NAD+ has become one of the most talked-about molecules in the longevity conversation, largely because of one well-documented observation: NAD+ levels change as we age. This guide explains what NAD+ is and what the science says about how it changes over time, presented carefully and factually.
For transparency: NMN and NAD+ precursors are food supplements with no authorised UK or EU health claims. This article explains the biology of NAD+ as described in scientific literature. It is not a claim that any supplement slows ageing, treats disease or produces a health benefit.
What NAD+ is
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every living cell. According to a review in Nature Reviews Molecular Cell Biology retrieved from PubMed, NAD+ is central to energy metabolism as a coenzyme for redox reactions, and it is also an essential cofactor for several other enzyme families including sirtuins, CD38 and PARPs (Covarrubias et al., 2020, DOI). In plain terms, it is a fundamental helper molecule involved in many core cellular processes.
The age-related observation
Here is the finding that drives the interest. The same review notes that ageing is accompanied by a gradual decline in tissue and cellular NAD+ levels across multiple model organisms, including rodents and humans (Covarrubias et al., 2020, DOI). This is a measured biological observation: as organisms get older, the amount of NAD+ in tissues tends to fall. It is important to be clear that this describes a natural biological pattern, not a promise that any product reverses it.
Why people look at NAD+ precursors
Because NAD+ itself is a large molecule that is not taken up well directly, scientific attention has focused on its precursors, the building blocks the body can use to make NAD+. According to a review in Cell Metabolism retrieved from PubMed, two precursors in particular, nicotinamide mononucleotide (NMN) and nicotinamide riboside (NR), have been studied extensively as NAD+ intermediates (Yoshino, Baur & Imai, 2017, DOI). This is why you see NMN and NR on supplement labels: they are the precursors the research community has examined as routes to NAD+. We explain the precursor question in what is NAD+ and why it matters and NMN vs NR.
Where the honest line is
It is essential to be straight here. The decline of NAD+ with age is well documented in the scientific literature. What is still under active investigation, and not established as an authorised health claim, is whether and how supplementing precursors translates into health outcomes in humans. The research is genuinely interesting, but it is research, and we present it as such rather than as a benefit our product delivers.
How our NAD+ support is formulated
Our NAD+ supplement provides nicotinamide riboside (NR) with quercetin and resveratrol, a precursor-based formula presented transparently on its composition. Our NMN Fusion Pro takes the NMN-precursor route. We let the composition and the science speak for themselves.
The takeaway
NAD+ is a fundamental coenzyme central to energy metabolism and many cellular processes, and scientific literature documents that tissue NAD+ levels gradually decline with age. That observation is why precursors like NMN and NR are studied so intensively. Whether supplementing them produces health benefits in humans remains under investigation, and we present this as genuine science rather than as a claim.
Sources retrieved from PubMed; see linked DOIs above. This article is for general information and science education, not medical advice. NMN and NAD+ precursors are food supplements with no authorised health claims. Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle. If you are pregnant, breastfeeding, taking medication or managing a medical condition, speak to your GP or pharmacist before starting a new supplement. Signed, Dr. Miron, Founder of Pure Vitamins UK.
