Spirulina Benefits: 14 Reasons to Use This Superfood

It’s blue-green, absurdly healthy but often overlooked or misunderstood. Spirulina may not be from Pandora, but it grows in our version of that magical moon, Hawaii, along with other exotic locations around the globe.

This blue-green algae is a freshwater plant that is now one of the most researched and, alongside its cousin chlorella, most talked about superfoods today. Grown around the world from Mexico to Africa to even Hawaii, spirulina is renowned for its intense flavor and even more powerful nutrition profile.

While you may have only seen it as an ingredient in your green superfood beverages, energy bars and natural supplements, the health benefits of spirulina are so profound that taken on a daily basis they could help restore and revitalize your health. To date, there are more than 3,700 peer-reviewed scientific articles evaluating its health benefits. Plus, thanks to its impressive nutrient profile, aid programs around the globe have even started popping up to set up spirulina production in areas struggling with malnutrition.

So what exactly is this exotic ingredient, and how can it impact your health? Let’s take a closer look at spirulina, plus why you may want to consider adding it to your routine.

What is spirulina?

Spirulina is a type of blue-green microalgae that is able to grow in both fresh- and saltwater and is consumed by humans and other animals. There are two species of the spirulina plant, including Arthrospira platensis and Arthrospira maxima. Arthrospira platensis and Arthrospira maxima are cultivated worldwide and used as dietary supplements (in tablet, flake and powder form) and whole food (and even for livestock and fish feed).

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What is spirulina good for? There are tons of spirulina reviews out there, claiming that this amazing algae can do everything from boost metabolism to stabilize blood sugar and prevent heart disease.

Research continues to uncover more and more potential benefits of spirulina, and studies have shown that adding it to your routine could help detox your body, boost energy levels and even enhance brain function.

This unique algae is believed to have been a staple for the Aztecs in Mexico. Referred to as “Tecuitlatl,” it was a primary source of protein for the Aztecs for several hundred years, and Lake Texcoco remains an abundant fountainhead of this superfood still today.

Here are a few of the most common types of seaweeds and algae that are used as foods and/or supplements:

• Hijiki
• Wakame
• Ogo
• Kelp
• Nori
• Kombu
• Arame
• Dulse
• Sea moss
• Blue spirulina
• Bladderwrack

Nutrition facts

Dietary spirulina is arguably the most nutrient-dense food on the planet. It’s why taking dietary spirulina supplements is essential to good health.

A one-tablespoon serving of dried spirulina (about seven grams) contains approximately:

• Calories: 20.3
• Total Carbohydrates: 1.7 g
• Fiber: 0.3 g
• Sugar: 0.2 g
• Total Fat: 0.5 g
• Saturated Fat: 0.2 g
• Polyunsaturated Fat: 0.1 g
• Monounsaturated Fat: 0.05 g
• Trans Fat: 0 g
• Protein: 4 g
• Sodium: 73.5 mg (3% DV*)
• Copper: 0.4 mg (44% DV)
• Riboflavin: 0.3 mg (23% DV)
• Thiamine: 0.2 mg (17% DV)
• Iron: 2 mg (11% DV)
• Niacin: 0.9 mg (6% DV)
• Manganese: 0.1 mg (4% DV)
• Magnesium: 13.6 mg (3% DV)

*Daily Value: Percentages are based on a diet of 2,000 calories a day.

It also contains some calcium, phosphorus, potassium, vitamin C, folate, vitamin A, vitamin B6, vitamin K, omega-3 fatty acids and omega-6 fatty acids.

What are the benefits of spirulina?

Not everyone can get their hands on the optimal Hawaiian variety, but fortunately, standard varieties provide very significant spirulina benefits for people who regularly consume it.

1. Helps detox heavy metals (especially arsenic)

Affecting people all over the globe, chronic arsenic toxicity is a problem. According to the World Health Organization, the U.S. is one of the countries affected by inorganic arsenic that is naturally present at high levels.

Arsenic toxicity is an even bigger problem in the Far East. In the words of Bangladeshi researchers, “Millions of people in Bangladesh, India, Taiwan and Chile are consuming a high concentration of arsenic through drinking water, and thousands of them have already developed chronic arsenic poisoning.”

In fact, up to 3 percent of the entire nation of Bangladesh showed clinical signs of arsenic poisoning alone. As Bangladeshi researchers pointed out, “there is no specific treatment” for arsenic poisoning, which is why they evaluated alternatives like blue-green algae.

After giving 24 patients affected by chronic arsenic poisoning spirulina extract (250 milligrams) plus zinc (two milligrams) twice daily, they compared the results with 17 patients who took a placebo and found that the spirulina-zinc combination worked. Ultimately, the participants experienced a 47 percent decrease of arsenic in their bodies.

Make this superfood part of your heavy metal detox or, in general, as a way to detox your body.

2. May help eliminate candida

Without a healthy microflora balance in our bodies, we are simply much more susceptible to sickness and disease, such as candida.

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In fact, leaky gut syndrome and improper digestion are directly connected to microfloral imbalance. Not only is invasive candidiasis the leading cause of mycosis-related death in the U.S., but candida overgrowth has become the hallmark sign for most autoimmune diseases today.

Because of our shift toward a diet rich in sugar and unnatural ingredients, antimicrobial resistance and ineffective antifungal drugs, we have seen a significant rise in yeast infections since the 1980s.

Thankfully, spirulina appears to be able to help. Several animal studies have shown that it’s an effective antimicrobial agent, particularly for candida.

Specifically, spirulina benefits have been shown to promote the growth of healthy bacterial flora in the intestines, which in turn inhibits candida from thriving. Additionally, the immune-strengthening properties of spirulina can help the body eliminate candida cells.

Another in vitro study found that a water extract of Spirulina platensis showed fungicidal activity against multiple candida species (including C. albicans) with measurable minimum inhibitory concentrations, suggesting potential antifungal properties worth further clinical investigation in humans.

3. Fights HIV/AIDS

Up until recently, epidemiologists have been puzzled trying to understand why people in Japan, Korea and Chad have relatively low HIV/AIDS rates. One possible explanation, revealed in a 2012 study published in the Journal of Applied Phycology, may be the amount of algae people in these areas regularly consume.

When researchers took 11 HIV patients who had never taken antiretrovirals, they split the participants into three groups: one who was assigned to eat five grams of brown seaweed every day, one who was to consume five grams of spirulina and one who ate a combination of both.

After the three-month trial period was complete, two key findings were discovered:

• Absolutely no adverse effects were experienced from both seaweed varieties and the combination.
• CD4 cells (T-helper white blood cells that fight infection and are used to stage HIV) and HIV-1 viral load (another HIV biomarker) remained stable.

The results were so promising that one participant volunteered to continue the study for an additional 10 months, and this participant actually benefited from “clinically significant improvement in CD4 and decreased HIV viral load.”

An additional study also demonstrated that spirulina deserves a place in natural HIV treatment.

4. Helps prevent cancer

More than 260 peer-reviewed articles have been published in the scientific literature evaluating spirulina’s ability to affect cancer cells.

Czech Republic scientists pointed out that, in addition to its ability to control blood cholesterol levels, “Spirulina is also rich in tetrapyrrolic compounds closely related to bilirubin molecule, a potent antioxidant and anti-proliferative agent.”

When tested on human pancreatic cells, these researchers discovered that, “Compared to untreated cells, experimental therapeutics significantly decreased proliferation of human pancreatic cancer cell lines in vitro in a dose-dependent manner.”

In addition, a 2019 study showed that spirulina reduces myelosuppression and improves immune function after chemotherapy in patients with malignant tumors. Another study the same year demonstrated how spirulina works against oral cancers.

5. Can help lower blood pressure

Phycocyanin is a pigment found in the spirulina that scientists experimenting on rats discovered possesses antihypertensive effects. Japanese researchers say that this is because consuming the blue-green algae reverses endothelial dysfunction in metabolic syndrome.

This could be extremely promising for Americans because metabolic syndrome has rapidly become one of the main causes of preventable disease today, as it raises one’s risk of developing heart disease, diabetes and stroke.

Furthermore, a randomized, controlled trial conducted on humans found that daily supplementation with Spirulina maxima (two grams per day) for three months in overweight adults with hypertension led to a significant reduction in systolic blood pressure compared with placebo. This suggests it can help lower blood pressure in people with high blood pressure.

In other words, it’s a food that lowers blood pressure.

6. May reduce cholesterol

Along those same lines, spirulina benefits have also been shown to prevent atherosclerosis and lower cholesterol levels.

One randomized, doubled-blinded, placebo-controlled trial published in BMC Complementary and Alternative Medicine found that obese adults who took Spirulina platensis (one gram per day for 12 weeks) experienced a significant reduction in serum total cholesterol compared with placebo, showing that spirulina supplementation can help improve cholesterol levels in humans.

These findings have been backed up in several meta-analyses.

7. Protects heart health

This algae has been shown in studies to improve cardiovascular risk factors that are major contributors to stroke risk and heart disease, like high blood pressure and dyslipidemia. For example, a 2025 systematic meta-analysis of randomized, controlled trials found that spirulina supplementation in adults significantly reduced systolic and diastolic blood pressure and improved glucose metabolism and lipid profiles, which are established stroke risk factors.

The findings suggest his blue-green superfood may indirectly lower overall stroke risk through these effects and help protect against heart disease.

8. Can boost exercise performance

A 2022 study published in Frontiers in Nutrition indicated that spirulina may benefit both muscle strength as well as endurance.

Meanwhile, a 2020 study showed that supplementing with spirulina could improve oxygen uptake during an arm cycling exercise. Researchers said that it could behave like an ergogenic aid to improve overall athletic performance.

9. May alleviate sinus issues

Studies have revealed that this algae may help treat allergic rhinitis, as spirulina benefits the body by reducing the inflammation that causes people to experience sinus problems. Compared to placebo trials, it is effective at reducing itching, nasal discharge, nasal congestion and sneezing.

A 2020 study demonstrated that it was more effective than an antihistamine called cetirizine to deal with allergies and allergic rhinitis, as well as decrease inflammation.

10. May offer protection for the brain

Research has revealed that spirulina supplementation may offer benefits for brain health in people with neurological disease. For instance, in a 12‑week randomized, double‑blind, placebo‑controlled study of adults with Alzheimer’s disease, those who took 500 milligrams of spirulina twice daily had a significant improvement in cognitive function (measured by the Mini‑Mental State Examination) compared with placebo, as well as reductions in inflammation (hs‑CRP) and improved metabolic markers linked to brain health.

While more research in healthy populations is needed, this study suggests it may help protect or support brain function by reducing inflammation and enhancing cognitive performance.

11. Could protect eye health

Animal research relays that this algae superfood helped suppress “light-induced photoreceptor death, retinal degeneration, and subsequent visual impairment.” It’s believed this is due to the beta-carotene in spirulina.

In addition, some research has found that “spirulina is an effective dietary source of zeaxanthin to humans,” a vital nutrient for eye health. Healthy volunteers who consumed it showed a significant increase in serum zeaxanthin concentration, indicating that it is an effective dietary source of this protective nutrient linked to better long‑term eye health.

It is important to note, however, that not all products analyzed by the U.S. Department of Agriculture appear to contain zeaxanthin.

12. Supports oral health

This green superfood benefits oral health in many ways. For instance, it’s been found to help treat and prevent gum disease (aka periodontitis) and leukoplakia in human studies.

13. Helps manage weight

A 2020 review discovered that adding spirulina to the diet can help people lose or manage weight. Consumption of this supplement was linked with lower body mass index, body fat, waist circumference, appetite and blood lipids.

This came on the heels of research published in 2019, which found that “spirulina supplementation significantly reduces body weight, especially in obese individuals.”

In fact, a 2022 study examined the effects of supplementing with this superfood on gradual weight loss in competitive wrestlers. The results relayed that supplementing with spirulina during a gradual weight loss program helped wrestlers reduce body fat percentage and fat mass, along with other markers for weight and muscle.

Combined with resistance training, supplementing with this algae also has been found to help obese men lose weight.

14. Helps keep blood sugar levels stable

There is plenty of evidence that supplementing with spirulina can help manage blood glucose levels. For example, research published in 2022 found that taking just eight grams of it in a drink helped with glycemic control and blood glucose markers.

Furthermore, a study from 2001 tested the effects of spirulina supplementation on patients with type 2 diabetes mellitus. Twenty-five subjects were randomly assigned to the supplement or control group.

After two months of supplementation, there was “an appreciable lowering of fasting blood glucose and postprandial blood glucose levels.”

Products and dosage recommendations

A common question when first trying out this incredible ingredient is: How much spirulina to take daily?

Although there’s no standard spirulina dosage, most studies have found a beneficial effect when consuming one to eight grams per day. For reference, one tablespoon of blue spirulina is about seven grams.

Can you overdose on spirulina? Taking even large amounts is unlikely to cause serious harm, but it may result in digestive issues like nausea, diarrhea, bloating and cramps.

Therefore, it’s best to start with a lower dosage and slowly work your way up to assess your tolerance.

When it comes to how to take spirulina, the options are endless. Spirulina capsules and spirulina tablets can be found at many health stores and pharmacies for a quick and convenient way to get in your daily dose.

Organic spirulina powder is also available and can be easily combined with other superfoods, such as in super green powders, to create nutritious green drinks (or detox drinks).

Should spirulina be taken on an empty stomach? There are lots of different recommendations out there for when and how you should take spirulina, but it’s likely to be equally beneficial however you decide to take it, whether that’s before, during or after your meals.

Risks and side effects

Many people wonder: Is spirulina safe for kidneys, or is spirulina bad for your liver?

If not, what are the side effects of spirulina?

Despite the multitude of spirulina benefits, there are potential spirulina side effects to consider as well.

In particular, there have been some published case reports of individuals who had autoimmune reactions after using spirulina. There is a theory that this may be caused by the activation of an inflammatory agent, TNF-alpha, which could be more significant in people predisposed to autoimmune disease.

However, other lab and research studies suggest that spirulina might suppress this inflammatory protein, so more research needs to be completed to evaluate the potential danger of spirulina for those with autoimmune disorders.

If you have an autoimmune condition, it’s a good idea to take this supplement under the supervision of your healthcare provider.

When considering where to buy spirulina, be sure to always purchase from a reputable retailer. It’s absolutely critical to make sure that the quality and purity of the spirulina that you consume is of the highest standards.

Particularly, like anything that comes from the sea, be certain to only purchase blue-green algae that is free from contamination.

Also, some sources suggest that pregnant women and children should not consume algae. Contact your healthcare provider to confirm whether or not you should use spirulina supplements.

Spirulina vs. chlorella

Because they are both similar microalgae species, it’s easy to understand how scientists confused chlorella and spirulina back in the 1940s.

In spite of their stark differences, people commonly mistake one for the other even today. Here are the four main differences that are important to understand:

1. Shape

First of all, spirulina is a spiral-shaped, multi-celled plant with no true nucleus. It’s blue-green in hue and can grow up to 100 times the size of chlorella.

Comparably, chlorella is a spherical-shaped single-celled microorganism with a nucleus and is solid green.

2. How it’s grown

Second, the growing conditions differ considerably. Spirulina grows best in low-alkaline conditions, particularly, freshwater lakes, ponds and rivers. It also requires an abundance of sunshine and moderate temperatures.

Chlorella, on the other hand, grows in freshwater typically occupied by other organisms, which makes it more challenging to harvest.

3. Preparation

Third, the ways in which both spirulina and chlorella can be eaten are also very different.

Because of its hard, indigestible cellulose wall, for instance, chlorella requires mechanical processing to make it worthwhile for human consumption. Otherwise, the body won’t be able to break down and metabolize its nutrients.

The process can be quite costly, which explains why chlorella is usually more expensive than spirulina. On the other hand, spirulina has a completely digestible cellulose wall and can be immediately consumed and digested with ease.

4. Nutrition

Finally, although both are considered superfoods, spirulina and chlorella differ in their nutritional content. Arguably the healthier of the two, spirulina contains more essential amino acids, iron, protein, B vitamins, and vitamins C, D and E.

With that said, chlorella still holds an abundance of health benefits.

Frequently asked questions

What is spirulina?

Spirulina is a blue-green algae (technically a cyanobacterium) that grows naturally in freshwater and saltwater environments. The two most commonly used species in supplements are Arthrospira platensis and Arthrospira maxima. It has been consumed for centuries and is now widely available in powder, tablet and capsule form.

Because it is naturally rich in plant-based protein, antioxidants, vitamins and minerals, it’s often classified as a nutrient-dense “superfood.” Many people take spirulina daily to support energy, detoxification, immune function and overall wellness.

What are the main spirulina benefits?

The most researched spirulina benefits include:

• Supporting healthy cholesterol levels already within the normal range
• Promoting balanced blood pressure
• Helping reduce oxidative stress
• Supporting immune system function
• Aiding detoxification of certain heavy metals
• Providing a concentrated source of plant-based protein
• Supporting endurance and exercise performance

Spirulina’s antioxidant compounds, including phycocyanin, help combat free radical damage and inflammation, which may explain many of its broad health-supporting effects.

Is spirulina a good source of protein?

Yes, spirulina is approximately 60 percent to 70 percent protein by dry weight, making it one of the most protein-dense plant foods in the world. It contains all nine essential amino acids, though some are present in lower amounts than in animal proteins. Because it is highly digestible, spirulina protein is often used in smoothies and functional foods to boost overall protein intake, especially for vegetarians and vegans.

Can spirulina help with detoxification?

One of the more well-known spirulina benefits is its potential ability to bind to certain heavy metals and support their removal from the body. Research suggests it may be particularly helpful in supporting detoxification from arsenic exposure when used as part of a comprehensive plan. Its chlorophyll content may also support the body’s natural detox pathways, including liver function and the elimination of environmental toxins.

Does spirulina help lower cholesterol?

Several studies suggest spirulina may help support healthy LDL cholesterol and triglyceride levels already within the normal range, while potentially increasing HDL (“good”) cholesterol. These spirulina benefits are thought to be related to its antioxidant and anti-inflammatory properties, along with its impact on lipid metabolism.

Can spirulina support blood sugar balance?

Emerging research indicates that spirulina may help support healthy blood sugar levels already within the normal range. It may improve insulin sensitivity and reduce markers of oxidative stress associated with metabolic dysfunction. However, individuals with diabetes or those taking blood sugar-lowering medications should consult a healthcare provider before adding spirulina to their routines.

Does spirulina boost the immune system?

Yes, immune support is one of the most widely discussed spirulina benefits. Compounds like phycocyanin and polysaccharides may help stimulate immune cell activity and enhance the body’s natural defense mechanisms. Spirulina may also help modulate inflammatory responses, supporting a balanced immune reaction rather than overstimulation.

How much spirulina should you take daily?

Typical spirulina dosages range from one to three grams per day, though some studies have used doses up to eight grams daily. The ideal amount depends on your health goals, body size and overall diet.

It’s best to start with a lower dose and gradually increase as tolerated. Always follow product label directions, or consult a qualified healthcare professional.

Are there any side effects of spirulina?

It is generally considered safe for most healthy individuals when sourced from a reputable manufacturer. However, possible side effects may include:

• Mild digestive discomfort
• Headaches
• Allergic reactions (rare)

People with autoimmune conditions, phenylketonuria (PKU), or those who are pregnant or breastfeeding should consult a healthcare provider before use. It’s also important to choose high-quality spirulina that has been tested for contaminants such as heavy metals and microcystins.

Is spirulina better in powder or tablet form?

Both forms provide similar spirulina benefits. Powdered spirulina is versatile and can be added to smoothies, juices or energy bites. Tablets and capsules are more convenient and may help mask the strong, earthy taste.

The best option depends on personal preference and lifestyle.

How long does it take to see spirulina benefits?

Some people report improved energy within a few days to a couple of weeks. Spirulina benefits related to cholesterol, blood sugar or immune markers may take several weeks of consistent use. For best results, it should be taken regularly as part of a balanced diet and healthy lifestyle.

Final thoughts

• Spirulina, a blue-green algae grown in some of the most beautiful places in the world, has been well-researched for its many potential benefits.
• Spirulina benefits include detoxing heavy metals, eliminating candida, fighting cancer and lowering blood pressure.
• Each serving contains a good amount of spirulina protein, plus important vitamins and minerals, like copper, iron, riboflavin and thiamine.
• Although there are several distinct differences between chlorella vs. spirulina, the two are often confused.
• Spirulina may cause autoimmune reactions in some who are susceptible to autoimmunity. It’s also not recommended for pregnant women or children. Be cautious where you purchase it, as it may be contaminated if not bought from a high-quality source, leading to additional spirulina side effects.