NAD Expert Reveals Which Supplements Actually Work and Why Exercise Beats Pills
Dr. Charles Brenner separates NAD science from hype, explaining what really boosts levels and fights inflammation.
Summary
Dr. Charles Brenner, the scientist who discovered nicotinamide riboside (NR), explains how NAD metabolism really works in aging and disease. Contrary to popular belief, blood NAD levels don't necessarily decline with age in healthy people, but tissue NAD becomes depleted during inflammatory conditions like obesity, infections, and chronic stress. Eight clinical trials now show NR supplementation reduces inflammation markers in humans. Disease states, not aging itself, appear to be the primary drivers of NAD depletion through activation of PARP enzymes that consume NAD during stress responses.
Detailed Summary
This interview with Dr. Charles Brenner, discoverer of nicotinamide riboside, challenges common assumptions about NAD and aging while revealing what the science actually shows. Brenner explains that healthy aging doesn't necessarily cause blood NAD decline, but inflammatory disease states consistently deplete tissue NAD levels through activation of PARP enzymes that consume NAD during cellular stress responses.
The discussion covers how obesity, insulin resistance, infections like COVID-19, and chronic inflammation tax the NAD system by creating a 'perfect storm' that churns through NADPH faster than cells can replenish it. Brenner's research found coronavirus infection activates five different PARP family members, explaining why viral illnesses can be so metabolically taxing.
Eight randomized controlled trials now demonstrate that nicotinamide riboside supplementation (around 1 gram daily) produces anti-inflammatory effects in humans, lowering markers like IL-6 and IL-10. Professional sports teams, including the New England Patriots during Tom Brady's era, have used NR for recovery, though rigorous exercise studies are still needed.
Exercise emerges as a key NAD supporter by increasing expression of NAD biosynthetic enzymes and promoting mitochondrial biogenesis. Sleep disruption and circadian misalignment also appear to disturb NAD metabolism, though human data remains limited. Brenner emphasizes that addressing root causes of inflammation - whether obesity, poor sleep, or excessive alcohol - likely provides more benefit than simply measuring NAD levels, which he considers unnecessary for most individuals outside clinical trials.
Key Findings
- Eight clinical trials show nicotinamide riboside reduces inflammation markers in humans at ~1g daily doses
- Disease states like obesity and infections deplete NAD by activating PARP enzymes, not aging itself
- Exercise increases NAD biosynthetic enzyme expression and supports mitochondrial biogenesis
- Blood NAD testing has limited value for individuals outside clinical research settings
- Professional athletes use NR for recovery, though controlled exercise studies are needed
Methodology
This is an in-depth interview on FoundMyFitness, a respected science communication platform hosted by Dr. Rhonda Patrick. Dr. Brenner is a credible source as the original discoverer of nicotinamide riboside and current professor at City of Hope.
Study Limitations
Dr. Brenner discloses financial interests in Niagen (NR supplement) and NAD testing companies. Some exercise and sleep effects on NAD are based on animal studies with limited human validation. Long-term safety data for high-dose NR supplementation remains incomplete.
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