NAD+ (Nicotinamide) at a glance
A fast read for beginners, with evidence strength, route context, safety depth, and community activity surfaced before the deeper sections.
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every living cell that is central to two of the most fundamental biological processes: energy metabolism and DNA repair. It serves as an electron carrier in the mitochondrial electron transport chain and as a substrate for sirtuins (longevity proteins), PARP enzymes (DNA repair), and CD38 (immune function).
NAD+ levels decline by 40-60% between young adulthood and old age, a decline linked to mitochondrial dysfunction, increased DNA damage, impaired sirtuin activity, and the accumulated cellular senescence associated with aging. Restoring NAD+ levels - whether through direct supplementation, or precursors such as NMN or NR - has become one of the most actively researched longevity interventions.
While oral supplementation provides meaningful elevation of NAD+ levels, IV infusion produces the most dramatic acute increases and is widely used in longevity clinics. The research base is extensive, spanning basic science through early human trials, though large-scale human longevity trials are still ongoing.
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