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

There are many different vitamins and nutrients that keep your body healthy, from your hair and nails to your heart and brain to your bones. Vitamin B12 is an unsung hero in the world of nutrients, ...

B vitamins do a lot in the body, including helping to support your energy levels. But the B vitamin complex is large, and some of these vitamins, like B12, get more attention than others. With that, ...

Blumberg is a contributor for TIME. Blumberg is a contributor for TIME. Everyone needs vitamin B12: It helps the body produce red blood cells and maintain healthy brain function, along with so many ...