Can a Daily Multivitamin Help You Age More Slowly?

Research Review · Estimated Reading Time: 4–5 minutes · Evidence-Based Health Insights from Mychael Seubert, ND

Every so often, a study comes along that challenges conventional thinking. A recently published study from the COcoa Supplement and Multivitamin Outcomes Study (COSMOS) did just that, suggesting that something as simple as a daily multivitamin may modestly slow biological aging.

That certainly caught my attention.

What the Study Found

Researchers followed older adults who took either Centrum Silver or a placebo for two years. Rather than simply looking at how participants felt, they measured biological age using advanced DNA methylation testing, often analyzed using “epigenetic clocks.” These tests estimate how quickly our cells are aging, which doesn’t always match our chronological age.

The results were encouraging.

Participants taking the multivitamin accumulated approximately four fewer months of biological aging over the two-year study than those taking the placebo.

Four months may not sound dramatic at first glance, but when you consider that it occurred over just two years, it becomes much more meaningful. While this doesn’t mean participants became younger or that aging was reversed, it does suggest their biological aging progressed more slowly.

This study also builds on earlier COSMOS research that found modest improvements in memory and cognitive function among participants taking a daily multivitamin. While these studies don’t prove that multivitamins prevent dementia or extend lifespan, they do suggest that maintaining adequate nutrition may play a larger role in healthy aging than many people realize.

Good nutrition matters. A multivitamin isn’t a substitute for eating well, moving your body, sleeping deeply, and managing stress — but consistently meeting your nutritional needs may be a meaningful piece of the healthy-aging picture. — Mychael Seubert, ND

Why Might This Matter?

Our bodies rely on dozens of vitamins and minerals every day to produce energy, repair cells, support the immune system, maintain healthy brain function, and regulate countless biochemical processes.

Unfortunately, many people don’t consistently obtain optimal amounts of every essential nutrient. As we age, absorption often declines, medication use increases, and nutritional needs can change. A multivitamin may help fill some of those nutritional gaps.

One of the things I appreciated most about this research was its design. Participants were randomly assigned to receive either a daily multivitamin or a placebo, and neither the participants nor the researchers knew who was taking which until the study was complete. This type of study design helps reduce bias and gives us greater confidence that the differences observed were due to the intervention itself rather than outside influences.

I also appreciated that the intervention was remarkably simple. Researchers weren’t testing an expensive anti-aging drug or an experimental therapy. They were evaluating something that millions of people already take every day.

Limitations Worth Noting

Like every study, however, this one has limitations.

Participants were followed for only two years, so we don’t know whether the benefits continue, increase, or eventually plateau over time. The researchers measured biological aging, not lifespan or the development of age-related diseases. In other words, we don’t yet know whether slowing biological aging by several months ultimately translates into living longer or healthier lives.

It’s also important to know that this analysis included approximately 958 participants from the much larger COSMOS trial because DNA methylation testing was performed only in this subgroup. Researchers also evaluated several different measures of biological aging, and while the overall findings were encouraging, not every epigenetic clock showed the same degree of benefit. Biological aging is complex, and no single test tells the entire story.

Finally, the researchers evaluated one specific multivitamin — Centrum Silver. The study cannot tell us whether other multivitamin formulations would produce the same — or perhaps even greater — results.

My Clinical Perspective

One of the biggest takeaways from this study is that good nutrition matters.

This research doesn’t suggest that a multivitamin is a substitute for eating well, exercising regularly, getting adequate sleep, or managing stress. Those lifestyle habits remain the foundation of healthy aging.

At the same time, this study raises another interesting question. If a daily multivitamin can provide measurable benefits on its own, what might happen when it’s combined with all the other pillars of healthy living — a nutrient-dense diet, regular physical activity, restorative sleep, stress management, maintaining a healthy weight, and avoiding smoking? We simply don’t know because the study wasn’t designed to answer that question.

My suspicion is that these healthy habits work together rather than independently. Health is rarely the result of one intervention. It’s usually the cumulative effect of many healthy choices made consistently over time. A multivitamin may be one important piece of that larger picture, but it is unlikely to be the entire picture.

A Note on Formulation

Another question that immediately came to mind was the formulation itself.

The researchers used Centrum Silver, a commonly available over-the-counter multivitamin. While it demonstrated measurable benefits in this study, it contains several nutrient forms that differ from those commonly found in many professional-quality supplements. For example, many practitioner-grade multivitamins use methylfolate instead of folic acid, methylcobalamin instead of cyanocobalamin, more bioavailable mineral forms instead of mineral oxides, and natural mixed tocopherols rather than isolated synthetic vitamin E.

One thing I’d like readers to understand is that this study tested a product — not a concept.

It demonstrated that one specific multivitamin, Centrum Silver, produced measurable benefits in older adults over two years. It did not answer whether all multivitamins produce the same results, whether some formulations are superior, or whether more bioavailable nutrient forms would lead to greater benefits. Those are entirely different questions, and they remain unanswered.

Does that mean a professional-grade multivitamin would perform better? We simply don’t know because this study wasn’t designed to compare formulations. That’s not a criticism of the study — it’s an opportunity for future research.

That’s one of the reasons I enjoy reading studies like this. Good research often answers one important question while raising several others.

As a naturopathic doctor, I’ve long believed that nutrition influences how well we age — not just how long we live. This study provides encouraging evidence supporting that concept and reinforces something I discuss with patients every day: consistently meeting your nutritional needs matters.

If you’d like a personalized review of your supplement routine, our team is happy to help — explore our services or book a consultation.

Reference

Li, S., Hamaya, R., Zhu, H. et al. Effects of daily multivitamin–multimineral and cocoa extract supplementation on epigenetic aging clocks in the COSMOS randomized clinical trial. Nat Med (2026). Source

This article is intended for educational purposes only and should not be considered medical advice. Always consult your healthcare provider before making changes to your diet, supplements, or medical care.