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

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, ...

Can vitamin B12 deficiency be a sign of cancer? Learn the symptoms, risks, connection to cancer, treatments, and why this ...

Pernicious anemia is an autoimmune condition in which the body cannot absorb vitamin B12 properly. A person with pernicious anemia requires lifelong vitamin B12 supplementation. Vitamin B12 is ...

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 ...