Symptoms and dangers of copper deficiency are as follows: the first point, blood symptoms. It is manifested as anemia, reduction of neutrophils and white blood cells, as well as pallor, weakness, emaciation and fear of cold. The second point, vision, mainly manifested as color blindness, vision loss, and even severe copper deficiency patients may be blind. The third point, hair. Copper-deficient patients’ hair is curved and not straight, dry and brittle in texture, easy to break, and there are also related manifestations of seborrheic dermatitis, enlarged liver and spleen, unwillingness to eat, and diarrhea. The fourth point, there are changes in the central nervous system, mainly manifested as epilepsy and intellectual decline. The fifth point, other aspects, the child lack of copper will appear growth and development stagnation, women lack of copper will appear infertility, the lack of copper in the elderly will be prone to spontaneous fracture and so on.