How a Daily Multivitamin Affected Cognition and Epigenetic Aging
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A standard multivitamin can help fill micronutrient gaps when diet does not consistently provide enough vitamins and minerals. In this clip from Dr. Steve Horvath's FoundMyFitness interview with Dr. Rhonda Patrick, they discuss three cognitive substudies within the COSMOS trial program. The pooled analysis found small advantages in global cognition and episodic memory among older adults assigned to a daily Centrum Silver multivitamin. Investigators compared the global-cognition difference with approximately two years of typical age-related cognitive change, providing a useful way to describe the effect size measured on cognitive tests. [1]
A separate two-year COSMOS analysis examined five blood DNA-methylation clocks. The multivitamin produced modest favorable changes in PCPhenoAge and PCGrimAge, equivalent arithmetically to about five months and 2.7 months over two years. The other three clocks did not change significantly. These results show that selected methylation measures can detect a small response to a nutritional intervention, while the cognitive tests and methylation clocks remain distinct outcomes. [2]
Dr. Patrick and Dr. Horvath frame these findings as useful evidence for an individualized decision rather than a substitute for a varied diet. Earlier long-term research in older male physicians found no cognitive benefit, and the main COSMOS trial did not significantly reduce invasive cancer, cardiovascular events, or mortality over a median of 3.6 years. Formula and personal context also matter because vitamin K, iron, fat-soluble vitamins, and other nutrients can interact with medicines or become excessive when supplements are stacked. [3] [4]
- ^ Vyas, Chirag M; Manson, JoAnn E; Sesso, Howard D; Cook, Nancy R; Rist, Pamela M; Weinberg, Alison, et al. (2024). Effect Of Multivitamin-Mineral Supplementation Versus Placebo On Cognitive Function: Results From The Clinic Subcohort Of The COcoa Supplement And Multivitamin Outcomes Study (COSMOS) Randomized Clinical Trial And Meta-Analysis Of 3 Cognitive Studies Within COSMOS The American Journal Of Clinical Nutrition , .
- ^ (2026). Effects of daily multivitamin–multimineral and cocoa extract supplementation on epigenetic aging clocks in the COSMOS randomized clinical trial Nature Medicine 32, .
- ^ 10.7326/0003-4819-159-12-201312170-00006
- ^ Sesso, Howard D; Rist, Pamela M; Aragaki, Aaron K; Rautiainen, Susanne; Johnson, Lisa G; Friedenberg, Georgina, et al. (2022). Multivitamins In The Prevention Of Cancer And Cardiovascular Disease: The COcoa Supplement And Multivitamin Outcomes Study (COSMOS) Randomized Clinical Trial The American Journal Of Clinical Nutrition 115, 6.
Dr. Rhonda Patrick: Let us discuss the multivitamin results from COSMOS. Three cognitive substudies within the larger COSMOS program assessed older adults who received a daily Centrum Silver multivitamin or placebo.
Across the pooled cognitive analyses, the multivitamin group had a small advantage in global cognition and episodic memory. Investigators translated the global-cognition effect into approximately two years of age-related cognitive change. One episodic-memory comparison was translated into about 4.8 years. These are model-based comparisons of test-score trajectories, not literal measurements of brain age, MRI changes, dementia prevention, or added years of life.
The result is encouraging because a standard multivitamin can help fill some dietary gaps. It does not supply meaningful essential fatty acids, protein, fiber, or the complete food matrix, and the trial does not show that every older adult has the same nutrient gap.
A separate COSMOS ancillary analysis examined five blood DNA-methylation clocks over two years. It found statistically significant differences for PCPhenoAge and PCGrimAge, equivalent arithmetically to about five and 2.7 months over two years. The other three clocks did not change significantly. These biomarkers were separate from the cognitive outcomes.
Dr. Steve Horvath: The clock effects were small. A person should not hear “three months” and think a multivitamin reversed decades of age.
Dr. Rhonda Patrick: Could a small two-year effect accumulate over 20 to 40 years?
Dr. Steve Horvath: It might, but that is an expectation, not a tested result. We do not know whether the effect persists, plateaus, changes with nutrient status, or translates into clinical outcomes.
Dr. Rhonda Patrick: The intervention requires little effort, so even a modest benefit can be interesting. However, the cognitive “years” and methylation-clock “months” measure different endpoints and should not be combined into one anti-aging estimate.
The main COSMOS trial also examined cancer and cardiovascular outcomes. It did not find statistically significant reductions in invasive cancer, cardiovascular events, or mortality over a median of 3.6 years.
Dr. Steve Horvath: I view the methylation result as evidence that some clocks can detect a small intervention signal. Hard outcomes such as mortality are definitive but can require much larger samples and longer follow-up. A biomarker change does not overrule a randomized null clinical outcome or prove that the clock is a validated surrogate for longevity.
Earlier multivitamin evidence is mixed. A long-term Physicians' Health Study II cognitive analysis in older male physicians did not find a benefit. COSMOS provides a newer small signal from one trial program, not three fully independent replications.
Dr. Rhonda Patrick: A standard-dose multivitamin may be useful as nutritional insurance for some people, especially when diet leaves gaps. It should not replace a varied diet or indicated treatment.
Safety also depends on the formula and the person. Vitamin K can interact with warfarin. Iron, vitamin A, vitamin D, vitamin B6, zinc, selenium, and other nutrients can become excessive when products are stacked. Kidney or liver disease, pregnancy, smoking history, and medications can change what is appropriate.
Dr. Steve Horvath: The new results can inform an individual decision, but they do not make a multivitamin non-negotiable for everyone over 65.
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