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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. 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 …

  4. 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 …

  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.

  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, and DNA …

  7. 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 often …

  8. What Happens to Your Body When You Take Vitamin B12 - EatingWell

    Oct 13, 2025 · Vitamin B12 is necessary for healthy blood cells and brain and nerve cell development. The RDA for vitamin B12 for adults 19 and older is 2.4 micrograms per day. You'll find vitamin B12 in …

  9. Vitamin B12 is found naturally in a wide variety of animal foods, and manufacturers add it to some fortified foods. Plant foods have no vitamin B12 unless they are fortified. You can get recommended …

  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 body stores …