Patients should also be aware that certain medicationssuch as proton pump inhibitors (PPIs) and metformincan interfere with B12 absorption, though this is less relevant once on injection therapy
18 Table 4 Time to Improvement of Abnormalities in Vitamin B12 Deficiency After Initiation of Treatment A 2005 Cochrane review involving 108 patients with vitamin B 12 deficiency found that high-dose oral replacement (1 mg to 2 mg per day) was as effective as parenteral administration for correcting anemia and neurologic symptoms
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Mood, Focus, and Brain Support Beyond physical vitality, B12 plays a critical role in neurological health