New research suggests it might, particularly for older adults whose bodies are already aging faster than their actual age would suggest. A large clinical trial found that a standard daily multivitamin slowed certain biological aging markers over a two year period compared with a placebo, offering one of the more concrete findings yet on this question.
What is biological aging, and how is it different from your actual age
Biological age reflects the real physiological state of the body, shaped by genetics, lifestyle and environment, rather than simply counting years lived like chronological age does. Researchers note that living longer matters, but living better matters just as much, which is why measuring the body’s actual functional health has become a growing focus in aging research.
What was the study, and how was it conducted
The findings come from the COSMOS trial, short for Cocoa Supplement and Multivitamin Outcomes Study, published in Nature Medicine. Participants were randomly assigned to receive a daily multivitamin, cocoa extract, both, or a placebo over two years. The multivitamin used was a standard Centrum Silver formulation containing vitamins A, C, D3, E, K, B vitamins, along with minerals like magnesium and zinc. Researchers measured biological aging using epigenetic clocks, biomarkers that estimate a person’s biological age based on changes in their DNA.
What did the results actually show
The multivitamin group showed a measurable slowdown in two out of five epigenetic clocks tested compared with the placebo group, translating to a delay of roughly 2.7 to 5.1 months in biological aging over the two year study period. The benefit was most pronounced in participants who were already biologically older than their chronological age when the trial began. Not every epigenetic clock showed a significant effect, meaning the findings point to a promising but still partial picture rather than a definitive anti-aging solution.
Do experts think this means multivitamins actually extend healthy life
Not yet, and caution is warranted. One geriatric medicine specialist described the results as encouraging given how ambiguous multivitamin research has historically been for well nourished adults, calling this a high quality study offering a safe, accessible intervention. At the same time, the same expert stressed that slowing an epigenetic clock is not the same as proving someone will live longer or healthier as a result, and called for longer follow-up studies to connect these biological markers to real world outcomes.
Should multivitamins replace a healthy diet
No. Nutrition experts emphasize a food first approach, noting that multivitamins can help close nutrient gaps but cannot replicate the complex combination of nutrients found in whole foods. A daily supplement works best as an addition to, not a substitute for, a diet built around fruits, vegetables, whole grains and healthy fats.
How should someone choose a multivitamin if they want to try one
Registered dietitians recommend prioritizing quality and transparency over marketing claims. That means looking for brands that undergo third party testing for purity, avoiding products pushing megadoses of vitamins or unsubstantiated health claims, and selecting a formulation matched to your specific life stage, since nutrient needs shift meaningfully across different ages.
What does this mean going forward
The COSMOS trial adds real evidence to a previously murky area of nutrition science, suggesting daily multivitamin use may offer a modest, measurable benefit for biological aging in older adults. Researchers say the next step is determining whether these epigenetic changes translate into tangible improvements in long-term health, which will require further long-term studies to confirm.
