Research review
Does chlorella powder have caffeine?
Chlorella is naturally caffeine-free — no composition study has ever listed caffeine among its nutrients, because green algae don't make it — and no trial has tested combining chlorella with caffeine for any effect.
The evidence doesn't support chlorella as a source of caffeine, or combining it with caffeine for any measured effect — no composition study of chlorella has ever listed caffeine among its nutrients, and no trial has tested pairing the two. Chlorella is a single-celled green alga; caffeine is a compound made by a specific set of unrelated plants, and there's no biological pathway for chlorella to produce it.
What the evidence doesn't support
It doesn't support the idea that chlorella itself contains, or contributes, any caffeine. It doesn't support combining chlorella with caffeine — in coffee, tea, or a caffeine supplement — for a boost in energy, focus or fat metabolism beyond whatever the caffeine does on its own; no trial has tested that combination. And it doesn't tell you the caffeine content of a specific "chlorella energy" or "green detox" drink with an added caffeine source, because that number comes from the drink's full recipe, set by whoever makes it, not from the chlorella.
What the research found
Composition research on chlorella — including lab characterizations of the whole-food supplement and nutrient surveys of commercial chlorella powders — consistently describes it as containing protein, lipid, minerals, vitamins, chlorophyll and carotenoid pigments. None of that research lists caffeine, because chlorella doesn't make it: caffeine is a purine alkaloid produced through a specific enzymatic pathway found in a handful of unrelated seed plants (coffee, tea, cacao, guarana, yerba mate) — not in green algae. That's basic biochemistry rather than a research gap, and it's why no study has bothered to measure caffeine in chlorella specifically.
No published research has tested drinking or taking chlorella alongside caffeine, in any form, for any outcome in people.
Questions people ask
Does chlorella powder have caffeine?
No. Chlorella is naturally caffeine-free; it isn't the kind of organism that produces caffeine at all.
Does taking chlorella with coffee or a caffeine supplement do anything?
No trial has tested it, so there's nothing specific to report. Any effect from combining the two would come from the caffeine dose itself, the same as caffeine on its own — not from an interaction with chlorella. See chlorella and coffee: how they pair for the practical side of combining them.
Can chlorella give you energy like caffeine does?
Not through the same mechanism. Some small exercise-performance trials have measured chlorella's effect on lactate and cardiac efficiency during exercise, covered in chlorella benefits: what's established and what isn't — but that's a different research question from caffeine's stimulant effect, and the two shouldn't be conflated.
When to talk to a doctor
Chlorella is not a source of, or a substitute for, caffeine, and nothing here recommends combining the two. If you're managing caffeine intake for a medical reason, or take a medication that interacts with caffeine, talk to a doctor about your actual caffeine sources by reading nutrition labels on specific products — not assumptions about chlorella.
Sources
- Effect of microfluidization on in vitro micellization and intestinal cell uptake of lutein from Chlorella vulgaris A lab digestion model found most of chlorella's lutein was not absorbed unless the cell wall was mechanically broken first, which made the lutein up to three times more available to intestinal cells in the model.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.