Black fungus, also known as black cabbage, is a precious colloidal fungus used both as medicine and food in my country and is also a recognized health food in the world. According to modern scientific analysis, the content of protein, vitamins and iron in dried black fungus is very high. The protein contains a variety of amino acids, especially lysine and leucine. Black fungus is not only tender and delicious, but also rich in nutrients. It enjoys the reputation of "vegetarian meat" and "vegetarian king" and is a well-known tonic. Black fungus is a type of colloidal fungus that contains a large amount of colloid, which has a good lubrication effect on the human digestive system. It can eliminate residual food and indigestible fibrous substances in the intestines and stomach, and can effectively remove wood residues, sand dust, etc. that are inadvertently eaten. Foreign matter has a dissolving effect.