RT Journal Article SR Electronic T1 Safety update: metformin and vitamin B12 JF Drug and Therapeutics Bulletin JO Drug Ther Bull FD BMJ Publishing Group Ltd SP 131 OP 131 DO 10.1136/dtb.2022.000039 VO 60 IS 9 YR 2022 UL http://dtb.bmj.com/content/60/9/131.abstract AB Overview of: Medicines and Healthcare products Regulatory Agency. Metformin and reduced vitamin B12 levels: new advice for monitoring patients at risk. Drug Safety Update 2022;15(11):2–5.