Summary
Andrew Huberman speaks with Dr. Peter Attia, a Stanford and Johns Hopkins-trained physician and host of The Drive podcast, about whether popular longevity supplements actually extend lifespan. They evaluate the NAD pathway in detail -- comparing NAD, NMN, and NR supplementation, different routes of administration, bioavailability, and safety profiles. Dr. Attia explains how sirtuins, caloric restriction, and the NAD pathway interact, and why results from yeast and mouse studies have not clearly translated to human longevity benefits. The Interventions Testing Program (ITP), which tests compounds in genetically diverse mice, provides the most rigorous animal data.
They discuss rapamycin as the most promising pharmacological longevity intervention based on ITP data, while noting human evidence remains limited. Resveratrol is largely dismissed based on failed replication of early sirtuin activation claims. Both share their personal supplement regimens -- Huberman takes NMN, NR, and various micronutrients, while Attia takes a more conservative approach. The central conclusion is that no supplement has demonstrated clear lifespan extension in humans, and the foundational behaviors -- exercise (especially resistance training and cardio), sleep, nutrition, and stress management -- remain far more impactful than any supplement for longevity. They also discuss biological age tests, radiation and cancer risk, and exercise timing for optimal energy.
Key Points
- No supplement has demonstrated clear lifespan extension in humans -- foundational behaviors (exercise, sleep, nutrition) remain far more impactful than any pill
- NAD, NMN, and NR supplementation increases circulating NAD levels but has not shown meaningful clinical longevity benefits in human trials
- Rapamycin shows the most consistent lifespan extension in the Interventions Testing Program (mice), but human longevity data remains limited
- Resveratrol's early promise was based on sirtuin activation claims that largely failed to replicate in subsequent studies
- NR supplementation shows a potential benefit for fatty liver disease (reducing liver inflammation markers) and nicotinamide may reduce skin cancer risk
- Biological age tests (epigenetic clocks) show correlation with chronological age but their ability to predict individual health trajectory or respond to interventions remains unproven
- Exercise -- particularly resistance training to maintain type 2 muscle fibers and cardiovascular training for VO2 max -- is the single most impactful intervention for healthy aging
Key Moments
Peter Attia on NAD and longevity supplements
Dr. Peter Attia reviews the NAD pathway as a longevity target, comparing NR, NMN, and direct NAD infusions.
"He systematically reviews the research literature, the clinical trials, and maintains an avid clinical practice."
Attia takes rapamycin weekly for longevity
Peter Attia takes 8mg rapamycin weekly for its geroprotective potential, tolerating mouth sores as a biomarker of drug activity.
"I take eight milligrams once a week for as long as I can tolerate it. I get these vicious aphthous ulcers. About 10% of people get them."
NAD is a cofactor in 500-600 body pathways
NAD is one of the most ubiquitous molecules in the body, tightly regulated like glucose and pH, serving hundreds of enzyme pathways.
"NAD is one of the most ubiquitous molecules in the body. Somewhere between five and 600 pathways utilize NAD as a cofactor."
NAD boosting may fuel cancer cell growth
Since cancer cells depend on NAD for replication, boosting NAD could theoretically support tumor growth alongside healthy cells.
"Remember at the outset I said there's two big categories to think about NAD. Most of what NAD is doing is operating as a cofactor for electron shuttling."
Sirtuin activation drove the NAD supplement hype
The thesis that NAD precursors activate sirtuins to extend lifespan drove massive commercial interest, but mouse data is mixed.
"For the purpose of how people actually do this, they intravenously get NAD because it's not orally bioavailable."
NMN and NR human trials show weak results
Human trials of NMN and NR show statistically significant but clinically insignificant effects on glucose disposal.
"NR can cross the cell membrane directly. NMN cannot. The FDA has essentially said that NMN should not be sold as a supplement."
Early morning exercise boosts all-day energy
Forcing yourself to exercise early dramatically increases energy throughout the day, even if a brief nap is still needed.
"In the few times where I've kicked my own butt to get out and start working out really early, I have more energy all day long."
Supplements are insurance, not essentials
Peter Attia compares supplements to the menu on the Titanic: exercise, sleep, nutrition, and mental health matter exponentially more.
"All this supplement stuff is equivalent to were they serving lobster or steak. The direction of the Titanic is how you eat, sleep, and train."
