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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. 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 …

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

    Jan 8, 2026 · 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. 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. Recognizing and Treating Vitamin B12 Deficiency - Health

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

  9. The A list for vitamin B-12 sources - Harvard Health

    How to make sure you get enough from everyday foods Vitamin B12, required for proper brain function and a host of chemical reactions within the body, is found naturally only in animal foods. But if the …

  10. Vitamin B12 Deficiency: Symptoms, Causes & Treatment

    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 make vitamin B12 …