Modern Healthspan

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.
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.

🌐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

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Senescent cells — cells that have stopped dividing but refuse to die — accumulate with age and are increasingly recognised as a key driver of age-related disease. Most people in the longevity space are familiar with senolytics like dasatinib and quercetin, but a potentially more precise approach is emerging: harnessing the immune system itself to find and eliminate senescent cells.
Dr. Amit Sharma leads the senescence immunology group at the Lifespan Research Institute, where his lab studies how natural killer cells and gamma delta T cells interact with senescent cells — and how that relationship breaks down with age. In this conversation, we explore the biology of immune surveillance of senescence, why it fails as we get older, and what his lab is doing to restore and enhance it. We also discuss the iron-ferroptosis connection, next-generation senolytics, and what the next decade might bring for senotherapy.

🌐Links in this video
Lifespan Research Institute: https://lifespanresearchinstitute.io
Dr Sharma's lab page https://lifespan.io/our-research/sharma-lab/
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Longevity researcher Nir Barzilai on what centenarians reveal about aging and the four drugs scientists believe may target it directly.
Dr Nir Barzilai has spent decades studying people who live to 100 and beyond. What he's found challenges many assumptions about aging, disease, and what we can actually do about them. In this conversation we cover what centenarian research really shows, including why they get the same diseases as the rest of us, just decades later, and what that means for the goal of longevity medicine. We then move into the practical territory: what criteria distinguish a drug that treats one disease from one that may target aging itself, which four currently approved drugs score highest on that framework, and how leading longevity physicians are beginning to use them in practice. We also discuss GLP-1 agonists in depth; their mechanisms, the emerging evidence for benefits well beyond weight loss, and the important caveats around muscle loss. Essential viewing for anyone following the science of healthy aging.

🌐Links in this video
Dr Barzilai at Albert Einstein College of Medicine https://einsteinmed.edu/faculty/484/nir-barzilai Healthy Longevity Medicine Society https://hlms.co/ American Federation for Aging Research https://www.afar.org/ Academy for Health & Lifespan Research https://www.ahlresearch.org/

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GLP-1 drugs likesemaglutide and ozempic have become household names but how much do we reallyunderstand about what they're doing inside the body? In this episode I sit downwith Dr. Mikhail Kolonin, Professor and Director of the Center for Metabolicand Degenerative Diseases at UTHealth Houston's McGovern Medical School, whoselab has spent years uncovering the deeper biology of these drugs.
We go far beyondweight loss. Dr. Kolonin explains how GLP-1 drugs trigger IL-6 signaling in fattissue, activating a thermogenic program that converts metabolically inactivewhite fat into energy-burning brown fat and how in some patients this isaccompanied by upregulation of telomerase, a protein with profound implicationsfor mitochondrial health and aging. We also tackle the muscle loss questiondirectly, examining what the latest research reveals about why lean mass losson GLP-1s exceeds simple caloric restriction, and what can realistically bedone about it.
 
🌐Linksin this video Dr Kolonin's page https://gsbs.uth.edu/directory/profile?id=b816c8de-c9b0-40f0-873c-42fa69db82e9
 
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Dr. Anurag Singh, Chief Scientific Officer at Timeline Nutrition joins Modern Healthspan for an in-depth conversation about urolithin A and the science of mitophagy, the cellular process that cleans out damaged mitochondria.
We explore the clinical evidence from multiple human trials: the ATLAS trial showing 12% muscle strength gains and 10% VO2 max improvements in sedentary middle-aged adults, independent studies in elite athletes demonstrating enhanced recovery and performance, and the groundbreaking MitoImmune trial published in Nature Aging revealing 20% increases in immune cell mitochondria in just 28 days.
Dr. Singh provides practical guidance on dosing (500mg vs 1000mg), timing, and who benefits most from supplementation. We discuss why only 30% of people can produce urolithin A naturally from foods like pomegranates and berries, and how direct supplementation overcomes this limitation.
Looking ahead, we cover Timeline's Healthspan XPrize semi-finalist status, ongoing blood-brain barrier research setting the stage for brain health trials, and Dr. Singh's vision for combining mitophagy activation with emerging therapies like mitochondrial transplantation. He also shares why he believes mitochondrial dysfunction is "the mother of all hallmarks of aging."
Whether you're interested in the science of healthy aging, considering urolithin A supplementation, or want to understand the future of longevity medicine, this comprehensive conversation provides the evidence and insights you need.
Topics covered:
• What urolithin A is and how mitophagy works
• ATLAS trial results: muscle, endurance, and inflammation
• MitoImmune trial: immune system rejuvenation
• Practical supplementation guide
• Brain health research and future directions
• The role of mitochondrial health in aging

🌐Links in this video
Time-Line home page https://www.timeline.com/ ATLAS Trial: Urolithin A improves muscle strength, exercise performance, and biomarkers of mitochondrial health in a randomized trial in middle-aged adults https://pubmed.ncbi.nlm.nih.gov/35584623/ Effect of the mitophagy inducer urolithin A on age-related immune decline: a randomized, placebo-controlled trial https://www.nature.com/articles/s43587-025-00996-x

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If you would like to support our channel please consider signing up on patreon https://patreon.com/ModernHealthspan
You can also find us on YouTube at https://www.youtube.com/c/modernhealthspan