Chlorella is spirulina's quieter sibling: a single-cell freshwater algae with one of the highest chlorophyll contents of any food, and one crucial buying rule that most labels hope you do not know. It is all about the cell wall.
Key takeaways
- Cracked cell wall or broken cell wall is essential. Intact chlorella passes through you largely undigested.
- Chlorella is chlorophyll-dense, which is what gives greens blends their deep colour.
- It naturally contains vitamin B12, unusual for a plant source, though it should be a bonus rather than your sole source.
- Sourcing and testing matter for the same reasons as spirulina.
Why chlorella took off
Chlorella has been cultivated at scale in East Asia for decades, where it is an everyday tablet in millions of households. Its density is the appeal: chlorophyll, protein, iron and carotenoids in a single-cell package. As UK greens formulas matured beyond one-algae recipes, chlorella became the standard partner to spirulina, and the two now anchor most serious blends together.
What to look for on the label
1. "Cracked" or "broken" cell wall
Chlorella's cellulose wall is tough enough that unprocessed powder is poorly absorbed. Reputable producers mill or crack it. If the label does not say so, assume it has not been done.
2. Species and dose
Chlorella vulgaris and Chlorella pyrenoidosa are the cultivated species. As ever, a milligram figure beside the name separates an ingredient from a garnish.
3. Clean cultivation
Controlled tanks or ponds with independent contaminant testing. Certificate of analysis on request is the phrase to look for.
What to avoid
Unspecified cell-wall status
The single most common corner cut in the category, because whole-cell powder is cheaper.
Heavy-metal silence
Algae concentrate what is in their water. No testing statement means no thanks.
Detox promises
Chlorella marketing attracts this word constantly. It has no place on a food supplement label.
How Healthier Options fits in
Chlorella is one of the fifteen greens and superfoods in our Super Greens Gummies, alongside spirulina, moringa, wheatgrass, kale and friends, with vitamins C, D3 and B12 carrying the approved claims: immune support from C and D3, and B12 contributing to the reduction of tiredness and fatigue.
- Chlorella named in the blend, in a formula that lists every green on the label.
- An easy daily greens habit, apple flavour, no shaker, no algae taste.
- Vegan, pectin-based, no added sugar, UK lab tested.
Who should consider chlorella?
- People building a broad greens habit rather than betting on one ingredient
- Vegans interested in plant-side B12 alongside a proper B12 supplement
- Anyone whose diet is short on leafy greens most weeks
Who should check first
- People on blood-thinning medication, since chlorella is naturally rich in vitamin K
- Anyone with an autoimmune condition, who should ask their GP first
How long until you notice anything?
Like all greens, chlorella is a background player. Judge it over months of daily use, not days.
Common questions
Chlorella or spirulina?
Both, ideally. They overlap but lead in different places, chlorophyll for chlorella, protein and phycocyanin for spirulina. Our Super Greens simply include the pair.
Is the B12 in chlorella enough for vegans?
Treat it as a welcome extra, not a plan. Our formula adds proper vitamin B12 on top for exactly that reason.
Why is my greens gummy so dark?
That is the chlorophyll, and largely the chlorella. It is the colour of the ingredient actually being present.
Read next
Last reviewed and updated August 2026. We refresh our articles every 90 days with the latest UK supplement-safety guidance, new internal links to related research, and any updates to dosing or ingredient evidence. This article is general information, not medical advice. Speak to your GP or pharmacist if you take regular medication.
