NAD+: the science of a cellular energy coenzyme
NAD+ is a coenzyme found in every cell, central to how your body turns food into energy and runs cellular repair. Its levels tend to decline with age, which is why it has become a focus of longevity research. This guide gives an honest picture of what NAD+ is, why it matters, what the science does and does not yet show, and how a provider approaches it.
What is NAD+?
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme present in all living cells. It is a workhorse of energy metabolism, shuttling electrons in the reactions that produce cellular energy, and it is also used by enzymes involved in DNA repair and cellular signaling.
Research in preclinical models shows NAD+ levels decline with age, and that decline is associated with reduced mitochondrial function. This is the basis for interest in restoring NAD+, either directly or through precursors such as nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN).
At Expert Health, NAD+ and its precursors are used under the guidance of a US-licensed provider. These are not FDA-approved treatments for any disease, and content here is educational, not medical advice. See the disclaimer below.
How NAD+ works in the body
NAD+ cycles between two forms to carry electrons through the reactions that generate energy in your mitochondria. It is also the fuel for enzymes called sirtuins and PARPs, which are involved in cellular stress responses and DNA repair.
- Powers energy production as a core carrier in cellular metabolism.
- Supports repair and signaling through sirtuin and PARP enzymes.
- Declines with age in preclinical models, which is the rationale for restoring it.
What the research shows, and the many unknowns
The biology of NAD+ is well established, and human studies show that precursors like nicotinamide riboside can safely and measurably raise the NAD+ metabolome, including in aged skeletal muscle. That part is real.
What is still unsettled is how reliably raising NAD+ translates into the bigger outcomes people care about, like energy, healthy aging, and longevity, in humans. A 2023 review in Endocrine Reviews captured it well with its title, "potential applications and many unknowns." We think the honest framing is that the rationale and the safety signal are encouraging, while broad benefit claims are not yet settled science. That is exactly why provider guidance matters.
Who it's for
NAD+ support is for adults interested in energy and healthy aging who want to explore it under medical guidance rather than self-experimenting with unregulated products. A provider reviews your history and goals and sets an approach that fits.
Safety and side effects
NAD+ and its precursors are generally well tolerated in studies. Rapid intravenous administration can cause flushing, nausea, or chest tightness, which is why pacing and provider oversight matter. As with any therapy, it is not right for everyone, and a provider screens for that.
Frequently asked questions
What is the difference between NAD+, NMN, and NR?
Does NAD+ reverse aging?
How is NAD+ given?
Is NAD+ FDA approved?
Sources
- Nicotinamide Adenine Dinucleotide in Aging Biology: Potential Applications and Many Unknowns · Endocrine Reviews, 2023
- Elhassan YS, et al. Nicotinamide Riboside Augments the Aged Human Skeletal Muscle NAD+ Metabolome · National Library of Medicine (PubMed)
- Nicotinamide Riboside, a Promising Vitamin B3 Derivative for Healthy Aging and Longevity · PMC / National Library of Medicine
This article is for educational purposes and is not medical advice. Statements have not been evaluated by the FDA, and this treatment is not intended to diagnose, treat, cure, or prevent any disease. Compounded medications are not FDA-approved. Individual results vary. Always consult a licensed provider before starting any treatment.
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