Spirulina is the richest beta carotene food. Spirulina is the common name for human and animal food supplements similar to Chlorella and Aphanizomenon flos-aquae (Blue Green Algae.) Spirulina comes from two different species of cyanobacteria: Arthrospira platensis, and Arthrospira maxima. These and other Arthrospira species were once classified in the genus Spirulina. There is now agreement that they are a distinct genus, and that the food species belong to Arthrospira; nonetheless, the older term Spirulina remains the popular name. Spirulina is cultivated around the world, and is used as a human dietary supplement as well as a whole food and is available in tablet, flake, and powder form. It is also used as a feed supplement in the aquaculture, aquarium, and poultry industries. Spirulina contains an unusually high amount of protein (between 55 to 77%). It is a complete protein, which means it contains all essential amino acids. Spiriulina is also rich in fatty acids and contains vitamin B1 (thiamine), B2 (riboflavin), B3 (nicotinamide), B6 (pyridoxine), B9 (folic acid), vitamin C, vitamin D, and vitamin E. Also a rich source of potassium and other minerals.