Vitamin B12

Physiological Functions

1. Hematopoiesis (Blood Cell Formation)

    

   Vitamin B12 works synergistically with folate to support the synthesis of DNA in rapidly dividing cells, especially red blood cells. It helps convert homocysteine to methionine and maintains the normal maturation of red blood cells. Deficiency can lead to megaloblastic anemia, characterized by large, immature red blood cells that cannot function properly.
    
2. Neurological System Health

    

   This vitamin is critical for maintaining the integrity of the myelin sheath—a protective layer that surrounds nerve fibers and ensures efficient transmission of nerve signals. A lack of vitamin B12 can damage the myelin sheath, leading to neurological symptoms such as numbness and tingling in the hands and feet, difficulty walking, memory loss, and even cognitive decline in severe cases.
    
3. Homocysteine Regulation

    

   Vitamin B12, along with folate and vitamin B6, helps break down homocysteine in the blood. Elevated homocysteine levels are associated with an increased risk of cardiovascular diseases, such as heart attacks and strokes; adequate B12 intake helps keep homocysteine levels within a healthy range.