In this episode of The Human Upgrade, world-renowned nitric oxide researcher Dr. Nathan S. Bryan joins the show to explore what may be the most important molecule for modern health. With more than two decades of research, advisory roles in major biotech companies, and his history as a founding formulator of HumanN, Dr. Bryan explains why nitric oxide could be considered the “penicillin of the 21st century.”
During this conversation, The Human Upgrade audience gains a clear understanding of what nitric oxide is, how the body makes it, and why nitric oxide levels decline due to diet, aging, oral microbiome disruption, poor breathing habits, and everyday lifestyle choices. Dr. Bryan outlines the early symptoms of nitric oxide deficiency—many of which are subtle or commonly overlooked—and provides practical steps to restore nitric oxide through food, sunlight, nasal breathing, targeted supplementation, and oral microbiome support.
The episode unpacks how nitric oxide affects circulation, oxygen delivery, cognitive performance, endurance, sexual health, and metabolism. Dr. Bryan also explains how mouthwash, fluoride, and gut–oral axis imbalance suppress nitric oxide production and why strengthening the mouth microbiome is essential for optimal NO signaling. Listeners of The Human Upgrade also learn about the product technologies designed to restore nitric oxide production, the challenges slowing public adoption of nitric oxide science, and how nitric oxide may help improve outcomes across a wide range of chronic diseases.
Additional highlights include Dr. Bryan’s insights on caffeine, sauna use, micronutrient synergy, slow eating, detox binders, and the mission behind his upcoming book The Secret of Nitric Oxide. This is a practical, evidence-driven episode that gives The Human Upgrade community clear steps to improve nitric oxide levels and support overall performance and well-being.