Spirulina, growth in alkali environment and known as a moss among the common people is a type of blue-green alg. Algs are organisms, which use sunlight most effectively and convert it into energy with its high chlorophyll amount. The amount of protein (%65) within spirulina, containing all essential amino acids, twice more than that of the soybean known as the best source of protein. it also includes vitamin B12 found only within animal products. Therefore, it can be used by vegetarians in order to eliminate B12 deficient.