Vitamin B 12 is a vitamin.
It can be found in foods such as meat, fish, and dairy products. It can also be made in a laboratory.
Vitamin B12 is used for treating and preventing vitamin B12 deficiency, a condition in which vitamin B12 levels in the blood are too low. It is also used to treat perniciousanemia, a serious type of anemia that is due to vitamin B12 deficiency and is found mostly in older people. For this purpose, people use either a supplement that is taken by mouth or a gel that is applied inside the nose.
