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MedicationMetformin
Last scientific update: jun 2026
Metformin is the most used medicine for type 2 diabetes. It lowers blood sugar and is also being studied as a possible anti-aging agent.
Metformin at a glance
WorksYes, against high blood sugarStrong
LifespanUncertain in healthy peoplePreliminary
SafeYes, well establishedStrong
UseBy prescription, daily pill
Metformin is safe and effective in diabetes; the idea that it extends life in healthy people is still unproven.
31 studies4 answersupdated jun 2026
Evidence per claim
Effect on lifespan in healthy people is uncertain
View evidence →Improves blood sugar in insulin resistance
View evidence →Berberine is called the natural metformin
View evidence →Studied via mechanisms such as autophagy
View evidence →Practical use
For whom
People with type 2 diabetes or prediabetes, by prescription.
Not for whom
Not proven useful for healthy people purely against aging.
Usual dose
Daily pill at an increasing dose, always by prescription.
Key caveats
Main side effect is gut upset; long-term use can lower vitamin B12 absorption.
What we know, and don't
Known
Safe and effective in diabetes
Lowers blood sugar reliably
Well studied over decades
Not yet
Whether it extends life in healthy people
The best dose for anti-aging
Whether it blunts training effects
Common misconceptions
"Metformin is an anti-aging pill for everyone."
Not shown. In healthy people that is not yet proven.Strong evidence
"It is dangerous for the liver."
False. With normal kidney and liver function it is safe.Moderate evidence
How Metformin connects
Conditions
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