It's considered a protein powerhouse, and considering its serving size, it looks to be a remarkable one.
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.
Dried spirulina contains about 60% (51–71%) protein.[2][3] 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.[4] 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.[5]


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