Also known as: UA, Mitopure, Ellagitannin metabolite, Pomegranate metabolite
Muscle & RecoveryGood evidence
A postbiotic produced when gut bacteria convert ellagitannins from pomegranate and walnuts, studied for its effect on mitophagy. Only a minority of people produce it efficiently themselves, which is the strongest argument for supplementing it.
Typical dose
500.0–1000.0 mg per day
Once daily with food
What it is
Urolithin A is not present in food. It is a postbiotic, produced when gut bacteria metabolise ellagitannins and ellagic acid found in pomegranate, walnuts, strawberries and raspberries.
The crucial detail is that this conversion depends on having the right gut bacteria, and most people do not. Estimates suggest something in the region of a third or fewer of adults produce meaningful amounts, meaning that for the majority, eating pomegranate does not deliver urolithin A at all.
This is an unusually strong rationale for direct supplementation. Rather than topping up something the body already makes, it supplies a compound most people cannot produce, which distinguishes it from most ingredients marketed on similar longevity grounds.
How it works
The primary mechanism is induction of mitophagy, the selective clearance of damaged mitochondria. Mitochondrial quality control declines with age, and accumulation of dysfunctional mitochondria contributes to reduced cellular energy output, particularly in muscle.
By promoting clearance of damaged mitochondria, urolithin A supports renewal of the mitochondrial pool, which in preclinical models translates into improved muscle function and endurance.
This is a distinct mechanism from NAD+ precursors, which address coenzyme availability rather than organelle quality. The two are sometimes marketed as interchangeable longevity compounds; mechanistically they are not.
What the evidence shows
Human evidence is better than for most compounds in the longevity category. Randomised controlled trials in older adults have reported improvements in muscle endurance measures and favourable changes in mitochondrial gene expression and plasma biomarkers.
A trial in middle-aged adults reported improvements in muscle strength and in markers of mitochondrial function over four months. Safety and tolerability have been examined in dedicated trials with good results.
The caveats are real: much of the research is linked to the company that developed the branded ingredient, sample sizes are modest, and effects on functional outcomes, while statistically detectable, are moderate rather than dramatic. Independent replication is still limited. But this is genuine human trial evidence, which puts it ahead of most of its category.
Dosing
Human trials have generally used 500-1,000 mg daily, with 500 mg the most common dose and 1,000 mg used where greater effect was sought. Effects on biomarkers appeared at both.
Taken once daily with food. Trial durations were typically four months, and functional improvements emerged over that timescale rather than quickly.
Pomegranate juice or extract is not a substitute unless you happen to be one of the minority who converts efficiently, and there is no easy way to know which group you are in without testing. That uncertainty is precisely the argument for taking the metabolite directly.
At a glance
Common forms
Urolithin A (Mitopure), Generic urolithin A, Capsules, Powder sachets
Half-life / duration
Plasma levels peak within hours; functional effects accrue over months
Timing
Once daily with food
Competition status
Permitted — not on the WADA Prohibited List
Category
Muscle & Recovery
Safety and side effects
Dedicated safety trials have reported urolithin A as well tolerated at doses up to 1,000 mg daily over four months, with no clinically significant adverse findings on blood chemistry or other markers.
Reported effects are mild and infrequent, generally digestive. It has been through formal safety assessment in some jurisdictions, which is more than can be said for many ingredients marketed alongside it.
Long-term data beyond several months is limited, as is the case for essentially everything in the longevity category. Interactions have not been extensively studied.
Who should avoid it
Not established for use in pregnancy or breastfeeding. Speak to your doctor before use if you take regular medication, since interaction data is limited. Long-term safety beyond several months of use has not been established.
This entry is provided for information only. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Consult a qualified healthcare professional before use if you are pregnant, breastfeeding, taking medication or under medical supervision.
