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    Vitamin B12 deficiency anemia occurs when there is a lack of vitamin B12, which is essential for the production of red blood cells. It can be caused by problems with gut absorption or conditions like pernicious anemia. Symptoms include weakness, fatigue, and intestinal issues.
    verywellhealth.com+2
    3 来源
    Vitamin B12 Deficiency: Symptoms, Treatment and More - Verywell Health
    Vitamin B12 plays a role in the production of red blood cells (RBCs). These cells carry oxygen through the body. Oxygen helps your body produce energy. Vitamin B12 deficiency leads…
    Verywell Health
    https://www.verywellhealth.com/vitamin-b12-deficiency-2488570
    Anemia - Vitamin B12–Deficiency Anemia | NHLBI, NIH
    You can get vitamin B12 deficiency if you can’t absorb vitamin B12 due to problems with your gut or if you have pernicious anemia, which makes it difficult to absorb vitamin B12 fr…
    National Institutes of Health (NIH)
    https://www.nhlbi.nih.gov/health/anemia/vitamin-b12-deficiency-anemia
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    Vitamin B-12 - Mayo Clinic
    Older adults and people with digestive tract conditions that affect absorption of nutrients also are susceptible to vitamin B-12 deficiency. Left untreated, a vitamin B-12 deficien…
    Mayo Clinic
    https://www.mayoclinic.org/drugs-supplements-vitamin-b12/art-20363663
    verywellhealth.com
    nih.gov
    mayoclinic.org