NAD+ is one of the most important molecules in the body that most people have never heard of. It powers the chemistry that turns food into usable energy, it fuels the enzymes that repair DNA and regulate aging, and its decline is now considered one of the central features of getting older. That is why restoring NAD+ has become one of the most active areas in longevity research.
What NAD+ is
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every living cell. Its core job is to shuttle electrons through the reactions that generate cellular energy, making it indispensable to metabolism. But NAD+ does more than power the engine: it is also the essential fuel for two important families of enzymes, the sirtuins and the PARPs, which between them handle much of the body’s repair and regulatory work. Without enough NAD+, those systems slow down.
What the research shows
The most compelling NAD+ research connects it to aging through the sirtuins, often called master regulators of aging. Sirtuins depend on NAD+ to function, and through that dependence NAD+ controls processes like mitochondrial biogenesis (via the AMPK-SIRT1-PGC-1α pathway), antioxidant defense, and the cellular stress responses that keep tissues healthy. SIRT3, for example, boosts the body’s antioxidant capacity and helps maintain reduced glutathione, linking NAD+ directly to oxidative protection.
The aging angle is what drives the field. Research has documented that NAD+ levels fall substantially with age, dropping by roughly half in many tissues by middle age, in part because the salvage enzyme that recycles NAD+ becomes less active over time. As NAD+ falls, sirtuin activity falls with it, which reduces mitochondrial function and antioxidant defenses. This cascade is why restoring NAD+ has become such a prominent research target for supporting energy, repair, and healthy aging.
How it works
NAD+ works as both an energy carrier and an enzyme fuel. In metabolism, it cycles between its oxidized form (NAD+) and reduced form (NADH), carrying electrons through the reactions that produce ATP, the cell’s energy currency. Separately, sirtuins consume NAD+ to remove acetyl groups from proteins, switching on programs that build mitochondria, defend against oxidative stress, and coordinate longevity pathways. PARPs use NAD+ to repair damaged DNA. Because all of these jobs draw on the same NAD+ pool, keeping that pool full is what allows the cell to produce energy, repair itself, and regulate aging at the same time.
Quick facts
| NAD+ | |
|---|---|
| Type | Essential cellular coenzyme |
| Core role | Carries electrons in energy metabolism |
| Fuels | Sirtuins (aging regulators) and PARPs (DNA repair) |
| Key pathway | AMPK-SIRT1-PGC-1α for mitochondrial biogenesis |
| Aging link | Levels fall ~50% in many tissues by middle age |
| Best known for | Energy, repair, and longevity research |
| Form | Lyophilized powder, reconstituted before use |
What to look for when buying
For a coenzyme this central, purity is what keeps the research clean. Look for a Certificate of Analysis (COA) from third-party testing and an HPLC purity figure of 99% or higher. Every batch of Marek Pharma’s NAD+ is lab-tested with a COA, lyophilized for stability, and ships from within Canada.
References
- NAD+ and sirtuins in aging and disease (review of the NAD+/sirtuin axis and age-related decline).
- Mitochondrial sirtuins, metabolism, and aging (SIRT1/SIRT3 regulation of mitochondrial function and antioxidant defense).
- The sirtuins, oxidative stress, and aging: an emerging link (Aging, on SIRT-mediated antioxidant pathways).
For laboratory and research use only.