Vitamin B12, also known as cobalamin, is a trace element produced by the combined action of intestinal bacteria, gastric acid and pepsin to absorb nutritional breakdown compounds, and is an important component in promoting the reproductive development of red blood cells and constituting the nervous system. Therefore, once vitamin B12 is deficient, anemia, neurological headaches, memory loss, easy fatigue and sleepiness, and other neurological and hematological disorders can occur. Vitamin B12 helps to improve the absorption of folic acid and can also be used to protect nerves and tendon sheaths, which can lead to peripheral neurological inflammation if deficient in vitamin B12. In children, vitamin B12 deficiency may cause emotional instability, depression, delayed reaction and memory loss in the early stage of the disease, nausea, loss of appetite and weight loss in the middle stage of the disease; for women of childbearing age, they may suffer from irregular menstruation and physiological anemia, and may cause inflammation and lesions in the mouth, The disease may aggravate the prevalence of heart disease, severe weight loss, memory loss, fatigue, sleepiness, and serious damage to the spinal cord and nervous system. Vitamin B12 deficiency can affect the normal functioning of the circulatory and digestive systems and the immune system. You can take B vitamins directly to regulate your daily life, or you can take dietary therapy to improve your condition.