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The term spirulina refers to a large number of cyanobacteria, or blue-green algae. Both Spirulina spp . and non- Spirulina spp. fall into the classification of cyanobacteria, and include: Aphanizomenon spp., Microcystis spp., Nostoc spp., and Spirulina spp. Most commercial products contain Aphanizomenon flos-aquae, Sprirulina maxima, and/or Spirulina platensis.
These algae are found in the warm, alkaline waters of the world, especially of Mexico and Central Africa. Spirulina spp. are most often grown under controlled conditions and are subject to less contamination than the non-spirulina species that are harvested naturally.