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

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

    Dec 28, 2025 · 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 …

  6. Vitamin B12 Benefits, Potential Risks and If You're Getting ...

    2 days ago · If you're considering a vitamin B12 supplement because of certain dietary restrictions, medical conditions or your age, this is what you need to know.

  7. Vitamin B12: MedlinePlus Medical Encyclopedia

    Vitamin B12, like the other B vitamins, is important for protein metabolism. It helps in the formation of red blood cells and in the maintenance of the nervous system.

  8. Vitamin B12 Deficiency: Symptoms, Causes & Treatment

    Vitamin B12 Deficiency Vitamin B12 deficiency is a treatable condition that happens if you aren’t consuming enough vitamin B12 in your diet or if your body isn’t absorbing it properly. Vitamin B12 …

  9. 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 …

  10. 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 …