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Abstract Background This systematic review and network meta-analysis aimed to evaluate the three different administration routes of vitamin B12: oral, intramuscular (IM), and sublingual (SL) routes
Recommended Frequency: Weekly or as needed
a shorter needle risks depositing the B12 into fat, which slows absorption
Some NHS/ICB guidance notes oral options for dietary-related deficiency, and that long-term injection schedules depend on the cause
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