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Description
Some of them are as follows: Small intestine bacterial overgrowth (SIBO): The harmful bacteria use the available B12 before it has been absorbed by the small intestine, thereby leading to a deficiency

Check your refrigerator's temperature to ensure it's in the optimal range
Monitoring and Managing Vitamin B12 Levels During Treatment Serum vitamin B12 and related biomarkers are measured through blood tests

(1998) focused on a wide range of possible adverse effects