Do Supplements Extend Life? No, But We Know What Does. And by How Long.

There's a good deal of interest in living longer, healthier lives, especially in the United States. How great an interest? Well, the U.S. market for dietary supplements is around $70 billion a year, almost as much as we spend on cancer drugs. But unlike the money spent on cancer treatment that extends or saves lives, there is no evidence that supplements extend lifespan at all.

Think about that.

How did we get so bamboozled? To start, the promise of longer life is pretty attractive, especially if it's as simple as swallowing a pill. And surely there must be at least something behind the claims made for supplements.

But it turns out that supplements in the U.S. are regulated very lightly compared with drugs: manufacturers do not have to prove efficacy or even safety of a supplement before going to market, and they can make broad claims about health and longevity as long as they avoid claiming to treat specific diseases. This arrangement was reached over 30 years ago as a legislative compromise between free access to supplements and safety, but over time this system has heavily tilted toward the free access side of this equation. By contrast, other Western nations have chosen to regulate supplements much more stringently than we do here in the USA.¹

As a result of these ground rules, in the USA the "longevity" story that the supplement gurus tell is pretty much pure marketing. Across large randomized trials and meta-analyses, common supplements show no reduction in all-cause mortality; some high-dose antioxidant regimens were actually associated with higher mortality.

The immense popularity of supplements is even more puzzling because we have years of very solid epidemiologic evidence telling us what actually is associated with longer lives. Why haven't these proven interventions gotten more attention? Likely because they simply aren't very exciting: really, they are just what your mother or grandmother have been telling you for years, repackaged.

Here's a summary graph of what contributes to longevity, expressed in years added to lifespan:

The graph above pulls what we know into a single frame. Along the horizontal axis is "Years of life added," and along the vertical axis are the usual suspects: genetics, smoking, diet, sex, exercise, sleep, sedentary time, and supplements.

Note that the two gray bars (genetics, sex) are just the cards you're dealt at birth. The blue bars are the behaviors you can control. And among these controllable factors the most important is simply not smoking, which can add about a decade of life compared with lifelong smokers. Mediterranean-style dietary patterns, regular exercise, adequate sleep, and not sitting for long periods, each contribute smaller but still substantial gains to lifespan, on the order of 2 to 6 extra years, when the healthiest with the least healthy groups are compared.

Perhaps you overlooked the effect of supplements in this graph: the bar for supplements at the very top of the graph is so close to zero it's easy to overlook. That reflects the meta-analytic reality. Randomized trials of antioxidant vitamins, multivitamins, and popular "longevity" compounds have repeatedly failed to show reductions in all-cause mortality; indeed, increased mortality was found with high-dose beta-carotene, vitamin A, or vitamin E. Large observational cohorts likewise find no survival advantage for supplement users after controlling for diet and other behaviors. When you try to put a "years of life added" number on supplements, there is simply nothing robust enough to even see on this plot.

By contrast, we can put approximate numbers on the behaviors that do move the needle. Moore and colleagues' pooled analysis of more than 650,000 adults suggests that moving from no leisure-time exercise to the highest activity category buys between 4 and 5 additional years of life even if begun after age 40.² Ekelund's accelerometer meta-analysis³ shows that those in the most active quartile have roughly a 60-70% lower risk of death during follow-up than those in the least active quartile. Katzmarzyk's modeling of sedentary time⁴ indicates that cutting daily sitting to under three hours could add about two years to U.S. life expectancy at birth. Similar estimates exist for Mediterranean-style diets and for not smoking.

So far, pretty standard. But if you have the resources, are there more intensive options for longer life available? Well, for the billionaire class there are a host of options, including "longevity clinics" that offer exhaustive genetic profiling, multi-day metabolic workups, cryotherapy, hyperbaric oxygen, off-label drug cocktails, as well as bespoke nutrition plans. And if this isn't expensive enough for you, there are startups offering so-called "young plasma" infusions, plasma taken from younger donors given to older recipients in the hope of rejuvenating tissues. And at the far edge of the imagination, some futurists and billionaires talk "seriously" about uploading consciousness into a computer or synthetic body to escape from biological aging altogether. More biologically based options are on offer as well. You can now pay cryonics companies to freeze your body (or, at a discount, just your brain) in liquid nitrogen in the hope that some future technology will be able to repair the damage and "reanimate" you. For the rest of us, well we have to slack our lust for immortality with much more affordable "supplements".

But on the horizon is real research that may change everything we think we know about aging, because it turns out we don't start out young; we work our way back to it.⁵ Embryos are formed from eggs and sperm that are as old and damaged as the parents, yet somehow early in development embryo cells appear to scrub away accumulated damage and epigenetic "rust," effectively resetting to a more youthful state. Immensely well-funded companies (e.g. Altos Labs) are working to use this approach to rejuvenate adult tissues. In mice, cellular "reprogramming" has restored gray fur, improved muscle strength, and even revived failing organs. And in humans a safety trial aimed at age-related eye disease has begun. We know that babies are special: operations performed while a baby is still in utero heal without scarring, as if the tissues of a neonate still remember how to regenerate perfectly. If we can figure out how babies do this, perhaps we can all reset our age to a more youthful number. It seems we have much to learn from babies.

But for now, we know what extends life, and the answer is hiding in plain sight: don't smoke, eat a healthful diet, move regularly, sleep enough, and avoid long, uninterrupted bouts of sitting. These interventions are not glamorous, but they are inexpensive and available to all of us. And unlike supplements, they have the one thing any serious longevity strategy should demand: scientific proof.

 

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¹ Starr, R. R. (2015). Too little, too late: Ineffective regulation of dietary supplements in the United States. American Journal of Public Health, 105(3), 478–485. https://doi.org/10.2105/AJPH.2014.302348

² Moore, S. C., Patel, A. V., Matthews, C. E., Berrington de González, A., Park, Y., Katki, H. A., Linet, M. S., Weiderpass, E., Visvanathan, K., Helzlsouer, K. J., Thun, M., Gapstur, S. M., Hartge, P., & Lee, I.-M. (2012). Leisure time physical activity of moderate to vigorous intensity and mortality: A large pooled cohort analysis. PLOS Medicine, 9(11), Article e1001335. https://doi.org/10.1371/journal.pmed.1001335

³ Ekelund, U., Tarp, J., Fagerland, M. W., Steene-Johannessen, J., Hansen, B. H., Jefferis, B. J., Whincup, P. H., Diaz, K. M., Hooker, S., Howard, V. J., Chernofsky, A., Larson, M. G., Spartano, N., Vasan, R. S., Dohrn, I.-M., Hagströmer, M., Edwardson, C., Yates, T., Shiroma, E. J., … Lee, I.-M. (2020). Joint associations of accelerometer-measured physical activity and sedentary time with all-cause mortality: A harmonised meta-analysis in more than 44,000 middle-aged and older individuals. British Journal of Sports Medicine, 54(24), 1499–1506. https://doi.org/10.1136/bjsports-2020-103270

⁴ Katzmarzyk, P. T., & Lee, I.-M. (2012). Sedentary behaviour and life expectancy in the USA: A cause-deleted life table analysis. BMJ Open, 2(4), Article e000828. https://doi.org/10.1136/bmjopen-2012-000828

⁵ Dominus, S. (2026, April 27). Longevity science is overhyped. But this research really could change humanity. The New York Times Magazine. https://www.nytimes.com/2026/04/27/magazine/cell-rejuventation-biotech-longevity-research-altos-labs.html