NAD+ supplements have become one of the biggest talking points in the healthy-ageing supplement market. You may have seen products containing NAD+ itself, NMN or NR, often accompanied by claims about energy, cellular health and longevity.
But what actually is NAD+? What is the difference between NAD+, NMN and NR? And if your aim is to increase NAD+ levels, which form makes the most sense?
The answer is a little more complicated than simply picking the supplement with “NAD+” written on the front of the bottle.
What is NAD+?
NAD+ stands for nicotinamide adenine dinucleotide.
It is a molecule found naturally throughout the body and is involved in a huge number of cellular processes. In particular, NAD+ acts as a coenzyme in reactions involved in cellular metabolism and energy production.
It is also used by enzymes including sirtuins and PARPs, which are involved in processes such as cellular signalling and DNA repair.
This is one reason NAD+ has attracted so much interest in ageing research.
Studies in animals have consistently found changes in NAD+ metabolism with age. There is also evidence of age-related reductions in NAD+ in some human tissues, although the picture in humans is more complicated than is sometimes suggested online. A 2025 review in Nature Metabolism noted that evidence for a consistent age-related decline across human tissues is still relatively limited.
So while NAD+ is unquestionably important to normal human biology, the idea that simply increasing NAD+ will slow or reverse human ageing remains unproven.
If we need NAD+, why not just take NAD+?
This is where NAD+ supplements can become confusing.
The body does not rely solely on obtaining NAD+ directly. Instead, it can manufacture NAD+ from a number of precursor compounds.
Two of the most talked-about are:
NMN – nicotinamide mononucleotide
and
NR – nicotinamide riboside
Both can ultimately be converted into NAD+ within the body.
Rather than supplying the final NAD+ molecule, the idea behind NMN and NR supplementation is therefore to give the body additional raw material from which it can produce NAD+.
There is now considerably more human research examining oral NR and NMN as NAD+ precursors than there is supporting most of the claims made around simply taking oral NAD+ itself.
NAD+ vs NMN vs NR at a glance
| NAD+ | NMN | NR | |
|---|---|---|---|
| Full name | Nicotinamide adenine dinucleotide | Nicotinamide mononucleotide | Nicotinamide riboside |
| What is it? | The NAD+ molecule itself | NAD+ precursor | NAD+ precursor |
| Can the body use it to increase NAD+? | NAD+ is the end product | Yes | Yes |
| Human research | Less established for oral supplementation | Growing | Relatively well established |
| Evidence it increases NAD+ biomarkers | Less clear orally | Yes | Yes |
| GB supplement regulatory position | Depends on the specific ingredient/product | β-NMN currently has an application in progress | Nicotinamide riboside chloride is authorised under specified conditions |
| Evidence of anti-ageing benefits in humans | Not established | Not established | Not established |
What is NMN?
Nicotinamide mononucleotide (NMN) is a naturally occurring molecule that acts as a precursor to NAD+.
Interest in NMN originally grew largely from animal research, where increasing NAD+ availability produced some impressive results in models of ageing and metabolic dysfunction.
That inevitably led to NMN becoming heavily promoted as an “anti-ageing” supplement.
Human research has since started to catch up.
Clinical trials show that oral NMN can increase NAD-related biomarkers in humans. For example, a randomised placebo-controlled study in healthy adults found that NMN supplementation significantly increased blood NAD+ concentrations.
More recently, a 2026 human study directly comparing different NAD+ precursors found that both NMN and NR produced comparable increases in circulating NAD+ after 14 days.
So there is reasonable evidence that NMN can do what it is supposed to do at the first stage: increase NAD+ availability.
That does not necessarily mean all of the claimed benefits of NMN have been proven.
Does NMN have proven anti-ageing benefits?
Not yet.
This is an important distinction.
Increasing a biomarker associated with ageing is not the same thing as demonstrating that a supplement slows ageing, extends human lifespan or prevents age-related disease.
A 2026 systematic review and meta-analysis looked at 15 randomised trials of NMN or NMN-related supplementation. Short-term supplementation appeared generally well tolerated, but researchers found no significant overall improvements in body weight, BMI, fasting glucose, HbA1c, cholesterol or systolic blood pressure.
That doesn't mean NMN has no potential. It means the human evidence has not yet caught up with some of the much stronger claims made about it.
What is NR?
Nicotinamide riboside (NR) is another precursor used by the body to manufacture NAD+.
NR has been studied in humans for longer than NMN and has a relatively substantial body of human research behind its ability to raise NAD+.
Human studies have repeatedly shown increases in blood NAD+ following NR supplementation. One study reported approximately a doubling of circulating NAD+ following supplementation, while other trials have also demonstrated substantial increases.
Researchers have even begun examining whether this translates beyond the bloodstream.
A small 2024 study using magnetic resonance spectroscopy found increased NAD+ concentrations in the brain following NR supplementation, while a 2026 pharmacokinetic study found gradual increases in both blood and brain NAD following sustained supplementation with NAD+ precursors.
Once again, however, raising NAD+ and producing a meaningful health benefit are two different questions.
Is NR better than NMN?
Based purely on their ability to raise NAD+, there may actually be less difference between NR and NMN than some supplement marketing suggests.
A particularly useful 2026 study compared NR, NMN and nicotinamide directly in 65 healthy adults. After 14 days, both NR and NMN comparably increased circulating NAD+ concentrations, while nicotinamide did not produce the same response.
Research therefore currently supports both NR and NMN as genuine NAD+ precursors.
There isn't strong evidence showing that NMN is universally superior to NR, or vice versa, in terms of meaningful health outcomes.
Do NAD+ boosters actually make you feel different?
Possibly, but this is where expectations need to be realistic.
NR and NMN can raise NAD+ biomarkers. That is increasingly well established.
Whether a healthy person will actually notice more energy, improved exercise performance, better cognition or some other obvious effect is much less certain.
A major 2026 systematic review examined 33 human intervention studies alongside the much larger body of animal research.
The overall conclusion was essentially that NAD+ precursors reliably affect NAD-related biomarkers, but results for clinically meaningful outcomes in humans remain inconsistent. The dramatic effects sometimes seen in animal studies have not been consistently reproduced in people.
That is probably the most accurate way to view the category at the moment.
The science is genuinely interesting. But NAD+ supplements are not currently proven anti-ageing treatments.
Are NMN and NR safe?
The human trials conducted so far suggest that both NMN and NR are generally well tolerated over the periods and doses studied.
A 2026 review of NMN trials involving doses ranging from 250mg to 2,000mg per day for between two weeks and 24 weeks found no clear increase in overall adverse events or serious adverse events compared with controls.
That should not be interpreted as proof of lifelong safety. NAD+ supplementation is still a relatively young area of research, and there is much less evidence regarding very long-term supplementation.
Research doses also should not automatically be interpreted as recommended supplement doses, particularly where UK regulations specify maximum permitted amounts for particular ingredients.
Anyone who is pregnant, breastfeeding, taking medication or being treated for a medical condition should discuss supplementation with an appropriate healthcare professional.
So which is better: NAD+, NMN or NR?
If the goal is specifically to increase NAD+ availability, the current evidence makes NR and NMN more interesting than simply looking for a product labelled “NAD+.”
Both NMN and NR have demonstrated the ability to increase NAD+ biomarkers in human studies, and recent head-to-head research suggests their effect on circulating NAD+ may be quite similar.
However, for consumers in Great Britain there is an additional consideration.
Nicotinamide riboside chloride currently has established novel-food authorisation, whereas β-NMN remains under assessment.
That means that, at present, NR arguably offers the best combination of human evidence, ability to raise NAD+ and regulatory clarity for the UK market.
What we would not conclude is that NR, NMN or NAD+ has been proven to slow human ageing.
Research into NAD+ metabolism is developing rapidly, and the next few years should give us a much better idea of whether increasing NAD+ produces meaningful benefits beyond simply increasing a laboratory measurement.
For now, it is a promising and scientifically interesting area of supplementation – but one where separating the evidence from the marketing hype is particularly important.
NAD+ and NMN supplements at The Supplement Store
If you are interested in exploring the different approaches discussed above, we currently list products representing both direct NAD+ supplementation and the NMN precursor route.
PER4M NMN
PER4M NMN provides 1,000mg of nicotinamide mononucleotide per serving in a convenient capsule format.
NMN is a precursor that the body can use within its NAD+ production pathways, making this the more direct example of the NMN approach discussed throughout this guide.
Applied Nutrition NAD+ Resveratrol
Applied Nutrition NAD+ Resveratrol takes a different approach, combining NAD+ itself with trans-resveratrol and vitamin C in a two-capsule daily serving.
Resveratrol is a naturally occurring plant polyphenol frequently associated with healthy-ageing research, while vitamin C contributes to normal energy-yielding metabolism and the protection of cells from oxidative stress.
Shop Applied Nutrition NAD+ Resveratrol
As with all supplements in this category, it is worth keeping expectations realistic. Research into NAD+, NMN and other NAD+ precursors is developing quickly, but they should not be viewed as proven treatments for ageing or age-related disease.
Information in this article is provided for general educational purposes and should not be considered medical advice.
