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Specifically, eligible studies included participants (P) with a confirmed diagnosis of vitamin B12 deficiency, interventions (I) involving oral or sublingual vitamin B12 administration, comparators (C) using intramuscular supplementation, and outcomes (O) reporting changes in serum vitamin B12 or homocysteine levels

A common protocol for patients with a B12 deficiency may be 1,000 mcg daily for one week, then the same dosage once weekly, and then the same dosage once per month after the deficiency has been addressed

These symptoms can sometimes discourage patients from continuing their treatment

the research compound is the actual subject of study