Urolithin A
Urolithin A (Mitopure), Pomegranate-Derived Mitophagy Activator for Muscle Aging
Evidence grade 3 of 5, Mixed. Read how the Atlas grades evidence.
The written rationale for this grade is still being prepared.
- FDA
- Not FDA approved as a drug; FDA GRAS-notified as a food ingredient (Mitopure)
Reference only. Not medical advice.
What can go wrong
Safety in trials has been favorable, with no serious adverse events reported at studied doses (typically 500-1,000 mg/day). Long-term data are still accumulating, and effects in already-athletic young men are unproven. As a food-ingredient postbiotic it lacks the hormonal risks of testosterone products, but claims of broad anti-aging benefit outrun the muscle-specific evidence.
This is something to take to a clinician. The Atlas can tell you what is known about urolithin a in general. It cannot tell you what is happening in your body, and the difference matters most for exactly the symptoms that bring people to this page.
Urolithin A is a gut-microbiome metabolite of ellagitannins from pomegranate, berries, and walnuts that activates mitophagy, the recycling of damaged mitochondria. Because only about 40% of people harbor the gut bacteria to produce it from food, it is sold as a stabilized synthetic ingredient (Mitopure) by Amazentis/Timeline. Singh et al. (2022, Cell Reports Medicine) reported that direct supplementation improved muscle strength (~12%), endurance, and mitochondrial biomarkers in middle-aged adults versus placebo. It is not a testosterone or sexual-function product per se, but it is heavily marketed to aging men for muscle and 'cellular energy.'
The mitophagy compound with real muscle-strength RCT data, sold direct by its own patent-holder.
What people take it for
These are the reasons people give for taking it. They are not effects it has been shown to have.
How it is supposed to work
Urolithin A induces mitophagy, clearing dysfunctional mitochondria and improving mitochondrial quality and efficiency in muscle. Trials link it to lower plasma acylcarnitines and C-reactive protein (markers of improved mitochondrial function and reduced inflammation) and to gains in muscle strength and aerobic endurance, positioning it as a muscle-aging rather than hormonal intervention.
Real mechanism, modest effect, single-company evidence base
The mitophagy mechanism is well characterized and the RCT data are genuine, which sets urolithin A apart from most supplements here. Two caveats: the human effects (a roughly 12% strength change and endurance improvements) are real but modest and shown mainly in middle-aged/older or lower-fitness cohorts, and most of the pivotal research is funded and conducted by or with Amazentis, the ingredient's patent holder, so independent replication is still limited.
What people get wrong
Often saidUrolithin A boosts testosterone
ActuallyIt targets mitochondrial quality and muscle function, not androgens; there is no testosterone-boosting claim in the trial data.
Often saidEating pomegranate delivers the same effect
ActuallyOnly about 40% of people have the gut bacteria to convert ellagitannins to urolithin A, which is the rationale for supplementing the finished metabolite.
Who profits, and who pushes back
Nobody is named here yet, because we have not done that work on this entry. Read that as unfinished. Somebody almost certainly sells this, and somebody almost certainly disputes it. Assume both until we have checked.
Set against the alternatives
Unlike the testosterone-booster botanicals in this category, urolithin A does not touch hormones; its closest peers are creatine and exercise for muscle preservation. Its evidence quality is higher than most supplements here, but tempered by sponsor involvement and modest effect sizes.
What we do not know
- Do the benefits replicate in independent, non-company-funded trials?
- Is there any effect in fit young men?
- What are the long-term (multi-year) effects?
The market for this
What follows describes how this is bought and sold. It is not a buying guide and it is not an endorsement of any seller.
Consumer products should use the standardized synthetic Mitopure ingredient, not raw pomegranate extract, because dietary ellagitannins do not reliably yield urolithin A in non-producers. Generic 'urolithin A' products of uncertain purity and content have appeared; third-party verification is advisable.
At a glance
- Source
- Gut metabolite of pomegranate/walnut ellagitannins
- Producers
- ~40% of people make it from food; hence direct supplementation
- Marquee RCT
- Singh 2022, Cell Reports Medicine (~12% strength gain)
What this entry does not yet cover
What follows is unfinished work on our side, not a finding about Urolithin A. A short entry is not a safe entry.
- Timeline. We have not built the dated record of research and regulatory events.
- Cost and market. We have not documented what it sells for or who sells it.
- Supply chain. We have not mapped where it is made.
- Who uses it. We have not documented the user groups.
- What could change. No forward-looking summary yet.
- Children and teenagers. We have not checked what is known about younger people.
- Where we land. We have not taken a position on this yet.
Sources
The studies below are named and described, but not linked. You cannot open them from here and check our reading against them, which means this page is our summary of the literature rather than a document you can verify. Weigh it accordingly until the links exist.
The studies that matter
Singh et al., Cell Reports Medicine (RCT, middle-aged adults)2022
Improved muscle strength (~12%), aerobic endurance, and mitochondrial biomarkers vs placebo
Andreux et al., Nature Metabolism (first-in-human)2019
Safe; dose-dependent improvement in mitochondrial gene-expression biomarkers
Liu et al., JAMA Network Open (older adults)2022
Improved muscle endurance and inflammation markers