Urolithin A for CrossFit Athletes

Reviewed by SOMA HEALTH's Medical Research Team

CrossFit is a uniquely demanding blend of strength, power, and repeated high-intensity conditioning. A metcon can swing from heavy barbell work to a lung-searing sprint in minutes, and then you are asked to come back and do it again tomorrow. That mix places heavy demands on both fast, glycolytic energy and the aerobic, mitochondrial system that clears fatigue and restores you between efforts, which is why mitochondrial quality has caught the attention of functional-fitness athletes.

Urolithin A (UA) is a compound studied for its role in mitochondrial recycling. This SOMA HEALTH page explains what it is, what human trials have shown about muscle strength and endurance, and where the evidence is still early, so you can judge whether it belongs in your routine between WODs.

Why mitochondria matter for mixed-modal training

It is tempting to think of CrossFit as purely anaerobic, but the aerobic system does much of the quiet work. Between intervals and between sessions, your mitochondria drive the oxygen-dependent recovery that resynthesizes energy stores, clears metabolic byproducts, and readies muscle for the next round. Metabolic conditioning even leans on metabolic flexibility, the ability to shift between fuel systems, which itself depends on a healthy, responsive mitochondrial pool. The more capable that pool, the better an athlete tends to recover within a workout and across a training week.

Mitochondrial quality is maintained by two opposing processes: biogenesis, which builds new mitochondria, and mitophagy, which recycles worn-out ones so they can be replaced. When mitophagy slows, damaged units accumulate and average efficiency drifts down. Urolithin A is studied specifically because it appears to support mitophagy, the clean-up side of the equation. You can read more on the mechanism in what is mitophagy and mitochondrial health.

What urolithin A actually is

UA is a gut postbiotic, not a nutrient you absorb directly from food. It is produced when gut bacteria break down ellagitannins, compounds found in pomegranate, walnuts, and some berries. Crucially, only some people carry the microbes needed to make meaningful amounts, and a large share of adults are thought to convert poorly. That is why eating more pomegranate does not reliably raise UA levels, and why direct supplementation has been tested in clinical trials. For the food side, see foods high in urolithin A; for the complete overview, our urolithin A guide.

The human evidence, most established to newest

Proven in humans: safety and a mitochondrial signature

The first-in-human study, Andreux and colleagues (2019, Nature Metabolism), showed UA was safe and well tolerated in healthy older adults at doses up to 1,000 mg per day, and produced a measurable change in the expression of mitochondrial genes in muscle. For a CrossFit athlete, this establishes the basics: the compound reaches muscle and engages the intended mitochondrial pathways, with a reassuring tolerability profile at studied doses.

Strength and muscle endurance in controlled trials

Two randomized trials moved to function, and both speak to qualities CrossFit values. Singh and colleagues (2022, Cell Reports Medicine) studied middle-aged adults over four months across 500 mg and 1,000 mg arms and reported improvements in muscle strength and aspects of exercise performance, relevant to the strength side of functional fitness. Liu, D'Amico and colleagues (2022, JAMA Network Open) supplemented older adults for about four months and reported gains in muscle endurance, the fatigue resistance that carries you through a long AMRAP. The honest caveat: participants were not competitive CrossFit athletes, and outcomes were laboratory measures rather than benchmark WOD times.

Newer human research

Recent trials have broadened the evidence. A 2024 randomized study in the Journal of the International Society of Sports Nutrition examined eight weeks of UA in resistance-trained men, a population closer to the strength-training end of CrossFit. A 2025 randomized trial in Nature Aging reported that roughly 28 days of UA supported immune-cell mitochondrial health in midlife adults, relevant to the low-grade inflammation, sometimes called inflammaging, that can accompany high training frequency. A 2025 trial in distance runners has begun testing UA in an endurance-athlete setting. These add useful signal, but each is an individual trial, not a settled conclusion. See our urolithin A clinical studies page for the running list.

Preclinical research, clearly labeled

The original discoveries were preclinical. Ryu and colleagues (2016, Nature Medicine) showed UA induced mitophagy and extended lifespan in the worm C. elegans, and improved muscle function in rodents, the study that first linked UA to muscle and aging. Preclinical osteoarthritis models (D'Amico and colleagues, 2022, Aging Cell) have explored joint and cartilage effects, an intriguing angle given the loaded, repetitive movements in CrossFit, but this is animal-model work and is not evidence that UA protects or treats joints in people. Early or preclinical research is also exploring skin, gut, brain, and heart. Read all of it as hypothesis-generating, not proof of benefit in human athletes.

Honest limitations for the functional-fitness athlete

A 2024 systematic review in Ageing Research Reviews concluded that the human evidence remains emerging. That framing is important. No trial has shown that UA improves your Fran time, your back squat, or your recovery between WODs specifically, and you should distrust any claim that it does. What the human data support is narrower: tolerability at studied doses, engagement of mitochondrial pathways, and improvements in laboratory measures of strength and muscle endurance in non-athlete populations. UA is, at most, a supporting input alongside programming, sleep, protein and overall nutrition, and genuine recovery days, none of which a supplement replaces. For related reading, see urolithin A for muscle.

A note on health: this page is about supporting normal cellular energy and recovery processes, not treating any condition. Urolithin A is not a treatment for overtraining, injury, joint pain, or persistent fatigue. If you are dealing with nagging pain, unusual fatigue, or declining performance, please see your doctor rather than relying on a supplement.

Practical guidance

Human trials have used 500 mg to 1,000 mg per day, with 1,000 mg the top studied dose. Functional benefits in those trials appeared over months, so steady daily use through a training cycle is more sensible than dosing around a single competition or benchmark. UA is not a stimulant, so it does not carry pre-workout timing or dependency concerns; think of it as background support during heavy training frequency rather than a session booster. When you want to compare formats and doses, see best urolithin A gummies.

Shop SOMA HEALTH 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.