Multivitamins & Ageing: Study Shows Small Slowdown in Biological Age Markers

The daily multivitamin, a staple in many households, is once again under scrutiny – this time for a potentially positive effect. New research suggests that taking a multivitamin every day for two years may subtly slow down some markers of biological aging, though scientists are quick to emphasize the effect is modest and its real-world health implications remain unclear. The findings, published in Nature Medicine, add a nuanced layer to the ongoing debate about the benefits of dietary supplements.

Biological Age vs. Chronological Age: What’s the Difference?

It’s important to distinguish between how old we are and how old our bodies act. Chronological age is simply the number of years a person has lived. Biological age, however, reflects the actual state of the body’s cells and systems. Researchers increasingly believe that slowing the rate of biological aging could be key to preventing or delaying age-related illnesses, ultimately extending the period of good health. Estimating biological age often relies on analyzing changes in DNA methylation – modifications to DNA that accumulate over time and influence how genes function. These changes aren’t alterations to the DNA sequence itself, but rather affect how genes are expressed.

The study, led by Dr. Howard Sesso at Mass General Brigham, involved 958 healthy adults with an average age of 70. Participants were divided into groups receiving either a daily cocoa extract and multivitamin, cocoa extract and multivitamin placebo, cocoa extract placebo and multivitamin, or two placebos. Blood samples were collected at the beginning of the trial, and again after one and two years. Researchers then analyzed these samples using five different “epigenetic clocks” – tools that assess biological age based on DNA methylation patterns.

The results showed that those taking a daily multivitamin experienced a slowdown in biological aging, as measured by two of the five epigenetic clocks used in the study. Specifically, these clocks are designed to estimate mortality risk. Over the two-year period, the slowdown equated to roughly four months of less biological aging compared to the placebo group. Interestingly, the cocoa extract showed no effect on any of the epigenetic clocks and didn’t interact with the multivitamin’s impact.

Modest Effects, Greater Impact for Some?

While four months may seem tiny, researchers noted the effect was more pronounced in individuals who began the study with signs of accelerated biological aging – meaning their biological age was already higher than their chronological age. This suggests that people with greater nutritional deficits may benefit more from multivitamin supplementation. Dr. Sesso explained that nutritional status may play a role, but as well that the epigenetic clocks themselves could reflect other age-related risk factors. As reported in Nature Medicine, the team emphasized the require for further research to determine the clinical relevance of these findings.

It’s crucial to note that this study doesn’t definitively prove that multivitamins will lead to a longer or healthier life. It simply identifies a correlation between multivitamin use and changes in certain biological markers. Correlation does not equal causation. The study design, a randomized controlled trial, strengthens the evidence, but doesn’t eliminate the possibility of other factors influencing the results.

Contradictory Findings and Ongoing Debate

These findings arrive amidst a complex and sometimes contradictory body of research on multivitamin use. A large study published in 2024 actually found that daily multivitamins did not extend lifespan and might even be associated with a slightly increased risk of early death. The Guardian reported on this research, highlighting the ongoing uncertainty. However, Dr. Sesso and his colleagues point to previous work suggesting multivitamins may be linked to improved cognitive function, as well as reductions in lung cancer and cataracts. Research published in the journal Nutrients supports a potential link between multivitamin use and reduced cataract risk.

What Does This Mean for You?

Dr. Sesso is careful to state that the findings don’t mean everyone should rush out to buy a multivitamin. “You’ll see no known risks for taking a multivitamin in our two large clinical trials. At the same time, we do not know for sure who benefits, and how,” he said. Experts like Dr. Marco Di Antonio at Imperial College London emphasize that a healthy diet and lifestyle are far more important than relying on supplements. He suggests that any impact from multivitamins is likely to be minimal without a foundation of good health habits. Medical Xpress also reported on this perspective.

Pilar Guallar Castillón, an associate professor at the Autonomous University of Madrid, goes even further, advising people to stop taking multivitamins altogether and focus on a varied diet rich in fruits and vegetables. She points to the lack of robust clinical evidence supporting their widespread use and the significant commercial interests driving their sales.

Looking Ahead: Further Research and Clinical Relevance

The researchers acknowledge that further investigation is needed to determine whether the modest slowdown in biological aging observed in this study translates into meaningful clinical benefits. Future studies will need to explore whether multivitamin supplementation can reduce the risk of age-related diseases, improve quality of life, or extend lifespan. The team also plans to investigate which individuals are most likely to benefit from multivitamin use, potentially focusing on those with specific nutritional deficiencies or signs of accelerated biological aging. The focus now shifts to understanding the “clinical relevance” of these epigenetic changes – whether they truly reflect improvements in health and well-being.