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  1. 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 …

  2. 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.

  3. Vitamin B12 Foods: 12 Great Sources - Healthline

    Feb 17, 2026 · Your body can’t make vitamin B12, so you must get it from your diet or supplements. Here are 12 foods rich in vitamin B12 to consider adding to your diet.

  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. We Asked a Doctor What Vitamin B12 Actually Does for Your Body

    Apr 16, 2026 · While B12 doesn't produce energy, it provides essential tools to allow your body to unlock energy from the food you eat. It also supports the necessary building blocks of other bodily reactions …

  6. Vitamin B12 Deficiency: Symptoms, Causes & Treatment

    Vitamin B12 is an important nutrient that helps your body make red blood cells and DNA, the genetic material in all of your cells. It’s essential to how your body functions. Without treatment, vitamin B12 …

  7. Vitamin B12 or folate deficiency anaemia - NHS

    Vitamin B12 is found in meat, fish, eggs, dairy products and specially fortified foods. Good sources of folate include green vegetables, such as broccoli, brussels sprouts and peas.

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

    Apr 30, 2026 · Learn vitamin B12 benefits, who may need it, whether it boosts energy, dosage for adults and seniors, B12 shots, side effects, and what high B12 levels mean.

  9. Vitamin B12 - Health Professional Fact Sheet - Office of Dietary ...

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

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

    Oct 13, 2025 · Vitamin B12 is essential for numerous body functions. Read on for what vitamin B12 is, the benefits, potential risks, side effects and more.