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O (Outcome): Primary outcome: changes in serum Vitamin B12 levels, clinical improvement of Vitamin B12 deficiency symptoms

Your provider will adjust the schedule based on follow-up blood work and symptom response

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Some protocols split the daily dose into two administrations (morning and evening) to maintain more consistent plasma levels, though definitive human PK data remain sparse as of 2026

If youre struggling with restless nights or early fatigue, adding B12 to your routine may help you sleep better within days, as shown in this study on B12s effect on sleep regulation