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Key Takeaways Metformin can interfere with vitamin B12 absorption, leading to deficiency in up to 41% of long-term users

If the patient is suspected to be sensitive to cobalt or other components of cobalamin, an intradermal test dose is recommended.[12][15] Several laboratory tests should be performed prior to treatment with cyanocobalamin, including serum vitamin B12, folate, iron, hematocrit, and reticulocyte count

They are, at best, an adjunct one that might offer significant benefit for carefully selected patients under qualified medical supervision

Activity Spectrum of the Bioactive Forms The following table shows the activity spectrum on both of the bioactive forms of B12: methylcobalabim and adenosylcobalamin

It also improves cognitive function, promoting better concentration and memory