Normal elderly people are not recommended to take one tablet of vitamin B12 every day, and can supplement their daily requirement of vitamin B12 by consuming vitamin B12-rich foods such as animal offal and dairy products. Vitamin b12 tablets are clinically used mainly for the treatment of megaloblastic anemia, and its adverse effects include hypokalemia, hyperuricemia, etc. It is used with caution in patients with gout and patients with unspecified diagnosed neurological damage. Vitamin B12 intake mainly depends on the food in the daily diet, vitamin B12-rich foods include animal offal, dairy products, fish, eggs, etc. Therefore, normal elderly people do not need to supplement vitamin B12 tablets under a balanced diet structure. Whether the elderly need to take vitamin b12 tablets need to be clear whether there is a vitamin b12 deficiency related diseases, need to be under the guidance of the doctor to use the correct medication, do not do it on their own, in order to avoid the adverse effects.