Metformin And Vitamin B12 Status In Patients: A Systematic Review. Journal of Pharmaceutical Negative Results, [S. l.], p. 5212–5218, 2022. DOI: 10.47750/pnr.2022.13.S08.683. Disponível em: https://mail.pnrjournal.com/index.php/home/article/view/10266.. Acesso em: 9 jun. 2026.