What Causes Vitamin B12 Deficiency?
Vitamin B12 deficiency displays symptoms of fatigue, tiredness, and mental issues like poor memory. Learn about the causes of B12 deficiency and its role in red blood cell production.

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References
- Vitamin B12 - Health Professional Fact Sheet https://ods.od.nih.gov/factsheets/VitaminB12-HealthProfessional/
- Pernicious Anemia - StatPearls - NCBI Bookshelf https://www.ncbi.nlm.nih.gov/books/NBK540989/
- Physiology, Gastric Intrinsic Factor - StatPearls - NCBI Bookshelf https://www.ncbi.nlm.nih.gov/books/NBK546655/
- Proton Pump Inhibitors, H2-Receptor Antagonists, Metformin, and Vitamin B-12 Deficiency: Clinical Implications - PMC https://pmc.ncbi.nlm.nih.gov/articles/PMC6054240/
- Association between metformin and vitamin B12 deficiency in patients with type 2 diabetes - PMC https://pmc.ncbi.nlm.nih.gov/articles/PMC10236989/
- Nutrition in Patients with Inflammatory Bowel Diseases: A Narrative Review - PMC https://pmc.ncbi.nlm.nih.gov/articles/PMC8879392/
- Neuropsychiatric Disorders Associated With Vitamin B12 Deficiency: An Autobiographical Case Report - PMC https://pmc.ncbi.nlm.nih.gov/articles/PMC8858590/
- Hydroxocobalamin - StatPearls - NCBI Bookshelf https://www.ncbi.nlm.nih.gov/books/NBK557632/