Chlorella Pyrenoidosa

BotanicalAlgaeBest with a meal

What is it

Chlorella pyrenoidosa is a single-celled green freshwater microalga used as a whole-food supplement. It is rich in protein, B vitamins (including some B12 analogs), iron, and chlorophyll, with a thick cell wall that must be broken to improve digestibility.

Evidence for 2 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Plant nutrient density

Good Evidence

Provides protein, B vitamins, iron, and carotenoids; useful as a whole-food top-up, but supplemental B12 in chlorella is mostly analog form and unreliable for B12 status.

Lipid / blood pressure markers

Limited Evidence

Small RCTs show modest reductions in LDL-C and blood pressure; effect sizes are small and study quality is mixed.

How it works

Chlorella provides plant protein, minerals, carotenoids, and chlorophyll. Cracked-cell or broken-cell-wall chlorella allows the body to access intracellular nutrients more efficiently. Some studies suggest binding of heavy metals and dioxins to chlorella cell wall components, supporting interest in 'detox' applications. Clinical studies suggest small improvements in lipid markers, blood pressure, and immune markers in some populations, but study quality is variable.

Dosage

There is no RDA. Common doses are 3-6 g/day of broken-cell chlorella. DSLD does not provide a median dose for this entry.

When and how to take it

Take with meals to improve tolerability and nutrient absorption. Distribute doses if using larger amounts.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Broken-cell-wall Chlorella pyrenoidosa

Tablets, powders, and capsules; choose tested products.

Cell wall disruption is key to digestibility.

Safety

Generally well tolerated. Initial GI symptoms (gas, bloating, green stools) are common. Photosensitivity has been reported with very high doses. Quality control matters: some sources have been contaminated with heavy metals.

Who should be cautious

Coordinate with a clinician if on warfarin. Pregnancy/breastfeeding: food-doses appear safe. Caution in iodine sensitivity for marine algae; chlorella is freshwater but quality control varies.

Interactions

Vitamin K content can reduce warfarin effectiveness, requiring INR adjustments. May modestly affect iron and other mineral absorption when consumed in large amounts.

Food sources

Chlorella (algae)

Amount
3 g
%DV
—

Frequently asked questions

Is chlorella a reliable B12 source?⌄

Most chlorella products provide B12 analogs that are not reliably bioavailable. Vegans should use a verified B12 supplement.

Will chlorella detox heavy metals?⌄

Preclinical and small human studies suggest some binding of heavy metals, but evidence for clinically meaningful detoxification in healthy adults is limited.

References

Chlorella Pyrenoidosa on Wikidata — Wikidata link

Chlorella Pyrenoidosa on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Chlorella Pyrenoidosa (PubMed search) — PubMed link

Track Chlorella Pyrenoidosa with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store
Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.