The diabetes drug metformin increases human lifespan by up to 7 years.
See the scientific wording
The diabetes drug metformin extends human lifespan by up to 7 years.
Correlational — new studies may shift this
ObservationalOne good-quality study links this claim to the outcome, but causation is not established.
What the research says
1 study reviewedSupporting (1)
Cohort StudyHuman2025
This study found that older women with diabetes who took metformin were less likely to die before age 90 than those who took another diabetes drug, suggesting metformin might help people live longer. It doesn't prove it adds exactly 7 years, but it does support the idea that it could help people live longer.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
Scores reflect study quality, not just count.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
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The diabetes drug metformin increases human lifespan by up to 7 years.
Evidence from Studies
Last searched 2mo ago
Supporting (1)
Community contributions welcome
This study found that older women with diabetes who took metformin were less likely to die before age 90 than those who took another diabetes drug, suggesting metformin might help people live longer. It doesn't prove it adds exactly 7 years, but it does support the idea that it could help people live longer.
Contradicting (0)
Community contributions welcome
Score Breakdown
No multi-axis breakdown available yet. The overall Pro / Against score above is the best signal.
- No clinical evidence is available; the score reflects mechanistic plausibility only.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Systematic Review of Long-Term Metformin Use and All-Cause Mortality in Humans
Population: Adults aged 50–80 with type 2 diabetes; Intervention: Long-term metformin use (≥10 years); Comparator: No metformin use or other antidiabetic drugs; Outcome: All-cause mortality; Duration: Minimum 10 years of follow-up.
Double-Blind Randomized Trial of Metformin vs Placebo on Lifespan in Non-Diabetic Adults
Population: Healthy adults aged 60–75; Intervention: Daily metformin (1000 mg); Comparator: Placebo; Outcome: All-cause mortality; Duration: Minimum 10 years.
Prospective Cohort Study of Metformin Use and Longevity in Diabetic and Non-Diabetic Populations
Population: 10,000 adults aged 50+ with and without diabetes; Intervention: Naturalistic metformin use; Comparator: Non-users; Outcome: Time to death; Duration: 15 years of follow-up.
Long-Term Metformin Administration and Lifespan Extension in Mice and Non-Human Primates
Population: Young adult C57BL/6 mice and rhesus monkeys; Intervention: Daily metformin (dose equivalent to human 1000 mg); Comparator: Control diet; Outcome: Median and maximum lifespan; Duration: 2–3 years in mice, 10+ years in primates.
Expert Consensus Statement on Metformin's Potential Role in Human Longevity
Delphi panel of 15 gerontologists, endocrinologists, and epidemiologists evaluating available evidence and providing consensus on metformin's potential to extend human lifespan.