Spirulina is one of the ancient microorganisms, and its microfossils have existed for more than 3 billion years. Using a microscope, the appearance of Spirulina is unbranched filamentous, like a coiled spring, and it is blue-green. The Food and Agriculture Organization of the United Nations has identified spirulina as the "most ideal food in the 21st century". Spirulina has very strict requirements for growth conditions: the water temperature should not exceed 30-35℃; the perennial light should be strong and long; the water body needs to be strong alkaline; the water quality is clean and pollution-free.
The protein content in Spirulina is equivalent to 1.5 times that of soybeans, 10 times that of rice, 4 times that of pork, 3 times of beef, 3.7 times of chicken, 5 times of eggs, 3 times of fish, and 2.4 times of cheese. The content of β-carotene in spirulina is 15 times that of carrots, and the content of vitamin B12 in spirulina is 4 times that of pig liver.