Is NAD+ A Biohacking Target for Those Interested in Boosting Longevity?

Understandably, there is significant interest in any intervention that may deliver tangible improvements to longevity. One compound with the attention of biohackers globally is nicotinamide adenine dinucleotide, or NAD+. 

This critical coenzyme plays a vital role in cellular metabolism, particularly in processes such as energy production, DNA repair, and the regulation of oxidative stress. As we age, we know that NAD+ levels decline, a phenomenon that has been linked in research with various age-related diseases as well as reduced metabolic function. So naturally, replenishing NAD+ through supplementation has become a key point of interest for anyone seeking to improve their healthspan.

What is NAD+ and Why Is It So Important?

NAD+ (nicotinamide adenine dinucleotide) is one of the most important molecules in your body, but most people have never heard of it. It's found in every cell and is essential for keeping your body alive and functioning well. In fact, without NAD+, life as we know it would come to a grinding halt.

You can think of NAD+ as a kind of biological battery charger or molecular middleman. It helps turn the food you eat into energy, powers your cells, and even plays a major role in the capabilities of your body to repair itself and, therefore, influences how it ages over time.

But there’s much more to NAD+ than just energy.

NAD+ and Energy Production: The Basics

At its core, NAD+ is a coenzyme involved in redox reactions, meaning it helps transfer electrons during chemical reactions that are essential when it comes to creating energy.

In these reactions, NAD+ is reduced to NADH, which then donates electrons to the mitochondria (your internal cellular power plants) to drive ATP (aka energy) production.

Put simply, NAD+ is a key player in converting our food intake into actionable cellular energy. No NAD+ = no ATP = no energy = no life.

This function alone makes NAD+ essential. But what makes it especially interesting in the context of ageing and longevity is everything else it does.

NAD+ as a Signalling Molecule and Metabolic Regulator

NAD+ isn’t just about fueling metabolism; it’s also a master regulator of important enzymes and cellular stress responses. Here are the big players it interacts with:

Sirtuins – The Longevity Genes

Sirtuins are a family of NAD+-dependent enzymes that regulate everything from DNA repair to inflammation to mitochondrial health. You might hear sirtuins referred to as longevity genes because they help your cells adapt to stress and maintain function over time.

SIRT1, for example, relies on NAD+ to deacetylate (remove an acetyl group) and activate other proteins like PGC-1α (involved in the creation of new mitochondria), FOXO (involved in antioxidant defence), and p53 (a key tumour suppressor). These are all crucial for ageing gracefully and avoiding disease.

Sirtuins are of interest in longevity research for their potential to influence angiogenesis (capillary/ blood vessel formation), insulin sensitivity and other health benefits in a wide range of age-related cardiovascular and metabolic disease models. Without adequate NAD+, sirtuin activity drops, and along with it, so does your cellular resilience.

PARPs – The DNA Repair Crew

When DNA is damaged (which isn’t as extreme as it sounds; it happens daily through normal cellular processes), a family of enzymes called PARPs (poly ADP-ribose polymerases) kicks into gear to help fix it. But they use NAD+ as a raw material to do their job. If DNA damage is extensive, PARP activation can consume large amounts of NAD+, leaving less available for other systems.

This tug-of-war over NAD+ is one reason why depleted levels are linked to ageing and neurodegeneration.

CD38 – The NAD+ Drainpipe

CD38 is an enzyme that breaks down NAD+, and unfortunately, it becomes more active both with age, and in the presence of inflammation (which is also increasingly an issue as we age).

This increased CD38 expression is one of the major reasons contributing to declines in NAD+ levels as we get older.

CD38 also produces signalling molecules like cADPR that regulate calcium in the cell, important for immune function, but again, at the cost of NAD+. We know from the evidence that PARP, CD38 and sirtuins all compete for the same pool of NAD+. Targeting the inhibition of PARP or CD38 is an avenue for activating sirtuins.

Circadian Rhythms and NAD+

There’s a growing body of evidence suggesting that metabolic dysfunction is linked with disruptions to natural circadian rhythms.

Evidence also shows that NAD+ fluctuates throughout the day in a circadian pattern.

Researchers have demonstrated that supplementing with NAD+ precursors can help to influence  enzymes and genes associated with regulating the biological rhythms of the sleep-wake cycle.

This means NAD+ doesn’t just help with energy needs to survive, but it also helps our body thrive by keeping important daily biorhythms in tune.

Why NAD+ Declines With Age?

Ageing is accompanied by a gradual but consistent decline in NAD+ levels, some estimates suggest up to a 50% drop by middle age and much more in older individuals. Why?

• Increased activity of NAD+-consuming enzymes like PARPs and CD38
  
  

• Decreased production of precursors and impaired salvage pathways
  
  

• The rising burden of mitochondrial dysfunction and oxidative stress
  
  

• Chronic inflammation (aka "inflammaging")
  
  

• The cumulative impacts of poorly nourishing dietary choices and excessive stress

This NAD+ deficit contributes to the hallmarks of ageing: less energy, impaired repair capabilities, higher inflammatory burdens, and an overall increased disease risk.

Can We Replenish NAD+?

That’s the million-dollar (or billion-dollar biotech) question. And research suggests, yes, it’s possible.

Supplementing with NAD+ precursors like NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside) has been shown in animals and humans to raise NAD+ levels. These compounds enter the NAD+ salvage pathway, getting converted into NAD+ efficiently in cells.

Early human trials suggest NMN and NR are safe, well-tolerated, and biologically active. Their effects are being investigated for everything from metabolic syndrome and muscle loss to cognitive decline and cardiovascular health.

Lifestyle strategies like caloric restriction, exercise, and intermittent fasting can also boost NAD+ naturally by activating AMPK and sirtuins, further reinforcing its role as a longevity target.

The Naturopathic Perspective

NAD+ is far more than an energy coenzyme. It’s a critical regulator of your cell's survival machinery, repair systems, and stress response. As science uncovers more about how its depletion drives aging, and how boosting it may slow or reverse aspects of decline, NAD+ has earned its place as a true biohacking target.

Whether through precursors like NMN and NR, or lifestyle interventions, keeping NAD+ levels supported could be one of the most promising strategies in the longevity toolbox.

References

Mehmel M, et al. Nicotinamide Riboside-The Current State of Research and Therapeutic Uses. Nutrients. 2020 May 31;12(6):1616.

Levine D, et al. NAD+ Controls Circadian Reprogramming through PER2 Nuclear Translocation to Counter Aging. Molecular Cell. 2020 June 4;78(5):835-849. 

Imai S, et al. NAD+ and sirtuins in aging and disease. Trends Cell Biol. 2014 Aug;24(8):464-71.

Kane AE, et al. Sirtuins and NAD+ in the Development and Treatment of Metabolic and Cardiovascular Diseases. Circ Res. 2018 Sep 14;123(7):868-885. 

Das, A. et al. Impairment of an endothelial NAD+-H2S signaling network is a reversible cause of vascular aging. Cell 2018;173(1):74-89.e20. 

Camacho-Pereira J, et al. CD38 Dictates Age-Related NAD Decline and Mitochondrial Dysfunction through an SIRT3-Dependent Mechanism. Cell Metab. 2016 Jun 14;23(6):1127-1139. 

Hope HC, et al. Age-associated nicotinamide adenine dinucleotide decline drives CAR-T cell failure. Nat Cancer. 2025;6:1524–1536.

Shade C. The Science Behind NMN-A Stable, Reliable NAD+Activator and Anti-Aging Molecule. Integr Med (Encinitas). 2020 Feb;19(1):12-14.

Yoshino M, et al. Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women. Science. 2021 Jun 11;372(6547):1224-1229.

Yoshino J, et al. NAD+ Intermediates: The Biology and Therapeutic Potential of NMN and NR. Cell Metab. 2018 Mar 6;27(3):513-528

Trammell SA, et al. Nicotinamide riboside is uniquely and orally bioavailable in mice and humans. Nat Commun. 2016 Oct 10;7:12948.