Randomized trial shows daily multivitamin may slow biological ageing in older adults — Evidence Review
Published in Nature Medicine, by researchers from Mass General Brigham, Mars
Researched by
— the AI search engine for science
Table of Contents
Taking a daily multivitamin for two years slowed some markers of biological aging by about four months, according to a new randomized trial in older adults. Related studies show mixed results: some report modest benefits of multivitamins or specific nutrients on aging biomarkers, while others find little to no impact on clinical outcomes or longevity, highlighting ongoing uncertainty (Mass General Brigham).
- The new trial’s finding of slowed epigenetic aging aligns with evidence that certain micronutrients and antioxidant-rich foods may support healthy aging, but other large trials and meta-analyses have not found consistent reductions in mortality or major disease risk from multivitamin use 1 3 12.
- Some studies suggest multivitamin users have longer telomeres or improved blood biomarkers, yet these biological changes have not reliably translated into longer life or lower rates of age-related diseases 1 7 12.
- There is evidence that multivitamin and multimineral supplements may benefit individuals with nutritional deficiencies or accelerated biological aging, but healthy, well-nourished populations appear to gain little clinical advantage 5 6 8.
Study Overview and Key Findings
Understanding whether a daily multivitamin can slow the biological processes of aging is of growing interest, as people live longer and seek strategies to maintain health into older age. The recent randomized controlled trial led by researchers at Mass General Brigham and funded in part by Mars, Inc., is notable for its use of epigenetic clocks—biomarkers based on DNA methylation patterns—to assess biological aging, rather than relying solely on clinical outcomes or self-reported health. This approach provides a nuanced look at how nutritional interventions may influence underlying molecular changes associated with aging, though the clinical significance of such changes remains unclear.
| Property | Value |
|---|---|
| Organization | Mass General Brigham, Mars |
| Journal Name | Nature Medicine |
| Authors | Dr Howard Sesso, Sasso and colleagues |
| Population | Healthy older adults |
| Sample Size | n=958 |
| Methods | Randomized Controlled Trial (RCT) |
| Outcome | Biological ageing markers, mortality risk estimates |
| Results | Daily multivitamin slowed biological ageing by about four months. |
Literature Review: Related Studies
To place this new study in context, we searched the Consensus database of over 200 million research papers using the following queries:
- multivitamin effects biological ageing
- daily multivitamin aging biomarkers
- long-term multivitamin health outcomes
Below, we summarize key topics and findings from related studies:
| Topic | Key Findings |
|---|---|
| How do multivitamins and micronutrients affect biological aging? | - Multivitamin use is associated with longer telomeres, an indicator of cellular aging, especially in women 1. - Combinations of nutrients (e.g., omega-3, vitamin D, antioxidants) show small, additive protective effects on epigenetic aging clocks, particularly in those with accelerated biological aging 2 5. |
| Do multivitamins improve clinical health outcomes in older adults? | - Most large RCTs and meta-analyses report no significant reduction in all-cause mortality, cardiovascular events, or cognitive decline from multivitamin use in well-nourished populations 6 10 12 13. - Some recent trials show modest improvements in memory or blood biomarkers, but not in overall cognitive or disease outcomes 7 9. |
| Are benefits greater for those with deficiencies or higher biological risk? | - Multivitamins and multi-nutrient supplements may benefit those with nutritional inadequacies or accelerated biological aging, reducing epigenetic age and inflammation markers in these subgroups 5 8. - Well-nourished individuals or those with normal aging markers often show little to no benefit from supplementation 6 8. |
| What is the role of diet and lifestyle compared to supplements? | - Dietary patterns rich in antioxidants and micronutrients are linked to healthier aging, but evidence for supplements alone as effective anti-aging agents remains limited 3 4. - Optimal nutrient intakes depend on complex interactions; supplements cannot substitute for an overall healthy lifestyle 3 4. |
How do multivitamins and micronutrients affect biological aging?
The new study’s focus on epigenetic clocks is echoed in earlier research examining molecular markers of aging, such as telomere length and DNA methylation. Observational studies indicate that regular multivitamin use may be associated with longer telomeres, while experimental trials suggest that combinations of nutrients can slightly slow measures of biological aging, particularly in individuals with accelerated aging at baseline. However, these effects are generally modest and their clinical implications remain uncertain.
- Multivitamin use correlated with longer telomeres in women, suggesting possible slowing of cellular aging 1.
- Omega-3, vitamin D, and exercise together slowed biological aging as measured by DNA methylation clocks, with effects ranging from 2.9-3.8 months over three years 2.
- Multi-component supplements reduced epigenetic age and inflammation in older adults with accelerated biological aging, but not in the general older adult population 5.
- The magnitude of biological age slowing in the new study (about four months over two years) is consistent with these modest effects 2 5.
Do multivitamins improve clinical health outcomes in older adults?
Despite some positive changes in biological markers, large randomized trials and meta-analyses have not consistently found that multivitamin supplementation improves major clinical outcomes such as mortality, cardiovascular events, or cognitive decline in generally healthy older adults. Some recent studies do report improvements in specific cognitive domains or blood biomarkers, but these have not translated to broader health benefits.
- Long-term multivitamin supplementation did not reduce all-cause mortality, cardiovascular disease, or cognitive decline in large RCTs and meta-analyses 6 10 12 13.
- Some smaller or shorter-term trials found improvements in memory and certain blood biomarkers, but not in overall cognition or disease outcomes 7 9.
- The lack of clear clinical benefit may reflect the relatively well-nourished status of study populations or insufficient supplement dosages 6 12.
- The new study similarly did not demonstrate direct clinical benefits, only modest changes in aging biomarkers.
Are benefits greater for those with deficiencies or higher biological risk?
There is evidence that supplementation may be more effective in individuals with nutritional inadequacies or accelerated biological aging. In these subgroups, combined multinutrient supplements have shown reductions in biological age markers and inflammation, while well-nourished or normal-aging individuals derive little benefit.
- Multivitamin supplementation improved nutrient intakes and decreased deficiencies among middle-aged and older adults in the U.S., with potential health implications for those with inadequate diets 8.
- A targeted multi-component supplement reduced epigenetic age and inflammation specifically in older adults with accelerated aging or higher inflammatory markers 5.
- The new study found larger effects in participants with faster biological aging at baseline, supporting the idea of greater benefit in higher-risk subgroups 5.
- These findings highlight the importance of personalized approaches, as population-wide supplementation may not be universally effective 5 8.
What is the role of diet and lifestyle compared to supplements?
Reviews emphasize that while micronutrients are essential to health, obtaining them through a balanced, antioxidant-rich diet is preferable to relying on supplements alone. The complexity of nutrient interactions and individual variation in needs means that supplements are unlikely to substitute for a healthy lifestyle.
- Antioxidant-rich foods may help restore oxidative balance and support healthy aging, but evidence supporting supplements as anti-aging agents remains limited 3.
- Optimal nutrient intakes for aging are highly individualized, depending on multiple dietary and metabolic factors; intermediate intake levels often perform best 4.
- Supplementation may be most useful for those unable to achieve adequate nutrient intake through diet 3 4.
- The new study’s authors and independent experts caution that multivitamins are not a replacement for healthy eating and lifestyle 3 4.
Future Research Questions
While this study adds to the growing literature on nutritional interventions and biological aging, further research is needed to clarify whether modest changes in aging biomarkers lead to tangible health benefits, and to determine which populations may benefit most from supplementation. Unanswered questions remain about the optimal composition, dosage, and duration of supplementation, as well as the interplay between diet, lifestyle, and supplements.
| Research Question | Relevance |
|---|---|
| Does slowing epigenetic aging with multivitamins translate into measurable clinical health benefits? | It is unclear if small changes in epigenetic clocks from multivitamin use lead to better health or longer life; most large RCTs have not shown reductions in mortality or major diseases 6 10 12. |
| Which populations benefit most from multivitamin supplementation in terms of biological aging? | Evidence suggests greater benefit for individuals with accelerated biological aging or nutritional deficiencies, but less effect in well-nourished adults 5 8. Identifying at-risk groups could improve targeting and effectiveness of interventions. |
| What is the optimal composition and dosage of multivitamin supplements to affect aging biomarkers? | Most studies use commercially available multivitamins, but the ideal mix and dose for slowing biological aging is unknown; nutrient interactions are complex and may require personalization 4 5. |
| How do dietary patterns and lifestyle factors interact with supplement use in influencing biological aging? | Healthy diets and lifestyles may modify or outweigh the effects of supplementation; understanding interactions is crucial for developing effective aging interventions 3 4. |
| Are there long-term risks associated with chronic multivitamin use in older adults? | While no major harms have been detected in most studies, some analyses suggest possible risks of excess intake for certain nutrients; ongoing safety evaluation is important, especially for high-dose or prolonged use 12 8. |