A new large-scale clinical trial suggests that taking a daily multivitamin may help slow biological aging, offering a potential strategy to support healthier aging in older adults. The findings come from the COSMOS (COcoa Supplement Multivitamin Outcomes Study) and were recently published in Nature Medicine.
While the results are promising, researchers emphasize that multivitamins should complement — not replace — healthy lifestyle habits such as balanced nutrition, exercise, and quality sleep.
Understanding Biological Aging
Biological aging refers to the actual aging process occurring in the body’s cells and tissues, which may differ from a person’s chronological age. Scientists measure biological aging using biomarkers such as epigenetic clocks, which analyze DNA methylation patterns to estimate how quickly the body is aging.
Lifestyle factors like diet, physical activity, sleep quality, and avoiding smoking have already been shown to influence biological aging.
The COSMOS Clinical Trial
The new findings are based on data from the COSMOS trial, a large randomized clinical study investigating the effects of dietary supplements on health.
For this analysis, researchers studied 958 participants from the trial, with an average age of around 70 years.
Participants were randomly assigned to take one of the following daily combinations over two years:
- A multivitamin and cocoa extract
- A multivitamin and placebo
- Cocoa extract and placebo
- Two placebos
The multivitamin used in the trial contained essential nutrients such as vitamins A, C, D, E, K, B vitamins, magnesium, calcium, and zinc.
Key Findings
After two years, researchers discovered that participants taking a daily multivitamin experienced slower biological aging compared with those taking a placebo.
Two specific epigenetic aging markers — PCGrimAge and PCPhenoAge — showed measurable improvement.
Overall, the results suggested that multivitamin supplementation slowed biological aging by approximately 2.7 to 5.1 months over a two-year period.
Although aging continued in all participants, it progressed more slowly in the multivitamin group.
Who Benefited the Most?
Interestingly, the study found that participants who were biologically older than their chronological age at the start of the trial experienced the greatest benefits.
This suggests that individuals experiencing accelerated aging due to factors like poor diet, chronic conditions, or lifestyle stress may benefit more from nutritional support.
Why More Research Is Needed
Despite the encouraging findings, experts caution that this area of research is still developing.
Scientists still need to determine:
- Whether slowing epigenetic aging actually leads to longer or healthier lives
- Which specific vitamins or nutrients contribute most to the effect
- Whether similar results appear in diverse populations
Future studies will explore additional epigenetic markers and evaluate long-term health outcomes.
Supplements vs. Nutrition: The “Food First” Approach
Health experts emphasize that whole foods remain the best source of essential nutrients.
While multivitamins can help fill nutritional gaps, they cannot replicate the complex combination of fiber, antioxidants, and bioactive compounds found in real foods.
Key nutrients linked to healthy aging can be obtained from foods such as:
- Leafy greens, legumes, and whole grains (B vitamins)
- Citrus fruits and berries (vitamin C)
- Fatty fish and fortified foods (vitamin D)
- Nuts and seeds (vitamin E)
- Beans and vegetables (magnesium)
Experts recommend prioritizing a balanced diet, regular physical activity, and healthy sleep patterns as the foundation of long-term wellness.
The Future of Healthy Aging Research
As scientists continue exploring ways to extend not just lifespan but healthspan, nutritional interventions like multivitamins may become part of a broader strategy for supporting healthy aging.
However, researchers agree that maintaining healthy lifestyle habits and balanced nutrition remains the most reliable approach to slowing the aging process and promoting long-term health.
