Can this daily supplement really slow down the passage of time?

One capsule a day to ward off aging?

Millions of people take a multivitamin every morning—a simple habit fueled by the hope of maintaining their health as the years go by. Yet scientifically proving the effectiveness of this habit has always been a challenge for science. A new piece has just been added to the puzzle—and it’s a significant one.

Researchers at Mass General Brigham, a U.S. healthcare and research network, report evidence suggesting that this common dietary supplement may influence biological aging itself. In a clinical trial involving older adults, participants who took a daily multivitamin showed a subtle slowing of certain “epigenetic clocks.”

These markers, measured in the blood, estimate the rate at which our bodies age. Over a two-year period, the observed difference translated to biological aging that was approximately four months slower compared to the group receiving a placebo. These results do not suggest that vitamins stop time, but they offer a rare indication: a simple supplement could steer the body’s internal aging processes in a more favorable direction.

Scientists Examine the Body’s Internal Clock

To reach this conclusion, the study relied on cutting-edge tools known as epigenetic clocks. These are blood tests that scientists use to assess the rate at which an organism ages, regardless of its chronological age. How do they work?

These clocks analyze tiny chemical tags attached to our DNA. Over time, due to stress and cellular damage, these tags can change, thereby altering how our genes behave. Some newer versions of these tools go even beyond simply estimating biological age.

They are designed to track disease risks and survival outcomes. That’s why even small variations in the rhythm of these clocks catch researchers’ attention—especially when the treatment being tested is as common and accessible as a daily multivitamin.

At the Heart of the COSMOS Study

The research was conducted as part of a larger study, the “Cocoa Supplement and Multivitamin Outcomes Study” (COSMOS). For this specific component, scientists followed 958 healthy adults, whose average age was about 70. The methodology was rigorous to ensure the reliability of the results.

Participants were randomly assigned to four distinct groups. This random assignment allowed researchers to distinguish the effects of a daily multivitamin from those of a cocoa extract, which was also tested. Over the course of the two-year study, the volunteers provided blood samples on several occasions.

This approach allowed researchers to track changes in markers of aging over time, rather than relying on a single point-in-time measurement. Thanks to this design, the multivitamin was tested under much more controlled conditions than would be possible by observing typical consumption habits.

A Modest but Targeted Slowdown

By the second year of the study, the five epigenetic clocks measured were shifting slightly in the same favorable direction. However, two of them showed a change large enough to be considered statistically significant. The fact that these two clocks are closely linked to the risk of death from age-related diseases made this change all the more relevant.

Over the entire two-year period, the difference accumulated to approximately four fewer months of biological aging in the multivitamin group compared to the placebo group. It is crucial to note that the participants did not become biologically younger, and the study does not claim that the vitamin prolongs life.

Interestingly, it was the participants whose bodies already appeared older than their actual age who benefited most from the multivitamin. In this group, the most pronounced changes were observed in these same measures, suggesting that the supplement was effective where aging was most rapid. An analysis of a smaller subgroup also showed that low nutrient levels were correlated with faster aging, suggesting that addressing even mild nutritional deficiencies could reduce cellular wear and tear. This idea, however, still requires stronger evidence and only partially explains why the benefits were not uniform.

Mixed Results and Unanswered Questions

Meanwhile, the group testing the cocoa extract showed no convincing slowing of aging on any of the five biological clocks. This contrast is significant, as both supplements were evaluated in the same trial, with the same statistical background noise. One possible interpretation is that different treatments may act on different aspects of aging, and that these blood markers capture only a portion of them. The multivitamin’s result therefore appears to be more specific than a general claim about supplements.

Other components of the COSMOS research program had already shown potential benefits for the multivitamin. A previous analysis had revealed improvements in overall cognitive function, memory, and organizational skills after three years of daily use. However, the main trial did not find a reduction in the total number of cancers or cardiovascular diseases, although lung cancer occurred less frequently in the supplementation group.

These mixed results suggest that while the supplement may have some benefits, the overall picture remains uncertain. Changes in aging biomarkers were modest, and three of the five markers did not reach statistical significance. Furthermore, the study population was limited: most participants were white, and all were older adults. The results may therefore not apply to younger or more diverse populations. Another recent study, in fact, found similar changes with omega-3 supplements, suggesting that this type of modest change may be common.

What’s Next? Looking to the Future

“There is a lot of interest today in identifying ways not only to live longer, but to live better,” said Dr. Howard Sesso, the study’s lead author. The researchers now hope to verify whether the slowing of the biological clocks persists after the trial ends. They also plan to determine whether these changes in the blood can explain the observed benefits for memory or the reduced risk of certain diseases.

“Many people take a multivitamin without necessarily knowing its benefits, so the more we can learn about its potential health benefits, the better,” added Dr. Sesso. This next step is crucial, because people don’t take vitamins to improve a lab score, but to age well.

For now, the results of the study published in the journal Nature Medicine suggest that this inexpensive and familiar capsule does not stop aging. It may, however, shift two well-established blood markers in a slightly younger direction. This discovery seems less like a miracle cure and more like a serious lead worth exploring further.

Source: earth.com

Can this daily supplement really slow down the passage of time?