What Is NAD+?
Nicotinamide adenine dinucleotide (NAD+) is a coenzyme found in all living cells, playing a central role in cellular energy metabolism and redox biology. While not a peptide in the strict chemical sense, NAD+ and its precursors (including nicotinamide mononucleotide and nicotinamide riboside) are widely researched alongside peptide compounds in the context of ageing biology, metabolic regulation, and cellular resilience. NAD+ concentrations decline significantly with age, making it a key target in longevity research.
Mechanism of Action
NAD+ functions as an essential electron carrier in oxidative phosphorylation and the citric acid cycle, facilitating ATP production in mitochondria. Beyond its role in energy metabolism, NAD+ serves as a substrate for sirtuins (SIRT1–7), a family of NAD+-dependent deacetylases involved in gene expression regulation, DNA repair, and stress responses. It also acts as a co-substrate for poly(ADP-ribose) polymerases (PARPs), which are critical enzymes in DNA damage detection and repair. Additionally, NAD+ is required by cyclic ADP-ribose hydrolases such as CD38 and CD157, linking it to calcium signalling and immune function.
Research Areas
NAD+ is studied across a broad range of research areas, including cellular ageing and senescence, mitochondrial dysfunction, neurodegenerative disease models, metabolic syndrome, DNA damage and repair, and sirtuin-mediated gene regulation. Researchers investigating longevity interventions frequently study NAD+ precursor supplementation in model organisms, with publications from leading institutions demonstrating effects on mitochondrial biogenesis, muscle function, and lifespan in preclinical models. It is also of interest in the study of PARP inhibition and chemotherapy sensitisation.
Research Context
The scientific literature on NAD+ biology has expanded substantially since the identification of sirtuins as NAD+-dependent enzymes in the early 2000s. Landmark studies in rodent models demonstrated that restoring NAD+ levels via precursor supplementation could ameliorate age-related physiological decline. Human clinical trials investigating NAD+ precursor compounds are ongoing, with published data available on pharmacokinetics, safety profiles, and biomarker outcomes. NAD+ itself is used in cell biology research as a reference compound and substrate in enzymatic assays.
Research Considerations
NAD+ is supplied in lyophilised or powdered form and should be stored at -20°C and protected from light and moisture to prevent degradation. Researchers should note that NAD+ is chemically distinct from its reduced form NADH and its precursors NMN and NR; experimental protocols should specify the exact compound used. Purity verification is essential, as impurities can significantly affect enzymatic assay results.
Where to Source NAD+ in Europe
Peptifly supplies NAD+ in lyophilised vials for research use, independently tested for 99%+ purity by a third-party laboratory. We dispatch from EU-based fulfilment centres with temperature-controlled packaging to maintain compound integrity during transit. Browse our full catalogue at peptifly.com/shop.
Frequently Asked Questions
How does NAD+ relate to sirtuin biology?
Sirtuins are a family of NAD+-dependent deacetylase enzymes that regulate gene expression, DNA repair, and metabolic homeostasis. Without sufficient NAD+, sirtuin activity declines, which is one proposed mechanism linking age-related NAD+ depletion to physiological ageing phenotypes.
What is the difference between NAD+, NMN, and NR?
NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside) are biosynthetic precursors that are converted to NAD+ intracellularly. NAD+ itself is used directly in biochemical assays and cell biology research, whereas NMN and NR are more commonly studied as supplementation strategies in animal models and clinical trials.
Where can I buy NAD+ in Europe?
Peptifly supplies NAD+ for research use with EU dispatch and independent purity verification. Order at peptifly.com/shop.
Disclaimer: All peptides sold by Peptifly are strictly for research and laboratory use only. This article is for informational purposes only.