Spirulina is the oldest plant(algae) which appeared on the earth more than 3.5billion years ago. For a long time, spirulina has grown in a salt lake of the tropics like Africa and Latin America. People in these area used spirulina as food. Although they didn’t have the knowledge of modern nutrition, they would know spirulina is an excellent nutrition food by their sense based on their experience. It is 1945 when spirulina started to be known in modern society. (Although spirulina was known by only native people who lived around growth area, spirulina became foods which get attention in the world because Dr.Clement from institut français du pétrolent, introduced spirulina at Microbial conference. It is acknowledged that spirulina is much superior to chlorella, which is known as microalgae same as spirulina, in terms of cultivation, nutritional balance and digestibility. Now it is recognized worldwide that spirulina is safe healthy food and spirulina is a popular nutritional supplement taken by Hollywood superstar and celebrity.