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A vitamin B deficiency has been linked to mental health problems including depression

People with absorption problems, pernicious anemia, or digestive disorders sometimes need long-term treatment and regular monitoring

As one expert says, Regular monitoring is essential to tailor Vitamin B12 therapy to individual patient needs and prevent over- or under-treatment. Response-Based Dosing Strategies We adjust Vitamin B12 doses based on how well the patient responds

Conditions that can cause B12 depletion include: Celiac disease a severe reaction to eating gluten-containing grains Gastritis inflammation of the stomach lining