Metformin
Metformin Hydrochloride (Biguanide)
Metformin is the world's most prescribed diabetes drug — a biguanide compound approved in the UK in 1958 and the US in 1995. It lowers blood sugar primarily by suppressing hepatic glucose production via AMPK activation, without causing weight gain or hypoglycemia. Sixty years of clinical use have produced one of the densest evidence bases in medicine. Its most intriguing effects may still lie ahead: the TAME trial is testing whether metformin can slow human aging itself.
How to read this sphere
The percentage on each node is the confidence level that a particular benefit or side effect is actually real — higher means more high-quality studies back it up. Once confidence crosses ~80%, the effect is considered Pacified: generally accepted as true by the scientific community.
Position reflects confidence: nodes closer to the center have stronger evidence; nodes near the edge are still speculative. As more studies are published, nodes migrate inward — or disappear entirely if the evidence collapses.
Metformin has been studied for over 60 years, so its sphere looks very different from a newer drug's: most nodes sit tightly packed in the Core — a dense cluster of effects that science has thoroughly verified. The nodes near the edge represent genuinely open questions, like whether metformin slows aging itself, which is only now being tested in formal human trials.
All Sources
- UKPDS 34: Effect of Intensive Blood-Glucose Control with Metformin on Complications in Overweight Patients with Type 2 Diabetes↗The Lancet1998re: Glycemic Control
- UKPDS: 10-Year Follow-Up of Intensive Glucose Control in Type 2 Diabetes↗New England Journal of Medicine2008re: Cardiovascular Protection
- Reduction in the Incidence of Type 2 Diabetes with Lifestyle Intervention or Metformin↗New England Journal of Medicine2002re: Diabetes Prevention
- Metformin Blunts Muscle Hypertrophy in Response to Progressive Resistance Exercise Training in Older Adults: The MASTERS Trial↗Aging Cell2019re: Exercise Adaptation Blunting
- Efficacy and Side Effect Profile of Different Formulations of Metformin: A Systematic Review and Meta-Analysis↗Diabetes Therapy2021re: GI Distress
- Associations Between Metformin Use and Vitamin B12 Levels, Anemia, and Neuropathy in Patients with Diabetes: A Meta-Analysis↗Journal of Diabetes2019re: Vitamin B12 Depletion
- The Impact of Metformin With or Without Lifestyle Modification vs Placebo on PCOS: Systematic Review and Meta-Analysis of RCTs↗European Journal of Endocrinology2023re: PCOS Treatment
- The Impact of Metformin on Weight and Metabolic Parameters in Patients with Obesity: Systematic Review and Meta-Analysis of RCTs↗Diabetes, Obesity and Metabolism2024re: Weight Reduction
- Metformin Use Is Associated with a Reduced Risk of Cognitive Impairment in Adults with Diabetes: Systematic Review and Meta-Analysis↗Frontiers in Neuroscience2022re: Cognitive Protection
- Metformin Use Associated with Reduced Risk of Dementia in Patients with Diabetes: Systematic Review and Meta-Analysis↗Journal of Alzheimer's Disease2018re: Cognitive Protection
- Association of Metformin Use and Cancer Incidence: A Systematic Review and Meta-Analysis↗JNCI: Journal of the National Cancer Institute2024re: Cancer Risk Reduction
- Understanding and Overcoming Metformin Gastrointestinal Intolerance↗Diabetes, Obesity and Metabolism2017re: GI Distress
- Lactic Acidosis Associated with Metformin in Patients with Diabetic Kidney Disease↗Medical Archives2022re: Lactic Acidosis Risk
- Metformin Decelerates Aging Clock in Male Monkeys↗Cell2024re: Anti-aging / Longevity
- Metformin Alters Skeletal Muscle Transcriptome Adaptations to Resistance Training in Older Adults↗Aging2020re: Exercise Adaptation Blunting
Last updated: 2026-04-29 · Data compiled from PubMed, ClinicalTrials.gov, FDA, and EMA databases.