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Vitamin B 12 status of patients treated with metformin: a cross-sectional cohort study

10.1007/s10123-018-0027-9 57 DianatM.SadeghiN.BadaviM.PanahiM.Taheri MoghadamM

J Control Release 182:99110
Regular monitoring of vitamin B12 levels is recommended for those on long-term supplementation to ensure adequate dosing

Thats why people look into BPC-157 and other alternatives
