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UK guidance (MHRA and NICE) advises checking B12 levels in patients on metformin who develop symptoms of deficiency (anaemia, neuropathy) and considering periodic monitoring in those on long-term therapy
Frequency and Duration of IM Treatment How often and for how long you get shots depends on why you need them and how youre doing
Available online at: (Accessed May 23, 2023)
The rationale focuses on local gut effects rather than systemic distribution
Your health history, goals, medications, and eligibility are reviewed
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