Medically reviewed by Jonathan Purtell, RDN Key Takeaways Vitamin B12 supports energy, red blood cell formation, nerve ...

Vitamin B12 deficiency can be caused by poor diet or malabsorption, leading to fatigue, muscle weakness, and memory problems.

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." It’s normal to wonder if you’re meeting your nutritional needs if you’re feeling off in your day-to-day.

Some common medications can lead to vitamin and mineral deficiencies. Learn which medications can interact in this way.

This comprehensive review examines vitamin B12 absorption, physiological roles, deficiency states, and dietary sources, with ...

An icon in the shape of a lightning bolt. Impact Link High levels of vitamin B12 in a person's blood are associated with an increased risk of early death, according to research published last month in ...

The study cautioned older women to be careful not to take high doses of the vitamins Rachel DeSantis is a senior writer on the music team at PEOPLE. She has been working at PEOPLE since 2019, and her ...