Full show notes: https://bengreenfieldlife.com/timelinereplay In this special replay episode with repeat guest Dr. Anurag Singh from Timeline Nutrition, you'll explore the science of cellular health and longevity, including why mitochondrial function affects everything from energy and muscle performance to cognitive clarity and how well you age. Dr. Singh explains how urolithin A, a postbiotic compound derived from foods like pomegranates and berries, activates mitophagy, the body's cellular clean-up system that clears out worn-out mitochondria and replaces them with new ones, and how clinical research shows it can support muscle strength, endurance, immune resilience, and cognitive function. You'll also hear how diet, gut health, exercise, sleep, and recovery work alongside urolithin A to build a stronger, more resilient physiology over time. Dr. Anurag Singh is Chief Medical Officer at Timeline Nutrition, with an M.D. in internal medicine and a Ph.D. in immunology. He has authored more than 50 scientific articles, been awarded over 20 patents, and led more than 50 randomized clinical trials. His decade of research on urolithin A has produced multiple clinically validated products bringing longevity science directly to consumers. Timestamps: 02:45 The discovery and main benefits of urolithin A 05:49 Diet vs supplements and Mitopure's clinical dose 08:28 Immune system aging, inflammaging, and T cells 12:09 How immune decline sits at the heart of aging 15:01 Mitophagy, mitochondrial biogenesis, and cellular cleanup 21:09 How exercise, fasting, and nutrition intersect with urolithin A 24:25 Blood profiling and age-predictive T cell markers 27:17 Cancer resistance, NK cells, and CAR T therapies 28:30 Brain health, cognition, and neuroprotection trials 35:03 Delivery systems, gummies, powder, softgels, and absorption 37:30 Blood tests and urolithin A status 44:27 The future of healthspan and the adaptogenic role of urolithin A 📲 Check out my FREE Top Health Community! - https://joinlifenetwork.com 💊Shop My Curated Marketplace of Vetted Products! - https://shoplifemarket.com 🏋️Sign up for a FREE Coaching Call! - https://jointriumphcoaching.com 📩 Check out my FREE newsletter! - https://bengreenfieldlife.com/newsletter/ 🔗My Website: https://bengreenfieldlife.com/ 🔗My Podcast: https://bengreenfieldlife.com/podcast/ 🔗My Books: https://shopbengreenfieldlife.com/collections/books Connect with me: ⬇️ Instagram https://www.instagram.com/bengreenfieldfitness/ Facebook https://www.facebook.com/BGFitness X https://twitter.com/bengreenfield TikTok https://www.tiktok.com/@bengreenfield