Your body can't produce vitamin B12 on its own, so getting it from your diet is important. If you're just starting to study it, we'll help you understand it further.

Medically reviewed by Amelia MacIntyre, DO Vitamin B12 helps your body make red blood cells, maintain nerve health, may boost energy levels, and support a good metabolism (turning food into energy).

If you often feel fatigued or exhausted, a dietary adjustment or supplementation may help. But is it possible to take too ...

Dear T.H.: Many people have strong feelings that vitamin B12 can dramatically improve their health, but it only helps to take vitamin B12 if you are deficient. Vitamin B12 deficiency isn't too common.

Vitamin B12 deficiency can manifest as tingling or numbness, particularly in the extremities, due to damage to the myelin ...