Spirulina is the common name for human and animal food supplements produced primarily from two species of cyanobacteria : Arthrospira platensis, and Arthrospira maxima. These and other Arthrospira species were once classified trait within the genus Spirulina. Now it is established that they are distinct genera, and that the food species belong to Arthrospira; nevertheless, the term "Spirulina" remains the popular name. Spirulina a blue green alga, belongs to the Oscillatoriaceae family, is Cyanobacteria Characterized by Spiral shaped chains of cells enclosed in a thin sheath Spirulina has a very long history of being serving as a source of food for human being. Spirulina is being sold in the local market of Republic of Chad since several hundred years and is called as "Dihe" or "Die'' by local populations Today Spirulina is consumed by millions of people all over the world and they are discovering lots of health benefits apart from its nutritive value.