The Superfood You Need to Know About: Spirulina

Spirulina Powder

What is Spirulina?

Spirulina is a type of blue-green algae that has been used as a food source for centuries by various cultures around the world. It is rich in protein, vitamins, minerals, antioxidants, and other beneficial compounds that may support your health and wellness. In this blog post, we will explore some of the health benefits of spirulina, as well as some of the lesser-known facts and myths about this superfood.

Spirulina is a biomass of cyanobacteria (blue-green algae) that belongs to the genus Arthrospira. There are three main species: Arthrospira platensis, A. fusiformis, and A. maxima. It grows naturally in alkaline lakes and ponds, especially in tropical and subtropical regions. It can also be cultivated in artificial environments, such as tanks or ponds, under controlled conditions.

Spirulina has a spiral shape and a dark green color, due to the presence of a pigment called phycocyanin, which also gives it antioxidant and anti-inflammatory properties. It has a mild, nutty flavor and can be consumed as a powder, tablet, capsule, or liquid. It is often added to smoothies, juices, salads, soups, or baked goods.

What are the Health Benefits of Spirulina?

Spirulina is considered a superfood because it contains a high concentration of nutrients, such as protein, iron, calcium, magnesium, zinc, selenium, vitamin A, vitamin B12, vitamin E, and vitamin K. It also contains essential fatty acids, such as gamma-linolenic acid (GLA), which may help regulate inflammation, blood pressure, and cholesterol levels.

Some of the health benefits of spirulina that have been supported by scientific research include:

Blood sugar control

It may help lower blood sugar levels and improve insulin sensitivity in people with type 2 diabetes or prediabetes. A meta-analysis of 25 randomized controlled trials found that spirulina supplementation significantly reduced fasting blood glucose, postprandial blood glucose, and glycated hemoglobin (HbA1c) levels, compared to placebo or control groups.

Blood pressure reduction

It may help lower blood pressure and prevent hypertension, especially in people with metabolic syndrome or obesity. A systematic review and meta-analysis of 11 randomised controlled trials found that spirulina supplementation significantly reduced systolic and diastolic blood pressure, compared to placebo or control groups.

Cholesterol improvement

It may help improve blood lipid profile and reduce the risk of cardiovascular disease, by lowering total cholesterol, low-density lipoprotein (LDL) cholesterol, and triglycerides, and increasing high-density lipoprotein (HDL) cholesterol. A meta-analysis of 16 randomized controlled trials found that spirulina supplementation significantly improved all these lipid parameters, compared to placebo or control groups.

Liver health enhancement

It may help protect the liver from damage and improve its function, especially in people with chronic liver disease, such as hepatitis, cirrhosis, or fatty liver. A systematic review and meta-analysis of 13 randomized controlled trials found that spirulina supplementation significantly improved liver enzymes, such as alanine aminotransferase (ALT), aspartate aminotransferase (AST), and gamma-glutamyl transferase (GGT), as well as liver histology, compared to placebo or control groups.

Allergy relief

It may help alleviate the symptoms of allergic rhinitis, such as nasal congestion, sneezing, itching, and runny nose, by modulating the immune system and reducing inflammation. A meta-analysis of seven randomized controlled trials found that spirulina supplementation significantly reduced the severity and frequency of these symptoms, compared to placebo or control groups.

What are Some Lesser-Known Facts and Myths about Spirulina?

While spirulina is widely recognised as a nutritious and beneficial food, there are also some facts and myths about it that are not commonly known or discussed. Here are some of them:

Spirulina is not a complete protein source: While it has a high protein content (about 60% by dry weight), it is not a complete protein source, meaning that it does not contain all the essential amino acids that your body needs. It is particularly low in methionine and cysteine, which are important for the synthesis of glutathione, a powerful antioxidant. Therefore, it should be combined with other protein sources, such as legumes, grains, nuts, seeds, or animal products, to ensure adequate intake of all the amino acids.

Spirulina is not a reliable source of vitamin B12: While it contains a form of vitamin B12, it is not the same as the one that your body can absorb and use. Spirulina contains a type of vitamin B12 called pseudovitamin B12, which is inactive and ineffective in humans. In fact, consuming it may interfere with the absorption of the active form of vitamin B12, leading to deficiency and anemia. Therefore, it should not be relied upon as a source of vitamin B12, especially for vegans and vegetarians, who should supplement with the active form of vitamin B12 or consume fortified foods.

Spirulina may contain contaminants and toxins: It is susceptible to contamination and pollution from the environment where it grows, such as heavy metals, pesticides, microorganisms, and toxins. Some of these contaminants and toxins may pose health risks, such as liver damage, kidney damage, neurological damage, or allergic reactions. Therefore, it should be sourced from reputable and certified producers, who test their products for purity and safety. It is also advisable to consult with your healthcare provider before taking it, especially if you have any medical conditions or allergies.


Spirulina is a superfood that offers many health benefits, such as blood sugar control, blood pressure reduction, cholesterol improvement, liver health enhancement, and allergy relief. However, it is not a complete protein source, not a reliable source of vitamin B12, and may contain contaminants and toxins. Therefore, it should be consumed with caution and moderation, and in combination with other foods and supplements, to ensure optimal nutrition and wellness.

Spirulina FAQs

What is Spirulina and what makes it a popular dietary supplement?

Spirulina is a blue-green algae that grows in both fresh and saltwater environments. It has gained popularity as a dietary supplement due to its rich nutritional profile. Packed with essential nutrients such as protein, vitamins, and minerals, it is often considered a superfood. Its potential health benefits, including immune system support and antioxidant properties, contribute to its widespread use as a nutritional supplement.

How should I incorporate Spirulina into my daily diet?

Spirulina is available in various forms, including powder, capsules, and tablets. Many people prefer adding powder to smoothies, juices, or water for a convenient and quick intake. Capsules or tablets can be taken with water. It’s essential to start with small amounts and gradually increase the dosage to allow your body to adjust. Consulting with a healthcare professional or nutritionist for personalized advice on dosage is recommended.

Can Spirulina help with weight loss?

Spirulina is often promoted as a supplement that may aid in weight loss. While it’s true that it is low in calories and high in nutrients, it’s not a magic solution for shedding pounds. However, its nutritional content may support a healthy diet and lifestyle. Some studies suggest that it may help control appetite and reduce cravings, but individual responses can vary. It’s crucial to maintain a balanced diet and exercise routine for effective and sustainable weight management.

Are there any potential side effects or interactions with medications?

In general, Spirulina is considered safe for most people when taken in recommended doses. However, like any supplement, it may cause side effects in some individuals, such as digestive issues or allergic reactions. People with certain medical conditions or those taking medications should consult with their healthcare provider before adding it to their routine. Additionally, pregnant or breastfeeding women should seek professional advice before using it as a supplement.

Is Spirulina suitable for vegetarians and vegans?

Yes, Spirulina is suitable for both vegetarians and vegans. It provides all the essential amino acids, making it a complete protein. This makes it a valuable dietary supplement for individuals who follow a plant-based diet and may struggle to meet their protein needs through traditional sources.