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Tag: B12 malabsorption

September 18, 2026

Vitamin B12 Deficiency and Autoimmune Gastritis: Understanding Your Blood Tests

How B12, MMA, CBC, intrinsic factor antibodies, and iron studies can clarify deficiency and absorption problems—and when each test is useful.

Vitamin B12 deficiency develops when the body does not have enough usable B12 to support normal nerve function and blood-cell production. Autoimmune gastritis is one possible cause: immune damage to the stomach lining can interfere […]

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