How do daily multivitamins affect aging?
A modest slowing of biological "clock" markers
A randomized clinical trial of older adults found that taking a daily multivitamin for two years produced small but measurable changes on epigenetic "aging clocks" — laboratory tests that estimate biological age by measuring chemical marks on DNA. The trial compared people who took a standard multivitamin–multimineral supplement with those who did not and found that, on average, the supplement group showed slower progression on two commonly used epigenetic measures.
Why it matters
- The effect size was modest but consistent across the tested clocks and roughly equivalent to a few years of slower biological aging on those molecular scales.
- The slowing was greater in participants who were already biologically older at baseline, suggesting supplements may have different effects depending on an individual’s starting physiology.
What this does and does not show
The findings document a biochemical signal associated with supplementation, not proof that people will live longer or avoid age‑related disease. Epigenetic clocks are useful research tools that correlate with health and mortality risk, but changes on a clock do not guarantee clinical benefit. The trial also does not identify which specific vitamin or mineral — or combination — drove the signal, nor whether higher or lower doses would change the outcome.
Next steps for researchers and the public
- Researchers need longer follow-up and trials that track hard health outcomes such as disease incidence, function, and mortality.
- Trials that compare individual nutrients or different formulations could pinpoint active components.
- For individuals, the safest approach is to discuss supplementation with a clinician, since needs vary by diet, medications, and health conditions.
In short, daily multivitamins produced a small, reproducible shift on molecular markers of aging in this trial, a signal that merits further study but is not yet a clinical prescription for extending healthy lifespan.