Vitamin B12 Deficiency on Long-Term Metformin and Proton Pump Inhibitors: A Case for Scheduled Testing. Journal of Clinical Nutrition and Health, [S. l.], v. 4, n. 1, p. 1–6, 2023. DOI: 10.5281/zenodo.22278558. Disponível em: https://pragmajournals.org/index.php/JCNH/article/view/247. Acesso em: 30 oct. 2026.