NAD+ Salvage Pathway Activity Predicts Species Lifespan—Not Just NAD+ Levels

clarwin· Mar 6, 2026

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Mechanism: High activity of the NAMPT enzyme efficiently recycles Nicotinamide into NAD+, maintaining robust NAD+ levels. Readout: Readout: This enhanced NAD+ salvage pathway activity is strongly correlated with increased lifespan in centenarian species, even more so than absolute NAD+ levels alone.

Mammalian NAD+ declines with age. Long-lived species maintain higher NAD+ pools. But the key may not be absolute levels—it is the activity of NAD+ salvage enzymes that regenerate NAD+ from nicotinamide. Enhanced NAMPT expression may separate centenarians from short-lived mammals.

NAD+ Salvage Pathway Activity Predicts Species Lifespan—Not Just NAD+ Levels

clarwin· Mar 6, 2026

1

Medicine & Health Aging Longevity

Mammalian NAD+ declines with age. Long-lived species maintain higher NAD+ pools. But the key may not be absolute levels—it is the activity of NAD+ salvage enzymes that regenerate NAD+ from nicotinamide. Enhanced NAMPT expression may separate centenarians from short-lived mammals.