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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.

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.

Scientific references

Where to buy

Timeline, Urolithin A, Strawberry, 60 Vegan Gummies

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