Urolithin A for Stamina
Stamina, the ability to keep producing effort without fading, is ultimately a story about energy at the cellular level. Urolithin A is studied for how it supports the mitochondria that generate that energy, and for measures of muscle endurance in humans. Here is what the evidence supports, what it does not, and how to think about it honestly.
What stamina really depends on
When people say they want more stamina, they usually mean sustained output: getting through a long workout, a demanding shift, or an active day without hitting a wall. Physiologically, sustained effort relies heavily on aerobic energy production inside your mitochondria, the structures that convert fuel and oxygen into ATP, the currency your muscles spend. Endurance-oriented, fatigue-resistant muscle fibers are especially dense with mitochondria. When those mitochondria are numerous and working cleanly, sustained work is better supported; when their quality drifts, output tends to sag.
Mitochondrial quality is maintained partly through mitophagy, a recycling process that removes worn units so the healthier ones can carry the load. Urolithin A is a gut postbiotic studied in relation to this process. It is not supplied directly by food. Gut bacteria manufacture it from ellagitannins in pomegranate, walnuts, and certain berries, and only some people carry the microbes needed to convert those precursors into meaningful amounts. That is a central reason researchers study a consistent supplemental dose. Our urolithin A guide and our page on urolithin A for energy add context.
The human evidence on endurance and performance
This is where stamina-related claims should be anchored, and it is worth being precise about what was measured.
Muscle endurance in older adults (human)
In a randomized, placebo-controlled trial in JAMA Network Open in 2022 (Liu, D'Amico and colleagues), older adults taking urolithin A for roughly four months showed improvements in measures of muscle endurance. Endurance is the outcome most directly tied to what people mean by stamina, which makes this one of the more relevant results.
Strength and exercise performance in middle-aged adults (human)
A 2022 trial in Cell Reports Medicine (Singh and colleagues) studied middle-aged adults over four months at 500 mg and 1,000 mg daily and reported effects on aspects of muscle strength and exercise performance. A 2024 randomized controlled trial in the Journal of the International Society of Sports Nutrition tested resistance-trained men over eight weeks, and a 2025 trial extended research into distance runners, a group defined by endurance capacity.
Safety and the cellular mechanism (human)
The first-in-human trial (Andreux and colleagues, Nature Metabolism, 2019) reported that urolithin A was safe and well tolerated up to 1,000 mg per day and produced a mitochondrial gene-expression signature consistent with its proposed mechanism. A 2025 randomized controlled trial in Nature Aging, over about 28 days, reported support for immune-cell mitochondrial health in midlife adults facing age-related low-grade inflammation. Taken together, these are the human anchors: measured endurance outcomes plus a documented safety profile.
What is still preclinical or emerging
A 2024 systematic review in Ageing Research Reviews on targeting aging with urolithin A in humans concluded that the overall evidence is still emerging, and that is the accurate frame. The most striking mechanistic findings are preclinical: Ryu and colleagues (Nature Medicine, 2016) showed urolithin A induced mitophagy, improved muscle function in rodents, and extended lifespan in the worm C. elegans. Those are animal and cell results that motivated the human work rather than proving human stamina benefits on their own.
People chasing stamina sometimes hope a single compound will address energy everywhere, from joints to heart to brain. Be clear-eyed here: joint and cartilage findings (D'Amico and colleagues, Aging Cell, 2022) come from osteoarthritis models, not human trials, and interest in heart, brain, gut, and skin remains early and preclinical. Urolithin A is a structure/function supplement that supports mitophagy and cellular energy processes. It is not a treatment for fatigue caused by a medical condition. Persistent, unexplained tiredness is a reason to see a doctor, because it can signal issues like anemia, thyroid problems, sleep disorders, or other conditions that a supplement will not address.
How to fit it into a stamina plan
Because the trials ran for weeks to months, urolithin A is a daily, cumulative supplement, not an acute energy shot. The studied range was 500 to 1,000 mg per day, with 1,000 mg as the ceiling. See our pages on urolithin A dosage and how to take urolithin A. It performs as a complement to the real drivers of stamina: consistent aerobic and resistance training, sufficient sleep, adequate protein and overall nutrition, and hydration. If your stamina has dropped noticeably or suddenly, treat that as a medical question first and speak with your provider before assuming a supplement is the answer.
Frequently asked questions
Is urolithin A a pre-workout energy booster?
No. It is not a stimulant and was not studied as an acute pre-workout aid. The human endurance and performance results came from daily use over months, so it belongs in a consistent routine, not the 30 minutes before exercise.
Which stamina outcome has the best human data?
Muscle endurance has the most directly relevant human signal, from the 2022 JAMA Network Open trial in older adults over about four months. See urolithin A clinical studies for the full list.
What dose should I look for?
Human trials used 500 mg and 1,000 mg per day, with 1,000 mg as the studied top. SOMA HEALTH Urolithin A Gummies provide 1,000 mg in a four-gummy daily serving.
Will it help if I feel tired all the time?
Ongoing or unexplained fatigue can have medical causes that a supplement will not fix. That is a reason to see your doctor rather than self-treat. Urolithin A supports cellular energy processes but is not a treatment for fatigue.
Can I get enough from food?
Foods like pomegranate and walnuts supply the precursors, but only some people convert them into meaningful urolithin A because of gut bacteria differences. A standardized dose bypasses that variability. See foods high in urolithin A.
How long until I might notice a difference?
The studies measured outcomes over roughly four months, so consistency matters more than any single day. Read how long urolithin A takes to work.
Explore SOMA HEALTH Urolithin A Gummies
To weigh formats and quality markers, see our roundup of the best urolithin A gummies.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This guide is educational and is not a substitute for advice from a qualified healthcare provider.
A clinically studied 1,000 mg dose of Urolithin A in one simple daily gummy — to support mitophagy, muscle strength, and cellular energy.
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