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Moderate evidenceLongevity & antioxidants

Urolithin A

One of the few "longevity" compounds with real, industry-independent-ish randomized human data showing modest gains in muscle endurance in middle-aged and older adults. The effects are small, and in trained athletes there is nothing.

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What the science says

  • Muscle endurance in middle-aged and older adults Moderate evidence

    A 4-month RCT in 66 middle-aged adults (Cell Reports Medicine 2022) found 500 mg or 1,000 mg/day improved hamstring muscle strength by roughly 12% versus baseline and improved peak power and aerobic endurance, though the primary endpoint of muscle endurance change versus placebo was not uniformly met. A separate 4-month JAMA Network Open RCT in 88 older adults found improved muscle endurance in hand and leg muscles and reduced plasma C-reactive protein and ceramides, with no change in the primary 6-minute walk distance.

  • Mitophagy and mitochondrial biomarkers Moderate evidence

    Both major RCTs showed consistent changes in plasma mitochondrial and inflammatory biomarkers (acylcarnitines, C-reactive protein, ceramides) in the direction of improved mitochondrial function. This gives the mechanism — mitophagy induction, demonstrated in preclinical models — some human plausibility, though biomarkers are not outcomes.

  • Athletic performance in trained individuals Limited evidence

    A 2025 trial in highly trained male distance runners found urolithin A supplementation did not meaningfully improve running performance, recovery or mitochondrial biomarkers. The benefit appears to be specific to people whose baseline mitochondrial function is already declining — a common pattern for this class of compound.

  • Why supplementation is needed at all Moderate evidence

    Urolithin A is a gut bacterial metabolite of ellagitannins from pomegranate, walnuts and berries, but only about 30-40% of people carry the microbiota capable of producing it. This is a genuine rationale for direct supplementation rather than eating pomegranate, and it is well documented.

Dosage & safety

Studied doseTrials have used 500-1,000 mg/day for 4 months. The 500 mg dose captured most of the benefit in both major RCTs; 1,000 mg did not clearly add more. Take with food. Effects took 2-4 months to appear, so short trials are uninformative.
SafetyWell tolerated across trials up to 1,000 mg/day for 4 months, with adverse event rates similar to placebo (mild GI symptoms most common). Urolithin A (the branded Mitopure form) has US FDA GRAS notification. No serious safety signals have emerged, but data beyond 4-6 months are limited. It has weak estrogenic/anti-estrogenic activity in vitro, so caution in hormone-sensitive conditions is reasonable. No pregnancy or lactation data. Note that most published trials were funded by the manufacturer, which is a real limitation on how confidently the modest effect sizes should be read.

How to take it

TimingTiming does not matter.
With food?With food, as dosed in the trials.
Worth knowingEffects took 2-4 months to appear in both major trials, so judging it after a few weeks tells you nothing.

Frequently asked questions

Does urolithin A improve muscle strength?

Urolithin A has moderate evidence for modest muscle gains in middle-aged and older adults: 4-month trials found better muscle endurance and strength, though some primary endpoints were not met. In trained distance runners, urolithin A did nothing measurable.

Can I get urolithin A from pomegranate?

Only if your gut bacteria can make it: urolithin A is produced from pomegranate, walnut and berry ellagitannins, but only about 30-40% of people carry the microbes to do so. That is a genuine reason to take urolithin A directly.

How much urolithin A should I take?

Trials used 500-1,000 mg/day of urolithin A with food, and 500 mg captured most of the benefit. Effects took 2-4 months to appear, so judging urolithin A after a few weeks tells you nothing.

Is urolithin A safe?

Urolithin A was well tolerated at up to 1,000 mg/day for 4 months, with side effects similar to placebo, and has US GRAS notification. Data beyond 4-6 months are limited, and most urolithin A trials were funded by the manufacturer.

Scientific references

Where to buy

Timeline, Urolithin A, Strawberry, 60 Vegan Gummies

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