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.

Last updated
2026-04-29

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.

8
Benefits
4
Malefices
16
Sources
71%
Avg. Confidence
BENEFITSMALEFICESCore80–100%Inner Mantle60–80%Outer Mantle40–60%Crust10–40%Anti-aging / Lon… (C.L. 30%)Cancer Risk Redu… (C.L. 45%)Cognitive Protec… (C.L. 52%)Weight Reduction (C.L. 70%)PCOS Treatment (C.L. 76%)Diabetes Prevent… (C.L. 88%)Cardiovascular P… (C.L. 90%)Glycemic Control (C.L. 99%)Exercise Adaptat… (C.L. 35%)Lactic Acidosis … (C.L. 85%)Vitamin B12 Depl… (C.L. 88%)GI Distress (C.L. 95%)

All Sources

Phase III RCT4 sources
Meta-Analysis7 sources
Observational Study4 sources
Regulatory1 source

Last updated: 2026-04-29 · Data compiled from PubMed, ClinicalTrials.gov, FDA, and EMA databases.