NAD+

Overview

NAD+ (Nicotinamide Adenine Dinucleotide) is a coenzyme present in every living cell, essential for over 500 enzymatic reactions. It is a central molecule in cellular energy metabolism, DNA repair, and epigenetic regulation. NAD+ levels decline significantly with age, and this decline is implicated in numerous age-related pathologies.

Mechanism of Action

NAD+ serves as an electron carrier in mitochondrial oxidative phosphorylation, directly fueling ATP production. It is a required substrate for sirtuins (SIRT1-7), a family of NAD+-dependent deacetylases that regulate gene expression, inflammation, stress resistance, and circadian rhythms. NAD+ is also consumed by PARP enzymes during DNA repair and by CD38 in immune signaling.

Research Context

The NAD+ decline-of-aging hypothesis has become one of the central frameworks in longevity research. Studies in model organisms have demonstrated that restoring NAD+ levels extends lifespan, improves mitochondrial function, enhances stem cell renewal, and protects against neurodegeneration. Human clinical trials with NAD+ precursors (NMN, NR) are ongoing.

Key Research Areas

Considerations for Researchers

NAD+ is available in various forms including injectable, sublingual, and IV formulations. The extreme price range ($0.01-$7.00/mg) reflects differences between bulk NAD+ powder and research-grade preparations. Stability varies by formulation. Lyophilized NAD+ should be stored at -20C protected from light and moisture.