Chlorella as a food ingredient: nutrition, benefits and hurdles
What it found
Chlorella is rich in protein, fats, carbohydrates, vitamins and minerals, and studies in people suggest it may support antioxidant levels, immune defence and removal of some contaminants.
The authors also flag high production costs, contamination risks and an unpleasant taste and smell.
What they found
Studies in people
Antioxidant effects in people
In a randomised, double-blind, placebo-controlled trial, 8 g of Chlorella a day for 2 months raised lutein levels in red blood cells by 4.6 times, while tocopherol levels stayed the same. In another trial, a dried Chlorella extract of 1.8 g a day for 6 weeks improved physical and cognitive symptoms in patients with major depressive disorder.
Immune support in people
A triple-blind randomised crossover trial found that 6 g of Chlorella a day for 4 weeks raised salivary SIgA levels compared with placebo. A separate double-blind trial in healthy adults found that 5 g a day for 8 weeks increased natural killer cell activity and levels of interferon-gamma and interleukin-1 beta.
Studies in people and animals
Detoxification
In rats given dioxin-contaminated rice oil, a diet containing 10% Chlorella increased fecal dioxin and cut gastrointestinal absorption of dioxins by 2% to 53%. In people, a randomised double-blind crossover trial found that 100 mg of Chlorella a day for 2 weeks reduced a carcinogenic heterocyclic amine metabolite in urine, and an open-label trial found that 9 g a day for 3 months lowered mercury in hair and blood.
Other findings
Nutrient content
Chlorella vulgaris contains 43% to 58% protein by dry weight, 5% to 58% lipids, and 12% to 55% carbohydrates depending on growing conditions. It also supplies vitamins A, B, C and E, plus calcium, potassium, magnesium and zinc.
Food product results
Adding Chlorella to croissants, pasta, cookies and muffins improved appearance, taste and texture in some studies, and boosted protein, ash and fat in cookies. In bread dough, up to 3.0 g per 100 g of flour improved dough properties, but higher amounts harmed texture and taste and sped up staling.
Production and safety issues
Chlorella can take up heavy metals such as mercury, lead and cadmium from its surroundings, so regular testing is needed. Its strong cell wall makes nutrients hard to digest, and its earthy taste and smell put some consumers off.
What the authors conclude
“Although C. vulgaris shows great potential as a nutritious food ingredient, overcoming existing challenges and optimizing production methods would be crucial for its successful adoption and widespread use.”
Also in their conclusions
- They say Chlorella vulgaris has great potential as a nutritious food ingredient and supplement.
- They advise improving production and processing methods, tackling contamination and sensory problems, and running solid clinical research to support its benefits.
- They state that with these measures, Chlorella could be seen as a viable and advantageous food supplement that meets consumer demand for healthy and environmentally friendly foods.
How it was done
The authors say demand is growing for sustainable, nutritious food sources as populations rise and conventional farming uses large amounts of land and water. They wanted to assess whether Chlorella vulgaris could work as a food substitute in the food industry.
They pulled together published research on Chlorella vulgaris: its nutrient content, how it is grown, its use in foods such as bread, cookies, pasta and yogurt, its health effects, and the barriers to selling it at scale. The health evidence they describe includes trials in people, studies in mice and rats, and lab tests on cells.
What it can’t tell you
- Many of the health findings come from animal or lab studies, which cannot show what happens in people.
- Some of the human trials were small or short, so they cannot show long-term effects.
- This is a review of existing research, so it cannot prove that Chlorella causes any of the health effects described.
Who paid
- Conflicts
- The authors declare no conflicts of interest
- Authors work at
- University of Birmingham, UK
The paper
- Title
- Chlorella vulgaris as a food substitute: Applications and benefits in the food industry
- Type
- ReviewThe authors read earlier studies and describe what they found. It isn’t a new study.
- Evidence
- Studies in people · animals · lab
- Summarised from
- Full text
- Licence
- CC BY. Words in quotation marks are the authors’; the rest is our summary.
- Cite
- Wang CA, Onyeaka H, Miri T, Soltani F (2024). Chlorella vulgaris as a food substitute: Applications and benefits in the food industry. Journal of food science. doi:10.1111/1750-3841.17529Free full textPubMed 39556490DOI
Summary written 29 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error