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  1. Vitamin B12: Overview, Uses, Side Effects, Precautions ... - WebMD

    Taking vitamin B12 by mouth, as a shot, or inhaling through the nose can treat and prevent vitamin B12 deficiency. Vitamin B12 shots can only be given by a healthcare provider.

  2. Methylcobalamin vs. Cyanocobalamin: What’s the Difference?

    May 12, 2020 · Methylcobalamin and cyanocobalamin are the two most common sources of vitamin B12. We look at their main differences and their benefits.

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

    Oct 13, 2025 · While rare, B12 deficiency can cause failure to thrive and delays in developmental milestones for infants. If left untreated, vitamin B12 deficiency could lead to permanent brain …

  4. Vitamin B12 Deficiency Anemia - Johns Hopkins Medicine

    Vitamin B12 deficiency anemia is a condition in which your body does not have enough healthy red blood cells, due to a lack (deficiency) of vitamin B12. This vitamin is needed to make red …

  5. Vitamin B12 Deficiency - Causes, Symptoms, Diagnosis, and …

    Apr 25, 2025 · Vitamin B12 deficiency occurs when the body does not have enough of this essential vitamin to meet its needs. This deficiency can result from various factors, including …

  6. How Much Vitamin B12 Should You Take Per Day? - Health

    Apr 29, 2025 · The amount of vitamin B12 you need daily depends on age, sex, and factors like pregnancy. Adequate B12 levels keep your nerves and blood healthy.

  7. Treatment of vitamin B12 and folate deficiencies - UpToDate

    This topic reviews the treatment of vitamin B12 and folate deficiencies, including the route and duration of therapy, monitoring, and expected hematologic and neurologic response.

  8. 10 ways to increase vitamin B12 | HealthShots

    Aug 17, 2024 · Vitamin B12 is crucial for maintaining the myelin sheath, a protective coating around nerve fibers. Vitamin B12 deficiency can lead to neurological issues, including tingling, …

  9. Vitamin B12 | Sources, Deficiency & Health Effects | Britannica

    Oct 16, 2025 · vitamin B12, a complex water-soluble organic compound that is essential to a number of microorganisms and animals, including humans. Vitamin B 12 aids in the …

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

    If the typical vitamin B-12 sources are not part of your regular diet or if your body has difficulty absorbing enough B-12, there are other options.