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Blue-green algae, of which spirulina is a well-known example, is a group of 1,500 species of microscopic aquatic plants. The two most common species used for human consumption are Spirulina maxima and Spirulina platensis. Spirulina is particularly rich in protein and also contains carotenoids, vitamins, minerals, and essential fatty acids.1
Where is it found?
Blue-green algae grow in some lakes, particularly those rich in salts, in Central and South America, and Africa. They are also grown in outdoor tanks specifically to be harvested for nutritional supplements.
Blue-green algae have been used in connection with the following conditions (refer to the individual health concern for complete information):
| Science Ratings | Health Concerns |
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 Reliable
and relatively consistent scientific data showing a substantial health benefit. Contradictory, insufficient, or preliminary studies
suggesting a health benefit or minimal health benefit. For a herb, supported by traditional use but minimal
or no scientific evidence. For a supplement, little scientific support and/or minimal health
benefit. |
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Who is likely to be deficient?
As it is not an essential nutrient, blue-green algae is not associated with a deficiency state. However, people who do not consume a few servings of vegetables per day could benefit from the carotenoids and other nutrients in blue-green algae. Since it is a complete protein, it can be used in place of some of the protein in a healthy diet. However, very large amounts are required to provide significant quantities of these nutrients from blue-green algae.
How much is usually taken?
Blue-green algae can be taken as a powder or as flakes, capsules, or tablets. The typical manufacturer’s recommended intake is 2,000–3,000 mg per day divided throughout the day. However, typical amounts shown to have helpful properties in animal studies would be equivalent to 34 grams per day or more, for a 150-pound human.
Are there any side effects or interactions?
Few side effects have been reported from the ingestion of blue-green algae. However, as blue-green algae can accumulate heavy metals from contaminated water, consuming blue-green algae could increase the body’s load of lead, mercury, and cadmium,2 though noncontaminated blue-green algae have been identified.3 Another popular species of blue-green algae, Aphanizomenon flos-aquae, has been found to produce toxins.4 A few reports also describe allergic reactions to blue-green algae. Animal studies have found spirulina to be safe during pregnancy.5 6 7
There is one case report of a man who developed liver damage while taking spirulina.8 As he was also talking three prescription medications, it is not clear whether the spirulina caused or contributed to the liver injury.
At the time of writing, there were no well-known drug interactions with blue-green algae.
References
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The information presented in Aisle7 is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or chemist for any health problem and before using any supplements or before making any changes in prescribed medications.