Metformin has been prescribed for type 2 diabetes for decades. It is cheap, familiar and not the sort of drug usually associated with the rapidly growing market for longevity treatments, supplements and anti-aging technology. Yet researchers are increasingly asking a much bigger question: could metformin also slow some of the biological processes involved in aging?
A new scientific review has brought together evidence from laboratory studies, animal research and human data to examine whether this long-established diabetes drug could eventually be repurposed to help people stay healthier for longer.
What has diabetes treatment got to do with aging?
Potentially, quite a lot. Metformin lowers glucose and improves insulin sensitivity, but researchers believe its effects may reach much further.
Metformin affects how cells manage energy and may also help them clear out and recycle damaged parts. Researchers have also linked it with changes in inflammation, cellular aging, DNA regulation and the gut microbiome.
Together, these effects touch on some of the same biological processes scientists are studying to understand not just individual age-related diseases, but why our bodies age in the first place.
So, does metformin actually slow aging?
The evidence is intriguing, but far from settled. Studies in worms and mice have reported longer lifespans, while research in male monkeys has suggested that metformin may produce signs of younger biological age in several tissues.
Human studies have produced interesting signals too, particularly among people with diabetes taking metformin. The problem is that most of this evidence comes from people who already have diabetes, making it difficult to know whether metformin itself is slowing aging or whether people are benefiting because their glucose and metabolic health are better controlled.
Some earlier claims suggesting people with diabetes taking metformin could even outlive people without diabetes have also been challenged.
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There isn’t any strong evidence that healthy people should start taking metformin simply to live longer yet, but that doesn’t make the research insignificant.
Longevity science is often associated with expensive new drugs, supplements and experimental treatments. Metformin is almost the opposite: an old, widely used diabetes medicine that researchers already understand reasonably well. If it turns out to influence ageing as well as glucose, it could become one of the more surprising examples of an existing drug finding an entirely new purpose.
For now, metformin remains a diabetes treatment with an interesting second career under investigation. The bigger question is whether the effects seen in laboratories, animals and observational studies can ever be shown to make a meaningful difference to how long, and how well, humans live.
For now, the idea of metformin as a genuine anti-aging treatment remains unproven.
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