NAD+ (Nicotinamide Adenine Dinucleotide)

What Is NAD+?

NAD+ (Nicotinamide Adenine Dinucleotide) is a coenzyme found in every living cell and is considered one of the most critical molecules in cellular metabolism. It functions as a central electron carrier in redox reactions (accepting and donating electrons) and serves as a required substrate for a family of enzymes — including sirtuins (SIRT1–7) and PARPs — that regulate DNA repair, gene expression, stress response, and longevity-associated pathways.

NAD+ levels decline dramatically with age — by as much as 50% between ages 40 and 60 in some tissue compartments — and this decline has been proposed as a mechanistic contributor to aging-associated metabolic dysfunction, mitochondrial deterioration, and impaired stress response. The Sinclair Lab (Harvard), Verdin Lab (Gladstone), and others have published extensively on NAD+ biology and aging.

Research-grade NAD+ for in vitro studies differs from oral NAD+ precursor supplements (NMN, NR) in that it is the direct coenzyme form. For laboratory cell culture and enzyme assay applications, direct NAD+ is the appropriate research reagent — it does not require conversion by cellular enzymes before it can serve as a substrate.

Research & Published Studies

• Gomes et al. (Cell, 2013): Demonstrated that NAD+ decline in aged mice disrupts nuclear-mitochondrial communication via SIRT1/HIF-1α pathway, and that NAD+ restoration reversed mitochondrial dysfunction — a landmark paper for NAD+ aging research.
• Rajman et al. (Cell Metabolism, 2018): Reviewed evidence that NAD+ supplementation ameliorates metabolic disease, age-associated physiological decline, and a broad spectrum of diseases in preclinical models, establishing NAD+ as a therapeutic target.
• PARP substrate: NAD+ is consumed by PARP enzymes during DNA damage repair. Research demonstrates that PARP hyperactivation during oxidative stress depletes cellular NAD+, linking DNA damage, NAD+ depletion, and metabolic dysfunction in a feedback loop.
• Sirtuin activation: Sirtuins (SIRT1–7) require NAD+ as a co-substrate for their deacetylase activity. These enzymes regulate metabolic homeostasis, stress resistance, and longevity pathways — making NAD+ availability rate-limiting for their function.
• Cancer metabolism research: Elevated NAMPT (the rate-limiting enzyme in NAD+ biosynthesis) is observed in many tumor types, making NAD+ metabolism a target in oncology research with inhibitors under active clinical investigation.

Research Use Cases

• Sirtuin activity assays and longevity pathway research
• PARP enzyme studies and DNA repair research
• Mitochondrial electron transport chain studies
• Aging biology and cellular senescence research
• Metabolic disease models (in vitro and cell culture)
• Longevity stack protocols (NAD+ + Epithalon + SS-31)

Specifications

Related Research Compounds