Medically reviewed by Jonathan Purtell, RDN Key Takeaways Vitamin B12 supports energy, red blood cell formation, nerve function, and DNA production.A deficiency can cause fatigue, weakness, headaches, ...

Vitamin B12 is an essential nutrient that we need to maintain nervous system function and overall health. It's also a very popular dietary supplement, even though most people can get enough of it from ...

The doctor explains B12 sources from a vegetarian diet, who needs them most, and how to incorporate them into a daily diet ...

Medically reviewed by Patricia Mikula, PharmD Vitamin B has been getting more attention as people look for ways to boost ...

Q. I was recently told my vitamin B12 level is low. How can I get it back into range? A. Vitamin B12 is one of those nutrients that quietly does a lot of heavy lifting in the body. Also known as ...

Vitamin B12 is essential for blood formation, nerve and brain function, and energy metabolism. Deficiency is common in vegetarians, older adults, and malabsorption states and causes fatigue, ...