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B12 plays a foundational role in red blood cell formation, neurological function, and energy metabolism

Here is a revised and more accurate explanation of the reasons a UK GP surgery might refuse to give a B12 injection a day earlier than scheduled, incorporating the points youve raised and providing a more scientifically grounded perspective: 1

Medications know to cause bone marrow suppression (e.g., myelosuppressive antineoplastic agents) may result in a blunted or impeded response to methylcobalamin, vitamin B12 therapy

Low Birth Weight : Inadequate levels of Vitamin B12 during pregnancy can result in the baby being born with low birth weight