Vitamin B6 is also called "anti dermatitis vitamin". One of the B vitamins. It belongs to derivatives, including pyridoxine, pyridoxal and pyridoxamine, which exist in food in the form of mutual transformation. However, most of vitamin B6 in plants is pyridoxine, while most of human and animal bodies are pyridoxal and pyridoxamine. Human intestinal bacteria can also synthesize pyridoxine. In human body, pyridoxine can be transformed into pyridoxal and pyridoxamine, which cannot be transformed into pyridoxine. The three have the same physiological activity. Vitamin B6 is rapidly transformed into pyridoxal phosphate in human body. This compound plays an important role in amino acid metabolism. It is the coenzyme of decarboxylase, transaminase, canine uricase, deaminase and desulfurization hydratase. It is also a coenzyme necessary for carbohydrate and fat metabolism, central nervous system activities and blood red egg production. Vitamin B6 widely exists in nature. Egg yolk, fish, meat, seeds and cereals (Germ) contain more. Generally, the diet will not lack this vitamin. Lack of vitamin B6 can cause dermatitis, spasm, anemia and other symptoms.