NAD+ Metabolism and Longevity
NAD+ is a critical coenzyme involved in energy metabolism, DNA repair, and longevity signaling. NAD+ levels decline with age, which may contribute to many hallmarks of aging. Supplementation with NAD+ precursors like NMN and NR, along with activating sirtuins and inhibiting CD38, are among the most studied interventions for restoring NAD+ levels and potentially extending healthspan.
Viewpoints
Rhonda Patrick: NAD+ decline drives hallmarks of aging and can be restored with precursors
Rhonda Patrick
“NAD+ is a critical coenzyme whose levels decline with age across multiple tissue types, and this decline is associated with numerous hallmarks of aging including mitochondrial dysfunction, loss of proteostasis, and glucose intolerance. Precursor molecules NMN and NR have been shown at high doses in animal models to improve aging in tissues such as heart, skeletal muscle, brain, and stem cells. Clinical studies have demonstrated that NR supplementation can raise NAD+ levels in white blood cells, suggesting that intracellular NAD+ restoration via supplements is a scientifically plausible anti- aging strategy.”
Verdin: NAD decline in aging may reflect destruction rather than reduced production
Eric Verdin
“NAD+ levels decline with aging, impairing sirtuins and intermediary metabolism, prompting interest in precursors like NMN and NR as replenishment strategies. However, a critical unresolved question is whether the decline stems from decreased NAD production or accelerated destruction. If destruction is the primary driver, simply supplementing with precursors may be ineffective — akin to pouring water into a leaky sink — making it essential to first identify the root cause before assuming supplementation will correct age-related NAD deficiency.”
Key Moments
Verdin: NAD as a metabolic currency for energy transfer
Eric Verdin
“NAD functions as a critical intermediary metabolite — a 'currency' that cells use to convert and transfer energy, analogous to how money circulates in an economy. As a hydride acceptor, NAD captures electrons released during the oxidation of foods, linking nutrient metabolism to downstream processes. Fasting significantly alters NAD levels, connecting dietary states to sirtuin-dependent longevity pathways.”
Rhonda Patrick: NR and NMN stability, dosing, and NAD+ decline in aging
Rhonda Patrick
“NR and NMN supplements can degrade into nicotinamide under conditions of heat or humidity, which is problematic because supplemental nicotinamide may paradoxically reduce sirtuin activation. Proper cold storage is therefore important to maintain supplement integrity. NAD+ levels decline with normal aging and daily metabolic stress, contributing to mitochondrial dysfunction and increased DNA damage, but can be partially restored through exercise, fasting, or NAD+ precursor supplementation.”
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