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

    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. …

  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 …

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

    Dec 9, 2025 · Signs of a vitamin B12 deficiency include anemia, neuropathy, and more. Vitamin B12 deficiency can cause symptoms of anemia, nerve problems, and sensory changes that …

  5. 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 …

  6. Vitamin B12 Benefits and Side Effects: Dosage & Safety

    Aug 21, 2025 · Vitamin B12 (cobalamin) is an essential water-soluble vitamin that your body can’t make on its own. It supports core processes like red blood cell production, nerve protection, …

  7. How Much Vitamin B12 Is Too Much? - Healthline

    May 8, 2025 · Vitamin B12 plays many crucial roles in the body. Some think taking megadoses is best for their health. Learn more about how much vitamin B12 is too much.

  8. Vitamin B12 - Health Professional Fact Sheet

    Vitamin B12 overview for health professionals. Research health effects, dosing, sources, deficiency symptoms, side effects, and interactions here.

  9. Recognizing and Treating Vitamin B12 Deficiency - Health

    4 days ago · Vitamin B12 deficiency causes fatigue, breathlessness, and pale skin. Autoimmune diseases and diet are common causes that require medical care.

  10. Vitamin B12: MedlinePlus Medical Encyclopedia

    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 …