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  1. Vitamin B12 Deficiency: Causes, Symptoms, and Treatment - WebMD

    Apr 30, 2017 · Vitamin B12 is essential for good health, but some people may not be getting enough. WebMD tells you about symptoms of a vitamin B12 deficiency and how it can be treated.

  2. Vitamin B-12 - Mayo Clinic

    Aug 13, 2025 · Vitamin B-12 is a vitamin the body uses to make and support healthy nerve cells. It's also used to make healthy red blood cells and the genetic material inside cells called DNA. Vitamin B-12 …

  3. Vitamin B12 - Wikipedia

    Vitamin B12, also known as cobalamin or extrinsic factor, is a water-soluble vitamin involved in metabolism. [2] One of eight B vitamins, it serves as a vital cofactor in DNA synthesis and both fatty …

  4. Vitamin B12 - Health Professional Fact Sheet

    Vitamin B12 is a water-soluble vitamin that is naturally present in some foods, added to others, and available as a dietary supplement and a prescription medication. Because vitamin B12 contains the …

  5. What Happens to Your Body When You Have a Vitamin B12 Deficiency

    Dec 9, 2025 · Vitamin B12 deficiency can be caused by poor diet or malabsorption, leading to fatigue, muscle weakness, and memory problems.

  6. Signs and Symptoms of Vitamin B12 Deficiency - Healthline

    Dec 14, 2023 · Vitamin B12 is an essential nutrient that your body needs for processes like DNA synthesis, energy production, and central nervous system function (1). Studies suggest that up to …

  7. Vitamin B12 - The Nutrition Source

    Vitamin B12, or cobalamin, is naturally found in animal foods. It can also be added to foods or supplements. Vitamin B12 is needed to form red blood cells and DNA. It is also a key player in the …

  8. Vitamin B12: Purpose, benefits, and sources - Medical News Today

    Jun 11, 2025 · Vitamin B12 (cobalamin) is essential for the health of nerve tissue, brain function, and red blood cells. Sources include meat, eggs, and some yeast products. Vitamin B12 is the largest and …

  9. Vitamin B12 Deficiency: Symptoms, Causes & Treatment

    Sep 30, 2025 · What is vitamin B12? Vitamin B12 is an important nutrient that helps your body keep your nerve cells and red blood cells healthy. It also helps your body make DNA. Your body doesn’t …

  10. Vitamin B12: MedlinePlus Medical Encyclopedia

    Jan 21, 2025 · Vitamin B12 is a water-soluble vitamin. Water-soluble vitamins dissolve in water. After the body uses what it needs of these vitamins, leftover amounts leave the body through the urine. The …