When it comes to NAD+ (nicotinamide adenine dinucleotide, CAS No. 53-84-9), you may have heard it linked to "cellular vitality". But it is not some "viral ingredient"—instead, it is a "long-standing acquaintance" in cellular physiology. Recent studies have uncovered new associations between NAD+ and healthspan.

As we age, the NAD+ levels in our cells gradually decline—and this is no trivial matter. A 2023 study published in the journal Nutrients (by Sharma et al.) clearly points out that this decline is correlated with "hallmarks of aging", which in turn increases the risks of metabolic disorders, cardiovascular issues, and neurodegeneration, making it a major "obstacle" to healthspan.

So how can we help cells "maintain" stable NAD+ levels? This study offers a new insight: instead of relying solely on NAD+ precursors (such as NMN and NR) for supplementation, try "synergistic supplementation"—combining these precursors with other anti-aging substances. This approach not only helps cells restore NAD+ levels to those of youth, but also allows the health benefits of both parties to "stack". The study also elaborates on the key underlying mechanism: for instance, inhibiting the activity of CD38 enzyme can reduce the degradation and consumption of NAD+. Meanwhile, these synergistic substances can support the function of SIRT1 (a core member of the sirtuin family)—and the activity of SIRT1 is entirely dependent on NAD+. The regulatory framework of the "CD38/NAD+/SIRT1 axis" is precisely the core reason why these substances can enhance the efficacy of NAD+ supplementation.

In fact, the "primary functions" of NAD+ have long been confirmed: it is the core carrier for mitochondrial energy supply (transporting 95% of the energy required by the human body) and also a "logistics supporter" for DNA repair (when cellular DNA is damaged, nearly 90% of intracellular NAD+ is consumed to initiate the repair process). The value of this study lies in establishing a closer connection between the basic functions of NAD+ and "healthspan regulation".

Of course, NAD+ is not a "miracle cure". This study outlines a "scientific strategic framework": maintaining reasonable NAD+ levels through synergistic regulation, thereby reducing the risk of age-related diseases. It is more like a "key node" in the cellular health network, and studying it is essentially a way to find a "rational approach" to extending healthspan.