Should You Take a Multivitamin? A Harvard Researcher’s Verdict | Dr Howard Sesso & Dr Li Sidong
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Dr. Howard Sesso of Harvard explains the results of the COSMOS trial, identifying who actually benefits from a daily multivitamin and how it impacts biological aging.
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Is a daily multivitamin a life-extending "insurance policy" or just a waste of money? In this clip, Dr. Howard Sesso, Co-Principal Investigator of the landmark COSMOS trial, breaks down the clinical evidence from over 21,000 participants. We explore the "sweet spot" of nutritional insufficiency; where you aren't clinically deficient but lack the levels needed for optimal healthspan.
Dr. Sesso and Dr. Sidong Li discuss how multivitamins specifically slowed the "epigenetic clock" in individuals with existing risk factors like hypertension and accelerated biological aging. We also cover the importance of "precision nutrition" and why the synergy of essential vitamins and minerals may be more effective than high-dose single supplements. If you’re looking for a common-sense, evidence-based approach to basic supplementation, this deep dive into the Harvard-led COSMOS data provides the answers you need.
📚 Chapters
0:00 The "Insurance Policy" Strategy for Supplements
0:55 Is a Multivitamin a Waste of Money?
1:57 Who Benefits Most? (Sub-Analysis Results)
4:04 The Impact of Hypertension & Health Risks
6:25 Nutritional Insufficiency vs. Overt Deficiency
8:36 Evidence: Do Biomarkers Actually Change?
🌐Links in this video
COSMOS Trial home page https://cosmostrial.org/
Effects of daily multivitamin–multimineral and cocoa extract supplementation on epigenetic aging clocks in the COSMOS randomized clinical trial
https://www.nature.com/articles/s41591-026-04239-3
#EpigeneticAging #Multivitamins #BiologicalAge
Modern Healthspan · 10 min · Source published: 2026-04-19
Added to Harbor: 10/23/2026
Original on YouTube ↗Automatically categorized source. Creator statements are not an independent evidence review or personal medical guidance.