Vitamin B12 test

Key facts Vitamin B12 (cobalamin) is a B vitamin. If you are vegetarian or vegan, you may be low in vitamin B12. Vitamin B12 and folate are necessary to make red blood cells and for tissue repair. Low levels of B12 could mean you have a type of anaemia. What is a vitamin B12 blood test? Vitamin B12 is one of the B group of vitamins. It is also known as cobalamin. It is vital for making red blood cells and for cell and tissue repair. Vitamin B12 also helps with nerve health. Vitamin B12 and folate work together to