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

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.

Vitamin B12 is important for the health of your nervous system and your red blood cells. It can be found in many animal products and fortified foods. In the United States, about 6% of people under age ...

This essential vitamin is generally considered safe, even at high doses. However, most people get enough B12 through diet alone, and unnecessary supplementing may lead to negative side effects.

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). Some research suggests that people ...

Metformin is the first therapy for almost everyone with type 2 diabetes, but studies show that the drug creates a risk of vitamin B12 deficiency. Your clinician should test your B12 levels regularly ...

Vitamin B12 deficiency often begins in the brain, causing subtle changes in thinking and mood. These early signs can include ...