Chlorella
A green algae marketed for detox and nutrition, with limited evidence.
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What it is
Chlorella is a single-celled green algae high in chlorophyll, protein, and vitamins. It's often marketed for 'detox' and general wellness.
How it works
Chlorella is a green algae high in chlorophyll, protein, and vitamins, often marketed for 'detox' on the idea that it binds certain compounds in the gut. Human evidence for the detox claims is limited; it's best seen as a nutrient-dense food supplement.
What it's been studied for
Taken as a nutrient-dense supplement and, in marketing, for detoxification.
What the evidence shows
Evidence is limited. A few small studies suggest minor effects on cholesterol or immune markers, but detox claims are not well supported. Best viewed as a nutrient-dense food supplement.
Who should consider it
It's used as a general nutrient supplement and, in marketing, for detoxification. The detox rationale isn't well supported, so keep expectations modest. Source quality matters.
Amounts commonly studied
Studies use a wide range, commonly a few grams per day.
How to take it
Studies use a few grams per day. 'Cracked cell wall' chlorella is marketed for better digestibility. Introduce it gradually to limit digestive upset.
Forms & absorption
'Cracked cell wall' chlorella is marketed for better digestibility; tablets and powder are common. Source and testing matter.
Food sources
Chlorella is itself an algae food, sold as tablets or powder; it isn't otherwise in a typical diet.
Safety & interactions
Generally well tolerated; can cause digestive upset initially and, rarely, photosensitivity. Choose tested products, since algae can concentrate contaminants.
Myths & what it won't do
Myth: chlorella detoxes heavy metals from your body. Reality: human evidence is limited and the detox claims are largely unsupported. Myth: more is better. Reality: it can cause digestive upset, and quality varies — choose tested products.
Common questions
- Does chlorella detox the body?
- Human evidence for detox claims is limited and largely unsupported — it's better viewed as a nutrient-dense supplement.
- Cracked cell wall — does it matter?
- Chlorella's cell wall is tough, so 'cracked cell wall' products are marketed for better digestibility.
- Any side effects?
- Digestive upset early on and, rarely, photosensitivity; choose tested products given algae can concentrate contaminants.
The amounts listed here are what published research has used — not a prescription or a recommended dose for you. Confirm anything you plan to take with your own healthcare provider, especially if you take medications, are pregnant or nursing, or have a health condition.
Related goals
Research on Chlorella
Recommendations on this page are informed by published research. This is educational information, not medical advice.
- Fallah AA, Sarmast E, Habibian Dehkordi S, et al. Effect of Chlorella supplementation on cardiovascular risk factors: A meta-analysis of randomized controlled trials. Clin Nutr. 2018;37(6 Pt A):1892-1901. View study →Note: Found chlorella modestly lowered cholesterol, blood pressure, and fasting glucose; it did not assess detox claims.