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Spirulina is a microalgae that has been consumed for centuries due to its high nutritional value and supposed health benefits. It is a secret, potent "superfood," and a "miracle from the sea." It is thought to have been a food source for the Aztecs in 16th century Mexico. Spirulina is a biomass of cyanobacteria that can be consumed by humans and animals. The two species are Arthrospira platensis and A. maxima. Spirulina is a type of blue-green algae that people can take as a dietary supplement. It contains significant amounts of calcium, niacin, potassium, magnesium, B vitamins and iron, essential amino acids (compounds that are the building blocks of proteins). In fact, protein makes up about 60 to 70 percent of Spirulina's dry weight.