | Chlorophyll (green) | Phycocyanin (blue) + chlorophyll |
| Cell wall | Yes (broken to improve digestibility) | No rigid wall (highly digestible) |
| Habitat | Freshwater | Alkaline freshwater |
| Associated with | Chlorophyll, fibre, nucleic acids | Protein, phycocyanin, iron |
Which to choose?
If you want the highest protein content and blue phycocyanin with high digestibility, Spirulina stands out; if you are interested in chlorophyll and a fibre-rich cell wall, Chlorella is the reference. In practice they are often used complementarily.
Frequently asked questions
Spirulina, with ≈60–70% protein on dry weight per FAO, versus ≈45–60% for Chlorella.
Spirulina, because it has no rigid cell wall; Chlorella requires wall disruption to improve digestibility.
No: Chlorella is a eukaryotic green alga and Spirulina is a cyanobacterium (prokaryote); both are grouped with microalgae for their cultivation and uses.
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