NAD⁺ (Nicotinamide Adenine Dinucleotide) Overview

Nicotinamide adenine dinucleotide (NAD⁺) is an essential endogenous coenzyme found in all living cells. It plays a central role in cellular energy metabolism, redox reactions, DNA repair, and signaling pathways related to aging and stress resistance. NAD⁺ levels naturally decline with age and in association with metabolic stress, inflammation, and certain disease states, making it a major focus of aging, metabolic, and mitochondrial research.

Core Biological Functions of NAD⁺

Cellular Energy Production

NAD⁺ is a critical electron carrier in glycolysis, the tricarboxylic acid (TCA) cycle, and oxidative phosphorylation. By cycling between oxidized (NAD⁺) and reduced (NADH) forms, it enables ATP generation and normal mitochondrial function.

Supported by:
Cantó et al., Cell Metabolism; Ying, Antioxidants & Redox Signaling

DNA Repair and Genomic Stability

NAD⁺ serves as a required substrate for poly(ADP-ribose) polymerases (PARPs), enzymes involved in detecting and repairing DNA damage. Adequate NAD⁺ availability is necessary to maintain genomic stability, particularly under conditions of oxidative or metabolic stress.

Supported by:
Luo et al., Molecular Cell; Houtkooper et al., Nature Reviews Molecular Cell Biology

Regulation of Sirtuin Activity

NAD⁺ is an obligate cofactor for sirtuins (SIRT1–SIRT7), a family of enzymes that regulate mitochondrial biogenesis, inflammation, metabolic adaptation, and cellular stress responses. Declining NAD⁺ levels are associated with reduced sirtuin activity in aging models.

Supported by:
Imai & Guarente, Nature Reviews Molecular Cell Biology

NAD⁺ and Aging-Related Research

Age-Associated Decline in NAD⁺

Multiple studies demonstrate that NAD⁺ concentrations decrease with age in mammalian tissues. This decline has been linked to mitochondrial dysfunction, impaired DNA repair, and increased inflammation, all of which are hallmarks of aging.

Supported by:
Zhang et al., Cell Metabolism; Covarrubias et al., Nature Metabolism

Restoration of NAD⁺ Levels in Preclinical Models

In animal and cellular studies, restoring NAD⁺ levels—often via precursor molecules—has been shown to improve mitochondrial function, enhance metabolic flexibility, and support tissue resilience. These findings drive ongoing research but do not yet equate to proven anti-aging therapies in humans.

Supported by:
Mills et al., Cell Metabolism; Yoshino et al., Cell Metabolism

Metabolic and Mitochondrial Research

Insulin Sensitivity and Metabolic Regulation

NAD⁺-dependent pathways influence glucose and lipid metabolism through sirtuin and AMPK-linked signaling. Human and animal studies suggest that improving NAD⁺ availability may support metabolic health, though clinical outcomes vary depending on intervention and population.

Supported by:
Yoshino et al., Cell Metabolism; Trammell et al., Nature Communications

Mitochondrial Function and Stress Resistance

NAD⁺ plays a key role in maintaining mitochondrial integrity and adaptive responses to energetic stress. Experimental models show improved mitochondrial efficiency and stress tolerance when NAD⁺ homeostasis is preserved.

Supported by:
Cantó et al., Cell Metabolism; Houtkooper et al., Nature Reviews Molecular Cell Biology

NAD⁺ Specifications

• Chemical Name: Nicotinamide adenine dinucleotide (oxidized form)

• CAS Number: 53-84-9

• Molecular Formula: C₂₁H₂₇N₇O₁₄P₂

• Molecular Weight: 663.43 g/mol

• Class: Pyridine nucleotide / redox coenzyme

• Form: Commonly supplied as powder or solution (research grade)

• Solubility: Water-soluble

• Storage: Store refrigerated or frozen per supplier guidance

Important Notice

NAD⁺ is a fundamental biological molecule, but its therapeutic use outside approved clinical contexts remains investigational. Descriptions of NAD⁺ for commerce or distribution should be limited to research and educational purposes unless part of an FDA-approved drug or clinical protocol. It must not be marketed as a drug, dietary supplement, cosmetic, or medical treatment without proper regulatory authorization.

References

1. Cantó C, et al. NAD⁺ metabolism and the control of energy homeostasis. Cell Metabolism.
   https://pubmed.ncbi.nlm.nih.gov/20374964/

2. Houtkooper RH, et al. The secret life of NAD⁺: an old metabolite controlling new metabolic signaling pathways. Nature Reviews Molecular Cell Biology.
   https://pubmed.ncbi.nlm.nih.gov/23590258/

3. Imai S-I, Guarente L. NAD⁺ and sirtuins in aging and disease. Nature Reviews Molecular Cell Biology.
   https://pubmed.ncbi.nlm.nih.gov/25321028/

4. Zhang H, et al. NAD⁺ repletion improves mitochondrial and stem cell function and enhances life span in mice.Cell Metabolism.
   https://pubmed.ncbi.nlm.nih.gov/25417168/

5. Covarrubias AJ, et al. NAD⁺ metabolism, immunity, and inflammation. Nature Metabolism.
   https://pubmed.ncbi.nlm.nih.gov/32047215/

6. Yoshino J, et al. Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women. Cell Metabolism.
   https://pubmed.ncbi.nlm.nih.gov/28753427/

7. Trammell SAJ, et al. Nicotinamide riboside is uniquely and orally bioavailable in humans. Nature Communications.
   https://pubmed.ncbi.nlm.nih.gov/27721479/

8. Luo X, et al. PARP-1 and NAD⁺-dependent DNA repair mechanisms. Molecular Cell.
   https://pubmed.ncbi.nlm.nih.gov/17482544/

Complete Disclaimer

This product is sold exclusively for laboratory research purposes under Section 351 of the Public Health Service Act. It is not intended for human or veterinary use, nor for diagnostic, therapeutic, or cosmetic applications. Purchaser certifies they are properly licensed and equipped to handle research compounds in compliance with all local, state, and federal regulations. EaglePeptidesUSA assumes no liability for misuse or unauthorized handling. By purchasing, you affirm this material will not be introduced into interstate commerce or used in food/drug products.