Is Chlorella Good for Weight Loss?

Written by: Pard Bharaj



Time to read 9 min

Image of Pard, the Author

Author: Pard Bharaj

I am a dedicated researcher with nearly a decade of experience in investigating health best practices. My journey in the health and wellness field has been driven by a passion for understanding and sharing the most effective ways to maintain and improve health. 

"Adding chlorella and chlorophyll to your smoothie gives you the benefits of leafy greens in their most raw form"

Hannah Bronfman


Chlorella, a green microalgae, has earned a reputation as one of the most nutritious plants in the world, thanks to its dense nutritional profile. It offers numerous scientifically proven health benefits, ranging from detoxification and improving skin and liver health to boosting energy levels. 

In this article, I will focus on whether Chlorella is effective for weight loss and examine relevant scientific studies to substantiate this claim.

Chlorella Interest Facts:

  • Discovery: Chlorella is a genus of single-celled green algae that was first discovered in 1890 by the Dutch microbiologist Martinus Willem Beijerinck.

  • Nutritional Value: Chlorella is renowned for its exceptional nutritional profile. It is a rich source of protein, containing all nine essential amino acids. It also provides various vitamins, minerals, and antioxidants, making it a popular dietary supplement.
  • Oxygen Production: Chlorella is one of the most efficient oxygen producers in the world, capable of producing oxygen at a rate much higher than most other plants. This attribute makes it valuable for oxygenating water in aquaculture systems and improving air quality.

  • Bioremediation : Chlorella has been investigated for its ability to remediate polluted environments. It can absorb various pollutants, including heavy metals, pesticides, and organic contaminants, from water and soil, offering a natural and sustainable solution for environmental cleanup.

Is Chlorella Good for Weight Loss?  

1.  Boosting Metabolism:

Chlorella's potential to enhance weight loss begins with its impact on metabolism. This algae is rich in essential nutrients that play important roles in metabolic health, including B vitamins, iron, zinc, and magnesium. 

These nutrients are vital for converting food into energy rather than storing it as fat. B vitamins, particularly B12 and B6, are directly involved in improving metabolic processes by helping the body produce energy more efficiently. Iron helps in the synthesis of haemoglobin, which is essential for transporting oxygen to muscles and tissues, thereby increasing metabolic rate and energy levels.

The presence of these nutrients in chlorella not only supports a healthy metabolism but can also contribute to increased fat burning, making it a beneficial addition to a weight loss diet.

Asian man in traditional attire inspecting asian ginseng (panax) roots on a wooden table in a classical Chinese setting.

2. Reducing Fat Absorption:

Chlorella has been suggested to play a role in reducing the absorption of fat in the digestive system, which can be a significant advantage for those looking to lose weight. This green algae contains high levels of dietary fibre, which binds to fats in the digestive tract, potentially reducing their absorption and subsequently lowering the amount of calories absorbed from the diet. Fibre-rich foods like chlorella increase the feeling of fullness and can extend digestion time, further helping to minimise overall calorie intake.

In addition, chlorella's lipid-lowering effects are supported by some studies that show its capability to decrease serum cholesterol levels. Impacting lipid metabolism, chlorella may reduce the amount of fat stored in the body, further promoting weight loss. This effect is particularly beneficial in maintaining long-term weight management and improving metabolic health.

Indian man grinding ginger in a mortar in a traditional Indian setting with architecture and sunlight.

3. Enhancing Glucose Metabolism:

Chlorella's influence on glucose metabolism is another means by which it may aid weight loss and improve metabolic health. Regular consumption of chlorella has been linked to improved blood sugar control and a reduction in insulin resistance, which are crucial factors in managing body weight and preventing obesity-related diseases such as type 2 diabetes.

The algae's rich content of antioxidants, including chlorophyll, can help protect cells from oxidative stress and improve insulin sensitivity. This means that the body can use insulin more effectively, helping to lower blood sugar levels after meals and prevent sudden spikes and crashes that can lead to increased hunger and overeating.

There is also some evidence to show that chlorella can enhance the expression of genes involved in glucose metabolism. This helps in optimising the use of glucose derived from food, ensuring that it is used for energy rather than being stored as fat. 

A stylized woman in Egyptian headdress holding a pomegranate with an ancient temple in the background.

4. Detoxification and Weight Loss 

Chlorella, known for its detoxification properties, is effective in binding and removing heavy metals and toxins from the body. This detoxification process is primarily attributed to its high chlorophyll content, which enhances liver function‚ÄĒthe body's main detox organ.

Detoxification through chlorella might indirectly support weight loss by improving metabolic efficiency and overall health. By removing toxins that can interfere with metabolic processes, chlorella potentially restores the body’s ability to burn calories more effectively. This improved metabolic function can play a role in reducing body weight, especially when combined with a healthy diet and regular exercise.

Man in ancient Greek attire grinding fenugreek in a courtyard.

5. Controls Appetitie:

Chlorella may contribute to weight loss by influencing appetite-regulating hormones, thereby helping to control hunger and increase feelings of fullness. This green algae is a rich source of protein (50 to 60% protein) and dietary fibre, both of which are known to prolong satiety. Protein stimulates the production of hormones that signal fullness to the brain, such as peptide YY and cholecystokinin, while reducing levels of ghrelin, the hormone responsible for hunger.

The dietary fibre in chlorella also plays a significant role in appetite control. Fibre expands in the stomach, increasing the volume of contents and triggering stretch receptors that tell the brain that the stomach is full. This physical process helps to extend the time between meals and decrease the overall caloric intake by making individuals feel fuller for longer periods.

However, even though it is high in protein and fibre I would recommend treating this superfood like medicine and taking it in small quantities. A little is enough to give you all of the benefits.

A stylized woman in Egyptian headdress holding a pomegranate with an ancient temple in the background.

Chlorella Nutritional Table:

Chlorella Nutritional Table

"The great thing about chlorella is that it's the highest concentration of chlorophyll in the world, chlorophyll has the same chemical composition as your hemoglobin so it's very powerful to build your blood, which builds your immune system, which builds your gut which builds everything"

Catharine Arnston

How to Incorporate Chlorella into Your Diet:

  • Chlorella Tablets or Powder:¬†¬†Integrate organic Chlorella supplements into your daily diet to aid with weight-loss. Start with a low dose and gradually increase as per the product's guidelines or a healthcare provider's advice.

  • Smoothies and Juices:¬†¬†Add Chlorella powder to your morning smoothie or juice for a nutrient-rich start to your day.

  • Dosage:¬†The recommended dosage of chlorella can vary based on the specific health goals and the individual's tolerance. Generally, the typical daily dosage ranges from 3 to 5 grams of chlorella powder or tablets. However, some studies and product recommendations suggest starting with a lower dose, such as 1 gram per day, and gradually increasing to avoid potential side effects like nausea or digestive discomfort.

Potential Side Effects and Considerations:

  • Contaminants: Ensure chlorella is sourced from reputable suppliers to avoid contamination with toxins like heavy metals or bacteria. Always go for an organic source.
  • Common Side Effects: Overconsumption may lead to digestive issues, nausea, and gas. Some people might notice a green discolouration of their stools.
  • Pregnant Women: Chlorella should be used cautiously during pregnancy due to potential contaminants. Always consult a healthcare professional before starting any new supplement.
  • Interactions with Medications: Chlorella can affect blood clotting and may interact with anticoagulant drugs. It could also influence the effectiveness of immunosuppressive medications due to its immune-boosting properties.
  • Autoimmune Diseases: Individuals with autoimmune conditions should approach chlorella cautiously as it may stimulate the immune system, potentially exacerbating symptoms. Consult with a healthcare provider before use.
  • Dosage Guidelines: Follow recommended dosages closely to minimise side effects. Adjust as necessary based on personal health needs and medical advice.¬†


In conclusion, Chlorella stands out as a powerful superfood supplement with promising potential in aiding weight loss. Studies indicate that chlorella can enhance detoxification processes, improve metabolic health, and help manage body weight, particularly when integrated into a balanced diet. 

However, despite its numerous health benefits, it is important to consume chlorella in moderation to avoid potential side effects. As with any supplement, consultation with a healthcare provider is recommended to tailor its use to individual health needs and conditions.

Frequently Asked Questions:

How quickly can I see weight loss results with Chlorella?

Results vary, but some people may notice changes within a few weeks when combined with a healthy diet and exercise.

Can Chlorella be used with other weight loss supplements?

Yes, but consult a healthcare provider to avoid any potential interactions or side effects.

How does Chlorella compare to other superfoods for weight loss?

Chlorella is particularly effective due to its high nutrient density, detoxifying properties, and ability to boost metabolism.

References and Further Reading:

1. The effect of Chlorella vulgaris on obesity related metabolic disorders 

The study indicates that Chlorella might be beneficial in managing obesity-related metabolic disorders, the existing studies do not provide enough statistical power to make a definitive conclusion.

2. Bioactivity of Macronutrients from Chlorella in Physical Exercise

This study discusses the bioactivity of macronutrients in Chlorella, particularly in the context of physical exercise. It highlights Chlorella's potential to improve both anaerobic and aerobic exercise performance, reduce fatigue, and contribute to better recovery. Chlorella is rich in proteins, fiber, and polyunsaturated fatty acids, which collectively enhance metabolic activities, increase satiety, and support muscle function during physical activities. The study also notes Chlorella's benefits for gut microbiota diversity, which is linked to better weight management and physical performance

3. Novel Chlorella pyrenoidosa peptides attenuate weight gain, insulin resistance, and lipid levels in mice fed a high-fat diet

The study explores the effects of a specific peptide from Chlorella pyrenoidosa on weight management and metabolic health in mice fed a high-fat diet. It highlights that this peptide can significantly reduce weight gain, improve insulin resistance, and modify lipid profiles by reducing LDL (bad cholesterol) and increasing HDL (good cholesterol). These effects are partially attributed to the peptide's ability to influence gut microbiota, suggesting its potential as a natural therapeutic agent for obesity and associated metabolic disorders

4. Potential of Chlorella as a Dietary Supplement to Promote Human Health

This study reviews various health benefits associated with Chlorella supplementation. It discusses Chlorella's role in improving cardiovascular health markers like cholesterol and blood pressure. It highlights Chlorella's potential in influencing metabolic health.

5. Chlorella Consumption Weight Gain Graph

The provided graph illustrates that over six months, mice on a Chlorella-supplemented diet (CSD Tg) showed more moderate body weight gain compared to the control group, despite similar food intake levels. This suggests Chlorella may help manage body weight by mechanisms other than reducing calorie intake, possibly including enhanced metabolic health or altered nutrient absorption.

6. Effect of Chlorella vulgaris on Liver Function Biomarkers:

Fat Metabolism:  Chlorella supplementation enhances liver function by improving enzyme profiles, increasing antioxidant levels to reduce oxidative stress, improving fat metabolism to mitigate fatty liver disease risk, supporting detoxification processes, reducing inflammation markers for healthier liver conditions, and regulating cholesterol and glucose levels for overall metabolic health. 

7. NAFLD and Liver Health Enhancement: 

Chlorella's impact on NAFLD includes managing symptoms and markers, reducing liver enzymes (ALT, AST) for improved liver health, enhancing lipid profiles by lowering triglycerides and cholesterol, improving glucose metabolism beneficial for insulin resistance, decreasing inflammatory markers to reduce liver inflammation, and boosting antioxidant capacity to combat oxidative stress in the liver. Exploring chlorella's potential to reduce liver damage in NAFLD patients

8. Comprehensive NAFLD Management with Chlorella vulgaris: 

Recognised as an effective supplement for NAFLD-related complications, Chlorella vulgaris significantly modulates dyslipidemia, improves insulin resistance (notably at a 10% dosage), down-regulates inflammatory genes within the p38 MAPK/TNF-őĪ/NF-őļB pathway to reduce inflammation, reverses the effects of a high-fat diet on biochemical serum parameters, and positively impacts gene and protein expression related to TNF-őĪ and NF-őļB, showcasing its therapeutic effect on liver health. This study investigates the effectiveness of Chlorella vulgaris in counteracting complications related to non-alcoholic fatty liver disease (NAFLD) through modulating dyslipidemia, insulin resistance, and inflammatory pathways.¬†

9. Chlorella Health Benefits Plus Nutrients: 

Exploring Chlorella's health benefits: nutrient-rich, supports cardiovascular health, and offers antioxidant properties. Authors: Tomohiro Bito et al. 

10. The Long-Term Algae Extract (Chlorella and Fucus sp) and Aminosulphurate Supplementation Modulate SOD-1 Activity and Decrease Heavy Metals

This study conducted over 90 consecutive days led to a decrease in the levels of certain heavy metals, specifically Mercury, Lead and Tin, when compared to baseline levels. Additionally, mercury levels at the 90-day mark were lower than those in the untreated control group.

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