NAD+

### **NAD+ (Nicotinamide Adenine Dinucleotide)** **Product Description for Laboratory Research Use Only** Nicotinamide Adenine Dinucleotide (NAD+) is a fundamental coenzyme found in all living cells, serving as a critical electron carrier in redox reactions and a substrate for enzymes involved in genomic stability. In the context of *in vitro* research, NAD+ exists as a central metabolic node, oscillating between its oxidized (NAD+) and reduced (NADH) forms. It acts as an essential cofactor for enzymes such as glyceraldehyde-3-phosphate dehydrogenase (GAPDH) in glycolysis and several complexes within the mitochondrial electron transport chain. Beyond its role in energy metabolism, NAD+ is a requisite co-substrate for poly(ADP-ribose) polymerases (PARPs), sirtuins (SIRTs), and cADP-ribose synthases (CD38/CD157), which regulate intracellular signaling, DNA repair mechanisms, and calcium homeostasis. Laboratory investigations often utilize NAD+ to explore its influence on cellular senescence, mitochondrial biogenesis, and epigenetic regulation. Researchers focusing on metabolic pathophysiology utilize NAD+ to examine the flux of the tricarboxylic acid (TCA) cycle and the modulation of oxidative stress pathways within cell culture models. Additionally, NAD+ is a primary subject of interest in research involving the "NAD+ metabolome," where scientists investigate the biosynthetic precursors (such as NMN or NR) and the enzymatic degradation pathways that dictate cellular NAD+ availability. Its role in activating SIRT1, a NAD+-dependent deacetylase, makes it a critical tool for studying transcriptional regulation and chromatin remodeling in response to metabolic shifts. **Reconstitution, Storage, and Handling** NAD+ is typically supplied as a lyophilized powder to ensure chemical stability. For experimental use, it should be reconstituted in sterile deionized water or an appropriate laboratory buffer (such as PBS). Once in aqueous solution, NAD+ is susceptible to hydrolytic degradation; therefore, it is recommended to prepare small, single-use aliquots to avoid repeated freeze-thaw cycles. The lyophilized product should be stored at -20°C for long-term stability, while reconstituted solutions should be kept at -80°C and used promptly. Researchers should maintain a neutral pH during handling, as NAD+ is particularly unstable in alkaline environments. *** **WARNING: This product is intended for IN-VITRO LABORATORY RESEARCH ONLY. It is not for human or veterinary use. It must not be used for diagnostic or therapeutic purposes. Proper laboratory safety protocols and personal protective equipment (PPE) must be utilized at all times when handling this compound.***