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Spirulina is a cyanobacterium (blue-green algae) that can be consumed by humans and other animals. There are two species, Arthrospira platensis and Arthrospira maxima.
Arthrospira is cultivated worldwide; used as a dietary supplement as well as a whole food; and is also available in tablet, flake and powder form. It is also used as a feed supplement in the aquaculture, aquarium and poultry industries.
Dried spirulina contains about 60% (51–71%) protein. It is a complete protein containing all essential amino acids, with slightly lower amounts of methionine, cysteine, and lysine compared to certain animal-derived products. From a nutritional point of view, spirulina is no better than other protein sources, but is more expensive gram-for-gram and may have adverse interactions when taken with prescribed drugs.