What Is NAD+?
Nicotinamide adenine dinucleotide (NAD+) is a coenzyme found in all living cells, where it plays a fundamental role in cellular energy metabolism and redox biochemistry. As both an electron carrier in metabolic reactions and a substrate for a range of regulatory enzymes, NAD+ occupies a central position in cellular biology. Its concentration within cells declines with age in most studied organisms, which has made it a subject of extensive preclinical and early-phase research investigation.
TrueCanPeptides supplies research-grade NAD+ for qualified laboratory and investigational use. This compound is not a pharmaceutical product and is not intended for self-administration or therapeutic application.
Mechanism of Action — Research Context
NAD+ functions as a cofactor in hundreds of enzymatic reactions, most notably in the electron transport chain processes that drive mitochondrial ATP synthesis. Beyond its role in energy metabolism, NAD+ serves as a substrate for several classes of regulatory enzymes investigated in research contexts:
- Sirtuins (SIRTs): NAD+-dependent deacylases studied in models of gene regulation, mitochondrial biogenesis, and cellular stress response
- PARPs: Poly(ADP-ribose) polymerases that consume NAD+ during DNA damage response processes studied in genomic stability research
- CD38/CD157: NAD+-consuming ectoenzymes studied in immune biology and intracellular calcium signalling research
Modulating NAD+ availability has been studied as a method to influence these downstream pathways in controlled laboratory settings. This research is investigational and preliminary in nature for most applications.
Research Applications
- Cellular energetics: NAD+ is studied as a tool to examine mitochondrial function, electron transport efficiency, and ATP production in cell culture and animal models.
- Sirtuin pathway research: Investigators use NAD+ manipulation to study SIRT1–SIRT7 activity in models of metabolic regulation and chromatin biology.
- DNA repair biology: PARP enzyme activity and its NAD+ consumption are studied in models of genotoxic stress, genome integrity, and cell survival signalling.
- Ageing biology: Preclinical research in rodent models has examined the relationship between NAD+ concentration and markers associated with cellular ageing processes.
- Metabolic disease models: NAD+ precursors and direct NAD+ supplementation have been studied in animal models of obesity, insulin resistance, and mitochondrial dysfunction.
View NAD+ 1000mg — Research Grade
Storage & Handling
NAD+ is relatively sensitive to degradation and requires careful storage to maintain research integrity:
- Store powder form at −20°C in an airtight, moisture-protected container
- Protect from light exposure; use amber vials or opaque storage containers where possible
- Prepare solutions fresh as close to the time of experimental use as feasible
- Avoid prolonged exposure to heat or humidity, which accelerates degradation
- Consult current COA and relevant literature for stability data specific to your application
See our Peptide Storage Guide and Quality & Purity standards for further information.
Related Research
NAD+ research intersects with a broad range of compound categories including mitochondrial peptides such as MOTS-C, longevity-associated compounds like Epithalon, and immune research compounds such as Thymosin Alpha-1. NAD+ precursors (NMN, NR) are also widely studied tools in this research space and are referenced extensively in published literature on cellular metabolism and ageing biology.
Browse the full research peptides in Canada category for related compounds and sourcing information.
Explore the Research Hub or review our guide on What Are Peptides? to build foundational context.
⚠️ Research Use Only: All content on this page is intended strictly for educational and informational purposes. This compound is not approved by Health Canada or any regulatory agency for human therapeutic use. TrueCanPeptides supplies research-grade compounds to qualified researchers only. This is not medical advice. Do not use any information here for self-administration, diagnosis, or treatment. Consult a licensed healthcare professional for any medical concerns.
See also: What is Epithalon?
See also: What is MOTS-c?
NAD+ in Cellular Energy and Signalling
NAD+ (nicotinamide adenine dinucleotide) is not a peptide but a coenzyme — a dinucleotide consisting of adenosine monophosphate and nicotinamide mononucleotide linked by a phosphoanhydride bond. It exists in two forms: the oxidized form (NAD+) and the reduced form (NADH). The NAD+/NADH redox couple is central to cellular energy metabolism: NAD+ is the electron acceptor in glycolysis and the TCA cycle, producing NADH that feeds electrons into the mitochondrial electron transport chain for ATP synthesis.
Beyond its role in redox metabolism, NAD+ is a substrate (not a catalytic cofactor) for several classes of NAD+-consuming enzymes:
- Sirtuins (SIRT1-7): NAD+-dependent deacylases that regulate gene expression, DNA repair, and mitochondrial function. SIRT1 and SIRT3 are major research targets in aging and metabolic biology.
- PARPs (Poly-ADP-ribose polymerases): NAD+-consuming enzymes activated by DNA damage that facilitate DNA repair. PARP1 consumes large amounts of NAD+ during DNA damage responses.
- CD38/CD157: NAD+-consuming ecto-enzymes involved in immune cell signalling and calcium second messenger production (cADPR synthesis).
NAD+ Decline and Research Interest
Intracellular NAD+ levels decline with age in multiple tissues — a finding observed across species including humans. This decline has been attributed to increased PARP and CD38 activity with age, reduced biosynthetic capacity, and altered salvage pathway activity. The age-associated NAD+ decline has been proposed as a contributing factor to mitochondrial dysfunction, reduced sirtuin activity, and impaired DNA repair capacity seen in aging cells.
This research background has driven interest in NAD+ precursors (NMN, NR) and direct NAD+ supplementation as tools for restoring cellular NAD+ in aging research models. TrueCanPeptides supplies both 500mg and 1,000mg formats of research-grade NAD+ for in vitro research use.
NAD+ vs NMN vs NR: Research Tool Comparison
| Compound | Type | NAD+ pathway entry | Research context |
|---|---|---|---|
| NAD+ | Coenzyme (direct) | Direct — no conversion needed | In vitro NAD+ repletion; enzyme substrate studies |
| NMN | Nucleotide precursor | Via NMNAT enzymes | Precursor supplementation; systemic models |
| NR | Nucleoside precursor | Via NRK1/2 then NMNAT | Orally bioavailable precursor research |
Storage and Handling
- Store lyophilized at −20°C or −80°C; NAD+ is susceptible to hydrolysis in aqueous solution at neutral-to-basic pH
- Reconstitute in slightly acidic buffer (pH 5-6) or sterile water; use promptly or aliquot and freeze immediately
- Avoid alkaline conditions and elevated temperatures — accelerate hydrolysis
- Post-reconstitution: stable at −20°C for weeks in aliquots; avoid repeated freeze-thaw
NAD+ is supplied for qualified in vitro laboratory research purposes only. Not for human or animal administration. Not evaluated or approved by Health Canada.
Available: NAD+ 500mg | NAD+ 1000mg | 5-Amino-1MQ (NNMT inhibitor) guide
Frequently Asked Questions — NAD+ Research
What is NAD+ and why is it studied in research?
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme present in every living cell. It is studied because of its central role in cellular energy metabolism, DNA repair signalling, and as a substrate for sirtuin enzymes — all of which are active areas in ageing biology, metabolic disease, and mitochondrial research.
How does NAD+ differ from NMN and NR?
NAD+ is the active coenzyme itself. NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside) are biosynthetic precursors that cells convert into NAD+ through enzymatic pathways. For direct in vitro research — cell culture assays, enzyme activity studies — NAD+ is used directly. NMN and NR are more commonly used in systemic animal model research.
Does NAD+ decline with age?
Preclinical research has consistently observed that intracellular NAD+ levels decline in multiple tissues with age across several species, including rodents and humans. This has been attributed to increased NAD+-consuming enzyme activity (CD38, PARPs) and reduced biosynthetic capacity. Whether restoring NAD+ in aged organisms produces meaningful functional changes remains an active area of research investigation.
What are sirtuins and why do they matter in NAD+ research?
Sirtuins (SIRT1–SIRT7) are a family of NAD+-dependent deacylase enzymes that regulate gene expression, mitochondrial biogenesis, and stress response pathways. Because sirtuin activity is directly coupled to NAD+ availability, researchers use NAD+ manipulation as a tool to modulate sirtuin-dependent pathways in model systems. SIRT1 and SIRT3 are particularly studied in metabolic and ageing biology contexts.
How should NAD+ be stored in a laboratory setting?
Lyophilized NAD+ powder should be stored at −20°C in an airtight, moisture-protected container, away from light. Upon reconstitution, NAD+ is susceptible to hydrolysis, particularly at neutral to alkaline pH. Use slightly acidic buffer (pH 5–6) or sterile water, prepare aliquots immediately, and store at −20°C. Avoid repeated freeze-thaw cycles and prolonged exposure to heat or humidity.
Is NAD+ the same as NADH?
No. NAD+ and NADH are the two interconvertible forms of the same molecule. NAD+ is the oxidized form that accepts electrons; NADH is the reduced form that donates electrons in the mitochondrial electron transport chain to drive ATP synthesis. The NAD+/NADH ratio is a key indicator of cellular redox state studied in metabolic biology research.