Basic concept Spirulina is a lower plant, belonging to Cyanophyta and Trematodaceae. Like bacteria, they have no real nuclei in their cells, so they are also called cyanobacteria. Cyanobacteria, with primitive cell structure and very simple structure, is the earliest photosynthetic organism on earth, which has existed on this planet for 3.5 billion years. It grows in water, and it can be seen under the microscope that it is a spiral filament, hence its name. Spirulina is a specialty of Yunnan, and Chenghai Lake is the only place where spirulina can be cultivated in China, and the growth environment of spirulina is also very demanding. In China, basically all spirulina is cultivated artificially, and the quality of production is uneven. The broken spirulina sold by merchants is just a concept. Spirulina does not need to be broken, and its outer wall is not made of fibrous tissue, which is easy to be digested and absorbed by human body. It is impossible to remove the fishy smell simply by physical and mechanical means. Only when other fishy substances are added to spirulina, spirulina is not pure spirulina as mentioned by merchants. Nutrition Introduction Some tribes in Africa made spirulina into algae cakes hundreds of years ago. In recent decades, scientists have found that Spirulina is the best natural food source in protein discovered by human beings so far. Its content is as high as 60-70% in protein, 6 times that of wheat, 4 times that of pork, 3 times that of fish, 5 times that of eggs and 2.4 times that of cheese, and its digestibility is over 95%. Its unique phycocyanin can improve lymphocyte activity and enhance human immunity, so it has special significance for the rehabilitation of patients with gastrointestinal diseases and liver diseases. Among them, vitamins and minerals are extremely rich, including vitamin B 1, vitamin B2, vitamin B6, vitamin B 12, vitamin E, vitamin K and so on. It also contains trace elements such as zinc, iron, potassium, calcium, magnesium, phosphorus, selenium and iodine. The ratio of biological zinc to iron basically meets the physiological needs of human body, and it is easily absorbed by human body and can be absorbed quickly. Its carotenoid content is 1.5 times that of carrot, vitamin B 12 is 4 times that of pig liver and iron content is 23 times that of spinach. Therefore, Spirulina is of positive significance for the prevention and treatment of anemia. It contains a large amount of γ -linolenic acid, which is an essential unsaturated fatty acid for human body. It is an ideal substance for strengthening brain, improving intelligence, removing blood lipid, regulating blood pressure and lowering cholesterol. Spirulina polysaccharide in Spirulina can resist radiation damage and improve the side effects caused by radiotherapy and chemotherapy, which is a good diet for tumor patients. The chlorophyll content in spirulina is extremely rich, which is more than 10 times that of ordinary vegetables. It has a positive effect on promoting human digestion, neutralizing toxins in blood, improving allergic constitution and eliminating visceral inflammation. Spirulina contains only 5% fat and no cholesterol, which can prevent people from taking too many calories when supplementing essential protein. A large number of scientific research experiments at home and abroad have proved that spirulina plays an active role in lowering cholesterol and blood lipid, resisting cancer, losing weight, nourishing and protecting stomach, treating anemia and trace element deficiency, protecting liver, enhancing immunity and regulating metabolic function. It was recommended as "the most ideal food in 2 1 century" by FAO and World Food Association.