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
muscle endurance and cellular energy may improve on testing
Ongoing
mitophagy support, one of the better-studied longevity compounds
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.
Usage
Entry Dose
250mg
Standard Dose
500mg
Max Dose
1000mg
Onset
4–8 weeks (mitophagy/muscle)
Combinations
Pairs well with
Synergistic
Creatine — mitophagy-cleared mitochondria paired with creatine's ATP-buffering supports muscle performance
CoQ10 — supports the newly cleared, functional mitochondrial population
Resistance training — mitophagy and exercise-induced mitochondrial biogenesis are complementary
Avoid combining
Contraindicated
No major known contraindications — limited long-term human safety data beyond clinical trial windows
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.