Auricularia auricula is extremely rich in nutrition. According to historical records, it is an exclusive product of emperors in ancient times. It contains a lot of nutrients such as carbohydrates, protein, iron, calcium, phosphorus, carotene and vitamins, and contains 375 mg of calcium per100g, which is equivalent to 7 times that of crucian carp. It contains auricularia auricula, which grows on rotten wood and looks like a human ear. It is black or brown-black, so it is named auricularia auricula, also known as wood fungus and tree chicken. Auricularia auricula is extremely rich in nutrition. According to historical records, it is an exclusive product of emperors in ancient times. It contains a lot of nutrients such as carbohydrates, protein, iron, calcium, phosphorus, carotene and vitamins, and contains 375 mg of calcium per100g, which is equivalent to 7 times that of crucian carp. It contains iron185mg, which is 70 times that of crucian carp.