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Description
The current sate of knowledge has moved on in 30 odd years and yet B12 maintenance dose has since worsened

Niswender, K
In this review, we summarise the complex metabolic pathway of Vitamin B12, the inherited and acquired causes of Vitamin B12 deficiency and subsequently highlight the disparate international practice of prescribing Vitamin B12 replacement therapy
Side Effects and Therapeutic Effects

Ross SE, Hemati N, Longo KA, Bennett CN, Lucas PC, Erickson RL, et al