Research on healthy aging keeps growing as Americans look for simple daily routines that may support long-term health. A new U.S. study now suggests one habit, taking a daily multivitamin, may be linked to slower biological aging over 2 years.
A 2-year trial found a measurable change
Researchers analyzing data from the COSMOS clinical trial reported that older adults who took a daily multivitamin for 2 years showed markers consistent with slower biological aging. The study looked at biological age measures rather than birthdays, and the reported difference amounted to roughly several months of aging slowdown over the trial period.
The work builds on COSMOS, a large U.S. randomized trial that previously tested multivitamins in thousands of adults. In this newer analysis, the key action was daily multivitamin use over a 2-year span, with researchers comparing participants who took the supplement against those who received a placebo.
The findings suggest the habit may affect aging at the cellular or molecular level, not just how people feel day to day. Still, the researchers stated that the study shows an association within a controlled trial and does not mean multivitamins can prevent disease or extend life on their own.
What the findings mean across the U.S.
The study was national in scope, not focused on one state or city, so there is no state-by-state breakdown of results. Researchers confirmed the participants were older U.S. adults, but a full list of local outcomes by state has not been released.
That means people in places like California, Texas, Florida, and New York should read the results as a broad national finding, not proof that the effect differs by region. The study does not identify whether diet, income, or access to health care in specific states changed the outcome.
It is also not yet clear whether younger adults would see the same results. The published analysis focused on the group included in the trial, and the researchers have not confirmed that the findings apply to children, teens, or all adults under age 60.
Why researchers say this matters now
Scientists have been paying closer attention to biological age because it may capture health changes earlier than standard disease diagnoses. In the COSMOS-related research, the idea is that a low-cost, daily supplement could influence nutrient pathways connected to aging, though the exact mechanism was not fully settled in the study.
That context matters because earlier COSMOS findings also linked daily multivitamin use with cognitive benefits in older adults. The new aging analysis adds another piece to the same research program, but it does not settle long-running debates over whether generally healthy adults need a multivitamin.
For consumers, the practical takeaway is narrow. The study suggests that a daily multivitamin may modestly slow biological aging in older U.S. adults over 2 years, and that is more limited than saying it slows aging for everyone. Researchers said more follow-up work is needed to confirm how durable the effect is over longer periods.
