Ozempic and other interventions: what the evidence actually supports
GLP-1 drugs like Ozempic are famous as weight-loss medications, but for people over 40 who have heart or kidney disease, their value is now well documented. What they can do for healthy people, and where other widely discussed compounds really stand, is a different story.
Ozempic is the most talked-about drug in the world of interventions and supplements, yet the question is rarely asked precisely enough. For whom does it actually work, and when is it mostly hype? The same goes for rapamycin, metformin and the classic supplements that longevity enthusiasts have been taking for years. Here is what the evidence says right now, and nothing beyond that.
Ozempic works best where you are already sick, not where you want to stay healthy
The evidence for GLP-1 drugs like semaglutide (Ozempic/Wegovy) is most robust for people who already have cardiovascular disease, reduced kidney function or fatty liver disease. Those conditions are common in people over 40, and the benefits hold up even at older ages. There are encouraging signals that GLP-1 drugs may help prevent dementia or slow aging in healthy people, but those signals have not yet been confirmed in large, controlled trials. Muscle loss is a real risk, particularly for older adults who already have less muscle mass to spare. Using these drugs outside their approved indications requires medical supervision.
In the background, a successor is already in development. In indirect comparisons, retatrutide appears to produce greater weight loss than semaglutide -- around 22 percent versus around 14 percent -- but a direct head-to-head clinical trial does not yet exist. The drug is not approved, and its long-term safety profile is unknown. If you are looking for treatment today, you are choosing from what is actually available.
Rapamycin: impressive in mice, cautious in humans
Rapamycin demonstrably and convincingly extends lifespan in mice. In humans, the early signals are cautiously positive for immune function, skin and the cardiovascular system, but large, long-term studies in healthy people are completely absent. Infections and elevated blood lipid levels are not theoretical side effects -- they are documented risks, especially in people with existing conditions. Use outside of clinical trials cannot be justified at this point. The ongoing trials are worth waiting for.
Metformin protects against disease, but does it actually slow aging?
Metformin has a long track record as a diabetes drug, and there are indications that it also helps prevent cardiovascular disease. Whether it slows the aging process itself in people without diabetes is the central question the ongoing TAME trial is trying to answer. Until those results are available, findings from cell and animal studies are interesting but not sufficient to give practical advice to healthy people. Gastrointestinal complaints and declining folate levels are side effects worth keeping in mind.
Multivitamins: a narrow benefit, not a miracle
Of all the classic supplements, the daily multivitamin has the most coherent evidence for one specific benefit: protecting memory in older age. A study of more than 11,000 participants found an effect equivalent to roughly three fewer years of memory decline. Independent confirmation is still needed, since the studies largely come from the same research program. For other aspects of healthy aging -- immune function, fall prevention, cardiovascular health -- supplementation is most useful when there is a demonstrable deficiency. Without a deficiency, the long-term effect is small and not convincingly established.
CoQ10: the formulation matters more than the brand name
Ubiquinol, the more active form of CoQ10, reaches the bloodstream two to three times more effectively than standard CoQ10 in small studies. But a high-quality ubiquinone softgel performed just as well as ubiquinol in a direct comparison. The quality of the formulation is at least as important as choosing the most expensive option. Large studies showing that ubiquinol outperforms other forms in treating an actual condition do not exist. Choose a quality softgel, regardless of what the label says.
Antioxidants: useful in specific cases, not as a general remedy
Antioxidant supplements are not a single category. Curcumin, preferably taken with piperine, and the combination of vitamin C and E in endometriosis have the strongest supporting evidence, though these remain preliminary results from small studies. As a broad anti-aging strategy, the evidence is too weak to justify the approach. If you have a specific condition for which a supplement has been studied, that is worth discussing with a doctor; outside of that, broad antioxidant supplementation lacks a solid foundation.
The pattern running through all of these compounds is consistent: the evidence is strongest where disease is already present, and thinnest when it comes to slowing aging in healthy people. That is not a reason to do nothing, but it is a reason to be precise about what you actually expect from whatever you are taking or considering starting.