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If you're in UK, I recommend reading all these documents below UK B12 documents BSH Cobalamin and Folate Guidelines b-s-h.org.uk/guidelines/gui
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Oral research-planning amounts are usually higher than subcutaneous amounts to account for absorption differences
1 If anti-intrinsic factor results are negative but suspicion for pernicious anemia remains, an elevated serum gastrin level is consistent with the diagnosis
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