Urolithin A
Research Reliability -
A gut-microbiome-derived metabolite of pomegranate ellagitannins that clears damaged mitochondria and supports endurance.
Appetite
Mood
Sleep
Urolithin A
Description
Urolithin A is not absorbed directly from food — it is produced when gut bacteria metabolize ellagitannins found in pomegranates, berries, and walnuts, and only 30–40% of people host the bacterial strains needed to produce meaningful amounts naturally. This is why direct urolithin A supplementation (popularized by Mitopure-style research) has become popular: it bypasses microbiome variability entirely. It works by promoting mitophagy, the selective recycling of dysfunctional mitochondria, which clinical trials have linked to improved muscle endurance and strength in middle-aged and older adults over four-month periods.
Effects
First 2 weeks
subtle
Weeks 4–8
Ongoing
How It Feels
Effects are gentle; some people report better muscle endurance or recovery over a couple of months, and it has more human data than most longevity compounds. Do not expect an acute lift. Its work is at the mitochondrial level.
Evidence
Evidence Strength
Moderate (some human RCTs)
Caveats
This pivotal trial missed its primary endpoint (peak leg power) while showing improvement on secondary endurance and strength measures; evidence applies to the specific branded Urolithin A ingredient studied.
Usage
Commonly Referenced Starting Amount
500 mg/day
Commonly Referenced Amount
500–1,000 mg/day covers the two doses tested in the pivotal human trials, both reported as safe and well tolerated
Referenced Upper Limit
No upper limit has been established. This is genuinely one of the better-evidenced longevity compounds on this list, though the muscle-strength and mitochondrial benefits measured are real but modest. Worth knowing: only about 40% of people naturally produce meaningful urolithin A from dietary sources, which is the rationale for supplementing it directly
Onset
4–8 weeks (mitophagy/muscle)
Biomarkers to Track
Subjective
(Daily)
Exercise endurance and recovery
Muscle soreness after training
Energy levels (1–10)
Objective
(Quarterly)
Six-minute walk test distance
Grip strength
Creatine kinase (muscle damage marker)
Generally safe and one of the better-studied longevity compounds.
Pregnant and breastfeeding women, due to limited data.
Expecting an acute lift, when muscle benefits build over months.
Disclaimer
This information is for educational purposes only and is not medical advice. It is not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare provider before starting any new supplement, especially if you are pregnant, nursing, taking medication, or managing a health condition.
Singh A et al. (2022). Cell Reports Medicine, 3(5), 100633. RCT (branded Urolithin A/Mitopure and muscle strength/endurance in middle-aged adults). DOI: 10.1016/j.xcrm.2022.100633.
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