Various Blue/Green Algae Kosher Non-Irradiated Herbal Supplement Our spirulina is cultivated in man made ponds where it is constantly monitored to ensure it's purity and that it is free from heavy metal and chemical contamination. Spirulina is the common name for two species of cyanobacteria, or blue-green algae. A staple food of the Aztecs until the 16th-century, it is now cultivated throughout the world.