Updated 25/05/2026
A groundbreaking study published in Nature Medicine has found that daily multivitamin supplementation can slow biological aging processes and significantly delay cognitive decline. The research, led by Li et al., tracked participants over two years and represents one of the largest controlled trials examining multivitamins’ effects on aging biomarkers.
Multivitamin Effects on Aging Biomarkers
Epigenetic aging clocks affected by daily supplementation over 2 years
Source: Li et al., Nature Medicine, 2026 | Georgian Medical Journal News
Epigenetic Aging Clocks Show Measurable Changes
The Nature Medicine study by Li et al. examined five different epigenetic aging clocks, sophisticated biomarkers that measure biological age at the cellular level. The researchers found that daily multivitamin supplementation significantly slowed two of these five aging clocks over the two-year study period.
According to Li et al.’s findings published in Nature Medicine (2026), the strongest effects were observed in participants who were aging faster at baseline, suggesting that multivitamins may be particularly beneficial for individuals with accelerated biological aging. This finding aligns with growing evidence that nutritional interventions can influence fundamental aging processes.
Cognitive Benefits Emerge Across Large Trial Population
The more significant findings came from the broader COSMOS (COcoa Supplement and Multivitamin Outcomes Study) trial, which according to Li et al. included 5,203 participants across three substudies. The study found that participants taking daily multivitamins showed cognitive aging delays equivalent to approximately two years compared to those receiving placebo.
According to the Nature Medicine study by Li et al., this cognitive protection was consistent across multiple domains of brain function, including memory, executive function, and processing speed.
Implications for Healthy Aging Research
The study’s dual findings on both biological and cognitive aging markers represent a significant advancement in aging research. The Li et al. research demonstrates that nutritional supplementation may influence multiple aging pathways simultaneously.
Li et al. emphasized in their Nature Medicine publication that while the results are promising, they reflect population-level effects rather than guaranteed individual benefits. The research contributes to growing evidence that simple, accessible interventions may help maintain health span in aging populations.
Daily multivitamin supplementation delayed cognitive aging by approximately 2 years and slowed 40% of measured epigenetic aging clocks over a 2-year period in a randomized controlled trial.
— Li et al., Nature Medicine, 2026
Key takeaways
- Multivitamins slowed 2 of 5 epigenetic aging clocks in a controlled 2-year study (Li et al., Nature Medicine, 2026)
- Cognitive aging was delayed by ~2 years across 5,203 COSMOS trial participants (Li et al., Nature Medicine, 2026)
- Strongest effects seen in individuals with faster baseline aging rates (Li et al., Nature Medicine, 2026)
- Results suggest accessible interventions may influence multiple aging pathways
Frequently asked questions
What are epigenetic aging clocks?
Epigenetic aging clocks are sophisticated biomarkers that measure biological age by analyzing DNA methylation patterns. They can indicate how fast someone is aging at the cellular level, independent of chronological age.
How significant is a 2-year delay in cognitive aging?
A 2-year delay in cognitive aging represents a clinically meaningful benefit, potentially helping maintain independence and quality of life longer.
Should everyone take multivitamins based on these results?
While promising, these results represent population-level effects and individual responses may vary. Consult with healthcare providers about whether multivitamin supplementation is appropriate for your specific health circumstances and dietary needs.
The convergence of biological and cognitive aging benefits in this large-scale study by Li et al. provides compelling evidence that nutritional interventions may play a meaningful role in healthy aging strategies. As researchers continue to investigate the mechanisms behind these effects, the findings offer hope for accessible approaches to maintaining health span in an aging global population.
Source: Li et al., Nature Medicine, 2026 – Daily multivitamin effects on epigenetic aging clocks
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Medically reviewed by Prof. Giorgi Pkhakadze, MD, MPH, PhD. Spotted an error? Contact the editorial team.
