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At high doses, a small proportion of B12 is absorbed passively through the gut lining without requiring intrinsic factor, which is sufficient to maintain adequate levels in many patients

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While studies show a slightly higher absorption in the stomach than upper legs and arms, healthcare professionals mention that does not make a significant difference

For those considering IM vitamin therapy, consult with a medical professional first to assess your current health needs and see how the right treatment could benefit you

If your doctor is hesitant, then they should at a minimum comply with the NICE guidelines, meaning an injection every two days until there is no further improvement in symptoms