Medically reviewed by Dr Zeeshan Afzal (MBBS, General Practitioner) — Medical Content Reviewer, Welzo.
Written by: The Welzo Longevity Editorial Team | Last updated: July 2026
Declared interest: Welzo sells both compounds — NMN Pro 1000 and Ultra Purity Urolithin A 500mg. We have no commercial reason to favour either, which is unusual for a comparison of this kind. Most detailed comparisons online are published by a company selling one of them; we flag those where relevant. See our editorial policy.
These are the two most-searched compounds in the longevity supplement category, and the comparison is usually presented as a contest with a winner.
It is not. They act on different parts of mitochondrial biology, they have been tested against different endpoints in different populations, and — the fact that should frame everything else — no trial has ever compared them directly in humans.
If you are building a routine rather than choosing between two products, our longevity supplements guide ranks the whole category on evidence, and the longevity stack guide covers where either belongs.
For the underlying science on NAD⁺, see NMN benefits, side effects and dosage, the NMN supplements range and NMN Pro 1000. For the wider category, browse anti-ageing and longevity supplements.
The short answer
Urolithin A has the better functional evidence; NMN has the more independent evidence and costs less. Urolithin A trials measured muscle strength and endurance directly and found improvements [1,2] — though the largest missed its primary endpoint [2] and most research is manufacturer-funded. NMN reliably raises blood NAD⁺ and has shown benefits for physical function, drowsiness and sleep quality [3,4], but a meta-analysis of eight RCTs found no metabolic benefit [5]. They target different pathways and are considered complementary rather than competing. Neither has lifespan evidence. Both belong late in a stack, after vitamin D, omega-3, magnesium and creatine.
Table of contents
There has never been a randomised controlled trial giving one group urolithin A, another group NMN, and comparing outcomes.
That means every "which is better" comparison — including this one — is assembled from separate trials with different participants, different ages, different doses, different durations, different endpoints and different funders. Comparing across studies like that is legitimate for orientation and unreliable for ranking.
Worth knowing before you read anyone else's verdict. The most detailed and confident urolithin A versus NMN comparisons circulating online are published by Timeline, the consumer brand of Amazentis — the company that manufactures the branded Mitopure form of urolithin A and funded much of its research [6,7].
Their material makes claims such as urolithin A being a safer alternative to NAD⁺ precursors and the research on urolithin A being more compelling than the alternatives [6,7]. Those are the assertions of a company selling one side of the comparison.
We are not saying they are wrong. We are saying that a retailer selling both compounds is, unusually, in a better position to give you a straight answer than either manufacturer.
It is worth understanding why, because it tells you something about how this field works.
Head-to-head trials are expensive, and nobody has an incentive to fund one. A manufacturer running a comparison risks discovering their compound loses. Neither compound is patentable in a way that would justify a large trial budget. And academic funders generally prioritise disease treatment over comparing two consumer supplements.
So the comparison you actually want — same participants, same duration, same endpoints, independent funding — is unlikely to be run in the foreseeable future. The evidence gap here is structural rather than temporary, and any article implying it will soon be resolved is guessing.
Treat everything below as orientation rather than a verdict. Where one compound has been tested against an endpoint and the other has not, that is a difference in what was studied — not proof that one works and the other does not. Absence of evidence and evidence of absence are different things, and this comparison contains a great deal of the former.
This is the part most comparisons get right and then immediately forget when declaring a winner.
| Urolithin A | NMN | |
|---|---|---|
| What it is | A postbiotic — a gut-bacterial metabolite of ellagitannins from pomegranate, walnuts and berries | A direct precursor to NAD⁺, a coenzyme central to energy metabolism |
| Mechanism | Activates mitophagy — the recycling of damaged mitochondria [1,2] | Raises cellular NAD⁺, supporting energy production and sirtuin activity [3,4] |
| Stage of mitochondrial biology | Quality control and renewal | Fuel and enzymatic cofactor supply |
| Dietary source | Indirect, via gut conversion — only ~40% convert efficiently [8] | Trace amounts in some foods; not a practical dietary route |
| Interaction between them | None known; generally regarded as complementary rather than competing [9] | |
An analogy that holds reasonably well: NMN supplies fuel and machinery to the power plant, while urolithin A helps decommission the worn-out generators so new ones can be built. Those are not alternatives to one another. They are different jobs.
Both mechanisms are genuinely well characterised, and that is exactly why they are worth handling carefully. A clear mechanism is the most persuasive thing a supplement can have and among the least predictive of whether it works.
Across this series we have repeatedly found compounds with excellent mechanisms and disappointing outcomes — resveratrol and sirtuin activation being the clearest case [14]. NMN raises NAD⁺ exactly as advertised and still showed no metabolic benefit across eight randomised trials [5]. Urolithin A activates mitophagy exactly as advertised and still missed its primary endpoint in its largest trial [2].
The mechanisms are real. They are simply not the evidence, and a comparison of mechanisms is not a comparison of results.
| Criterion | Urolithin A | NMN |
|---|---|---|
| Functional endpoints measured | Muscle strength, endurance, 6-minute walk [1,2] | Sit-to-stand, walking speed, drowsiness, sleep [3,4] |
| Biomarker reliability | Mitochondrial health markers [1,10] | NAD⁺ elevation — very consistent [4] |
| Notable failure | Primary endpoint missed in largest trial [2] | No metabolic benefit across 8 RCTs [5] |
| Evidence independence | Concentrated in manufacturer-affiliated research | More varied research groups |
| Sleep signal | Not a studied endpoint | Improved sleep quality and reduced drowsiness [3,4] |
| Lifespan evidence in humans | None. No supplement has this. | |
This favours urolithin A, and we say so despite selling both.
Urolithin A products at 500 mg match the lower dose that produced results in ATLAS [2], and the 1,000 mg dose used in the older-adult trial [1] is also commercially available. The market and the evidence line up.
NMN is different. The trials that produced the most encouraging functional results used 250 mg per day [3,4]. Most products, including our own NMN Pro 1000, supply 1,000 mg — four times the studied amount — and the meta-analysis covering 250 to 2,000 mg found no metabolic benefit across that entire range [5], which is not the pattern you would expect if more were straightforwardly better.
Practical consequence: if you buy NMN, dosing at 250–500 mg is defensible on the evidence and halves or quarters your cost per month. We set this out in more detail in is NMN a scam? and NMN dosage by age.
| NMN Pro 1000 | Ultra Purity Urolithin A | |
|---|---|---|
| Price | From £26.99 (was £39.99) | £34.99 (was £49.99) |
| Per serving | 1,000 mg (2 capsules) | 500 mg (2 capsules) |
| Servings per bottle | 30 | 30 |
| Cost per day | ~£0.90 | ~£1.17 |
| Cost at the studied dose | ~£0.23/day at 250 mg | ~£1.17/day at 500 mg |
| Annual cost | ~£324 at label dose | ~£420 |
Read the fifth row carefully. Dosed at the amount used in the positive trials, NMN becomes dramatically cheaper — roughly a fifth of urolithin A's daily cost. Whether you consider that a fair comparison depends on whether you believe 1,000 mg does more than 250 mg, and the evidence does not currently say it does.
Full category pricing is in how much a longevity stack actually costs.
Researchers at the National University of Singapore tested commercial NMN and urolithin A supplements against their label claims [11].
Urolithin A performed materially better. But a near-30% overage is still a wide margin on an expensive ingredient, and "better than the worst category in the industry" is a low bar. Whichever you choose, a batch-specific certificate of analysis for the finished product is the check that matters — see how to read a certificate of analysis and third-party testing: what it means and what it doesn't.
Yes, and there is a coherent rationale for it. They act on different stages of mitochondrial biology, there is no known interaction, and they are generally regarded as complementary [9].
Two honest caveats. First, no trial has tested the combination in humans, so any additive benefit is a hypothesis rather than a finding. Second, running both costs roughly £62 a month at label doses — which puts you firmly in the upper tiers described in our cost guide, and is a lot of money for two compounds that both lack outcome data.
If you do take both, introduce one at a time with several weeks between, so that any effect or side effect can be attributed. See how to start longevity supplements and can you take supplements together.
| Your priority | Our read |
|---|---|
| Muscle strength and physical performance | Urolithin A. Directly measured in randomised trials in two age groups [1,2] |
| Energy, sleep quality, daytime drowsiness | NMN. The only one of the two with a sleep and drowsiness signal [3,4] |
| Lowest cost | NMN, especially dosed at the studied 250 mg [3,4] |
| Most independent evidence base | NMN. Urolithin A research is concentrated in manufacturer-affiliated work |
| You eat lots of pomegranate and walnuts with no effect | Urolithin A — you may be among the ~60% who convert poorly [8] |
| Aged 65+, concerned about frailty | Urolithin A has the more directly relevant trial [1] |
| You have not yet covered the basics | Neither. Vitamin D, omega-3, magnesium and creatine first [12,13] |
Given that no head-to-head data exists, the sensible approach is to run your own sequence rather than agonise over the comparison:
That sequence costs one compound's worth of money and produces actual information about your own response — which is more than any cross-trial comparison, including this one, can give you.
The similarities matter more than the differences for most buyers.
Deeper reading on each: urolithin A benefits, dosage and UK buying guide and our NAD supplement guide. For comparisons with other options: NMN vs creatine, spermidine vs NMN and ergothioneine.
Speak to your GP or pharmacist before starting either compound if you take prescription medication, have an existing medical condition, or are pregnant, breastfeeding or trying to conceive. Neither has been studied in pregnancy or in children, and neither is suitable for those groups.
If your reason for considering either is fatigue, muscle weakness or unexplained decline, get that investigated first. Iron deficiency, thyroid dysfunction, vitamin D deficiency, B12 deficiency and sarcopenia are common, treatable, and unresponsive to either compound. A tiredness and fatigue blood test, vitamin D blood test, thyroid blood test or Full Body MOT Health Check is a better first purchase than either supplement.
No trial has compared them directly, so any confident answer is extrapolation. Urolithin A has stronger evidence on directly measured muscle strength and endurance [1,2]; NMN has more independent research, a reliable NAD⁺ biomarker effect, a sleep and drowsiness signal, and a lower price [3,4]. They act on different mechanisms and are considered complementary rather than competing [9].
Urolithin A is a postbiotic produced by gut bacteria from compounds in pomegranate, walnuts and berries, and it activates mitophagy — the recycling of damaged mitochondria [1,2]. NMN is a precursor to NAD⁺, a coenzyme central to energy metabolism and sirtuin activity [3,4]. One works on mitochondrial quality control; the other on mitochondrial fuel supply.
There is no known interaction and they are generally regarded as complementary because they target different stages of mitochondrial biology [9]. However, no human trial has tested the combination, so any additive benefit is hypothetical. It also costs around £62 a month at label doses. Introduce one at a time so you can attribute any effect.
NMN. At Welzo, NMN Pro 1000 is from £26.99 for 30 servings (~£0.90/day) against £34.99 for Ultra Purity Urolithin A (~£1.17/day). The gap widens considerably if you dose NMN at the 250 mg used in the positive trials, which brings it to roughly £0.23 a day [3,4].
Urolithin A, on independent testing. Researchers found NMN products deviating from label claim by between −100% and +11.2%, with several containing no detectable NMN, while urolithin A products deviated by −15.5% to +28.6% with none found empty [11]. Neither is reliable without a batch-specific certificate of analysis.
Urolithin A has the more direct evidence — trials measured muscle strength and endurance and found improvements in both older and middle-aged adults [1,2]. That said, creatine monohydrate has a vastly larger and more independent evidence base for muscle outcomes at a fraction of the price [13], and should come first for most people.
NMN, on current evidence. Two randomised trials found improvements in sleep quality and reduced daytime drowsiness at 250 mg/day over 12 weeks [3,4]. Urolithin A has not targeted sleep as an endpoint, so there is nothing to compare against rather than a negative finding.
No. Neither has human lifespan evidence, and no trial capable of demonstrating it exists for any supplement. Claims of lifespan extension are extrapolations from animal work, which translates poorly. Both are best understood as speculative purchases with some functional data behind them.
Read them, but weight them. The most detailed urolithin A versus NMN comparisons online are published by the company that manufactures the branded urolithin A used in most of its research and funded much of that research [6,7]. Welzo sells both compounds, which is why we have tried to give a straight account of where each one wins.
Honestly, neither — until vitamin D, omega-3, magnesium and creatine are covered, since those have substantially stronger evidence at a fraction of the cost [12,13]. If those are in place and you must pick one, choose by goal: urolithin A for muscle function, NMN for sleep, drowsiness and lower cost.
Medical disclaimer
This article is for general information and does not constitute medical advice, diagnosis or treatment. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle, and should not be used to treat or prevent disease. No supplement has been shown to extend human lifespan. No randomised trial has directly compared urolithin A with NMN, so all comparisons here are drawn across separate studies with different populations, doses and endpoints. Neither compound has been studied in pregnancy, breastfeeding or children and neither is recommended for those groups. Always consult a qualified healthcare professional before starting any new supplement, particularly if you take prescription medication or have an existing medical condition. Persistent fatigue, muscle weakness or unexplained decline warrants clinical assessment rather than self-supplementation. Reviewed for medical accuracy by Dr Zeeshan Afzal. See the full Welzo medical disclaimer.
All product photography in this article is owned by Welzo and served from the Welzo media library. Prices correct at the time of publication and subject to change.
Hodnoceno výborně o 26,523+ recenzí
100% záruka vrácení peněz
Naše záruka vrácení peněz zajišťuje, že obdržíte své položky nebo získáte plnou náhradu.
