Metformin, commonly prescribed for type 2 diabetes, is known to reduce B12 absorption over time, as highlighted in MHRA safety updates
Nevertheless, use of metformin may decrease vitamin B 12 status: a meta-analysis of four short-term intervention trials (up to 4 months duration) in patients with type 2 diabetes found that metformin use decreased serum cobalamin concentrations by 57 pmol/L, which could have clinical implications if such patients have suboptimal vitamin B 12 status (146)
Patient safety is always important, and understanding vaccine reactions and prevention strategies is imperative
In this study, B12 levels were 244 pmol/l or more in all patients at baseline, but in those who improved, B12 levels almost quadrupled, whilst in non-responders B12 levels went up by only 50%
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Approximately one year later, he experienced a severe worsening of his previously very mild neuropathy, and lab evaluation yielded a serum B12 of 220 pmol/l (which is normal, remember!?), but an elevated serum MMA of 1300 nmol/l, supporting the existence of true B12 deficiency