NAD+
Nicotinamide adenine dinucleotide — endogenous coenzyme functioning as an electron carrier in oxidative phosphorylation and as the obligate co-substrate for sirtuin histone deacetylases and PARP1. Studied in longevity research for its role in mitochondrial biogenesis, DNA repair, and age-related metabolic decline.
Mechanism of Action
NAD+ (nicotinamide adenine dinucleotide) is a dinucleotide coenzyme present in all living cells, participating in hundreds of enzymatic reactions. In its oxidised form (NAD+), it accepts electrons from metabolic substrates to become NADH, which then donates electrons to the mitochondrial electron transport chain to drive ATP synthesis. The NAD+/NADH ratio serves as a key indicator of cellular redox state and metabolic activity.
Beyond its role as an electron carrier, NAD+ is the obligate co-substrate for sirtuin proteins (SIRT1–SIRT7) — a family of NAD+-dependent histone deacetylases and ADP-ribosyltransferases. Sirtuins consume NAD+ in every catalytic cycle, cleaving it to release nicotinamide and ADP-ribose while deacetylating target proteins. SIRT1 activation downstream promotes nuclear translocation of PGC-1α, a master regulator of mitochondrial biogenesis and oxidative metabolism. The consequent link between cellular NAD+ abundance and mitochondrial mass is a central axis studied in aging and metabolic research.
NAD+ also serves as the co-substrate for PARP1 (poly ADP-ribose polymerase 1), which consumes large quantities of NAD+ during DNA strand break repair by poly-ADP-ribosylating nearby chromatin proteins. Under conditions of high genotoxic stress, PARP1 activity can substantially deplete intracellular NAD+ pools. Research examines whether NAD+ repletion supports DNA repair capacity by maintaining PARP1 substrate availability.
CD38 and CD157 ectoenzymes have been identified as major NAD+ hydrolases in mammalian tissues, and their activity increases with aging — providing one proposed mechanism for age-related NAD+ decline. The calcium signalling function of CD38 (which generates cADPR from NAD+) further links NAD+ metabolism to cellular Ca2+ dynamics.
Key Research Findings
- Guarente and colleagues established that SIRT1 activation requires NAD+ as obligate co-substrate and that declining NAD+ levels with age correlate with reduced sirtuin activity in multiple tissues, work published across Cell and related journals in the 2000s. Guarente group publications, Cell, 2000s.
- PARP1 consumption of NAD+ during DNA repair constitutes a major metabolic drain on cellular NAD+ pools; supplementation studies examine whether restoring NAD+ pools supports DNA repair capacity. Johnson & Guarente, Cold Spring Harb Perspect Biol, 2013.
- Mitochondrial biogenesis studies in aged rodent models have described restoration of skeletal muscle mitochondrial function and exercise capacity following NAD+ precursor administration, with effects attributed to SIRT1/PGC-1α axis restoration. Sinclair research group, Harvard Medical School, NAD+ precursor preclinical literature.
- CD38 ectoenzyme activity has been identified as a major contributor to age-related NAD+ decline; CD38 inhibition combined with NAD+ supplementation has been studied in longevity and metabolic research models. Chini research group, Mayo Clinic, CD38 / NAD+ ageing literature.
- NAD+ levels in neuronal tissue have been studied across multiple model systems for neuroprotective relevance, given the high energy demands of neurons and the expression of NAD+-dependent enzymes including SIRT1, SIRT3, and PARP1 in brain tissue. Imai and Sinclair research groups, NAD+ neuroscience and neuroprotection literature.
Citations last reviewed: 1 October 2026
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Researcher FAQ
What is NAD+ in a research context?
NAD+ (nicotinamide adenine dinucleotide) is an endogenous coenzyme present in all living cells. In research contexts it is studied as the obligate co-substrate for sirtuin histone deacetylases (SIRT1–SIRT7), as a co-substrate for PARP1 in DNA repair, and as a key determinant of cellular redox state through the NAD+/NADH ratio. Age-related decline in NAD+ levels is a central focus of longevity research.
How does NAD+ support sirtuin research?
Sirtuins (SIRT1–SIRT7) are NAD+-dependent enzymes that require NAD+ as an obligate co-substrate for their deacetylase activity — consuming it in every catalytic cycle. When NAD+ levels decline, sirtuin activity decreases proportionally. Supplementation research examines whether restoring NAD+ pools can rescue sirtuin activity and downstream pathways including mitochondrial biogenesis via PGC-1α, genome stability, and stress response gene regulation.
What are the storage conditions for NAD+ powder?
NAD+ powder is best stored at −20 °C or alternatively at 2–8 °C in a desiccated, oxygen-free environment. NAD+ is hygroscopic and susceptible to oxidative degradation; exposure to moisture and oxygen should be minimised. Aliquoting before freezing reduces repeated exposure during experimental use.
What makes NAD+ relevant to longevity research?
NAD+ occupies a central position in longevity research because its intracellular levels decline with age in multiple tissues. This decline correlates with reduced sirtuin activity, impaired PARP1-mediated DNA repair, and mitochondrial dysfunction. Research models examine whether NAD+ repletion can restore these functions and modulate aging-associated biological endpoints.
Does BasedPeps provide purity documentation?
Yes. Every BasedPeps lot includes a third-party Certificate of Analysis documenting HPLC purity (≥99%) and identity confirmation. Certificates of Analysis are available per batch on request.
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Research-grade nicotinamide adenine dinucleotide. Third-party HPLC verification per lot. Certificate of Analysis available on request. Dispatched from Riga, Latvia within 24 hours.
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