Urolithin A for Masters Athletes

Reviewed by SOMA HEALTH's Medical Research Team

Masters athletes are rewriting what the aging body can do. If you are training and competing into your forties, fifties, sixties and beyond, the question is rarely about motivation. It is about the cellular machinery that turns training into performance, and how to keep that machinery working as the years add up. Urolithin A is one compound getting serious attention for exactly this reason.

Longitudinal studies of masters track, road-running and swimming performance show a familiar pattern: strength and endurance are broadly maintained through midlife, then decline more steeply from the sixties onward. Researchers who study this trajectory describe masters athletes as a kind of living map of healthy aging, because their decline is slower and later than the general population, yet it still tracks predictable changes underneath. One of the most consistent of those changes happens inside the muscle cell, in the mitochondria.

Why mitochondria sit at the center of masters performance

Mitochondria are the structures that convert fuel and oxygen into usable energy. Endurance capacity, the ability to repeat efforts, and how quickly you recover between sessions all depend heavily on mitochondrial density and quality. With age, two things tend to happen: the total pool of healthy mitochondria can shrink, and the cell's routine housekeeping slows down, so worn-out mitochondria accumulate instead of being cleared and replaced.

That housekeeping process has a name: mitophagy. It is the targeted recycling of damaged mitochondria so the cell can rebuild fresh ones. When mitophagy runs efficiently, muscle cells keep a cleaner, more capable energy supply. When it slows, cellular debris builds up and energy output can suffer. If you want the deeper mechanics, our explainer on mitophagy and our overview of mitochondrial health walk through it step by step.

Where urolithin A fits

Urolithin A is a gut postbiotic. You do not get it directly from food. Instead, your gut bacteria produce it from ellagitannins, compounds found in pomegranates, walnuts and certain berries. The catch is that only some people carry the microbes needed to make meaningful amounts, which is why two athletes eating the same pomegranate can end up with very different urolithin A levels. In laboratory research, urolithin A acts as a signal that supports mitophagy, which is the reason it has become a compound of interest for muscle and healthy aging.

What the human evidence actually shows

This is where precision matters. The urolithin A research base is genuinely promising, but it is still emerging, and it is important to separate what has been tested in people from what has only been observed in cells and animals. A 2024 systematic review in Ageing Research Reviews, which looked specifically at targeting aging with urolithin A in humans, reached a measured conclusion: the human evidence is encouraging but still developing.

Proven in humans first

Safety and mitochondrial signaling (HUMAN). The first-in-human trial, Andreux and colleagues in Nature Metabolism (2019), found urolithin A was safe and well tolerated at doses up to 1,000 mg per day and produced a measurable shift in mitochondrial gene expression in older adults. That established both a safety ceiling and a plausible biological effect.

Muscle endurance in older adults (HUMAN). Liu, D'Amico and colleagues, published in JAMA Network Open (2022), studied older adults over roughly four months and reported improvements in a measure of muscle endurance. For masters athletes, endurance and fatigue resistance are often the traits that hold up an entire race or match, so this is directly relevant.

Strength and exercise performance in midlife (HUMAN). Singh and colleagues in Cell Reports Medicine (2022) tested 500 mg and 1,000 mg daily arms in middle-aged adults over four months and reported benefits in muscle strength and aspects of exercise performance. This is one of the more directly athletic human datasets available.

Newer human research

Resistance-trained men (HUMAN). An eight-week randomized controlled trial published in the Journal of the International Society of Sports Nutrition (2024) looked at resistance-trained men, moving the conversation closer to already-fit populations rather than sedentary starting points.

Endurance runners (HUMAN). A 2025 trial in distance runners extended the picture into a trained endurance population, which is squarely the masters demographic on the roads and track.

Immune-cell mitochondria and inflammaging (HUMAN). A 2025 randomized controlled trial in Nature Aging, running about 28 days, reported that urolithin A supported the mitochondrial health of immune cells in midlife adults, in the context of the low-grade inflammation sometimes called inflammaging. Recovery is partly an immune process, so this line of work is worth watching.

Preclinical research (label it as such)

Much of the excitement traces back to preclinical work, and it should be read as foundational rather than confirmed in humans. Ryu and colleagues in Nature Medicine (2016) showed that urolithin A triggered mitophagy, extended lifespan in the worm C. elegans, and improved muscle function in rodents. That is where the mitophagy-to-muscle story originates, in models, not people. Separately, D'Amico and colleagues in Aging Cell (2022) reported effects on joint and cartilage tissue in osteoarthritis models, which is preclinical and not a claim about human joints. For masters athletes carrying decades of training load through the knees and shoulders, this is an area of early interest, not established benefit.

Practical guidance for masters athletes

The dose studied in human trials ranges from 500 to 1,000 mg per day, with 1,000 mg at the top of the tested range and the level used in several of the strength and performance studies. Urolithin A is taken consistently rather than as a pre-workout stimulant; it is not a caffeine-style energizer and you should not expect an acute jolt. The human muscle trials ran for roughly two to four months, so a realistic evaluation window is measured in weeks, not days. Our guides on how long urolithin A takes to work and urolithin A for muscle go deeper on timelines and expectations.

Think of it as one input inside a complete program. Progressive resistance training, adequate protein, sleep, and sensible periodization remain the foundation of masters performance. A mitophagy-supporting compound is a complement to that work, not a replacement for it. For the full scientific background, start with our complete urolithin A guide, and if you are comparing products, see our roundup of the best urolithin A gummies.

An important note: the topics touched on here, including muscle aging, joint comfort and recovery, are described in structure and function terms only. Urolithin A is not a treatment for any medical condition. If you have joint pain, an injury, or a health concern that affects your training, see your doctor rather than relying on a supplement.

*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.