Metformin Selectively Lowers Vitamin B12 but Not Other Vitamin Levels: Clinical Implications for Long-Term Therapy
A 200‑patient cross‑sectional study found metformin use tripled the odds of vitamin B12 deficiency without affecting vitamins A, B1, B6, B9, C or E, highlighting the need for targeted B12 monitoring in long‑term metformin therapy.



















