Urolithin A Benefits: Mitochondrial Health, Muscle Strength, & Healthy Aging
- Kelly Harrington, MS, RD
- 1 day ago
- 7 min read
Updated: 10 hours ago
A Dietitian's Perspective on Cellular Energy, Muscle Strength, and Healthy Aging
My path as a registered dietitian has evolved over the past 26 years, and one of the biggest revolutions has been my growing respect for nutrition supplements and their various roles in assisting the body.
I've worked the supplement industry for 13 years, where I spend my days researching ingredients, formulations, and the latest nutrition science.
At this point in my career, it takes a lot to get me excited about a supplement, and...
Urolithin A caught my attention.
My Human Design profile is a 4/1, which means I'm naturally wired to dive deeply into the topics I'm interested in. I love researching, learning, connecting the dots, and then sharing what I've discovered with my network. This topic is a perfect example of that.
As a functional nutrition dietitian, I spend a lot of time thinking about root causes. Instead of asking, "What symptom are we trying to fix?" I ask, "What is happening underneath the surface that's creating this problem in the first place?"
One of the most common concerns I hear from clients is: "I don't have the energy I used to have."
While there are many reasons for low energy, one of the biggest, and often overlooked, is mitochondrial health.
And that's exactly where Urolithin A shines.
What Is Urolithin A?
Urolithin A is a natural compound produced by specific gut bacteria in the colon when they break down plant compounds called ellagitannins and ellagic acid.
It’s important to note: not everyone can produce Urolithin A from food. Research suggests only a portion of the population has the specific gut bacteria needed to convert these compounds into Urolithin A. This ability also appears to decline with age.
In other words, you can eat all the pomegranates you want, but that doesn't necessarily mean your body will produce enough Urolithin A to experience its benefits.
Let's Talk About Mitochondria
Simplified, mitochondria are the "batteries” of the cell. Mitochondria produce ATP, which is the energy currency used by every cell in your body.
Your muscles rely on mitochondria. Your brain relies on mitochondria. Your heart, lungs, kidneys, liver, and immune system all rely on mitochondria. Every cellular process requires energy generated by mitochondria.
The problem is that mitochondrial function naturally declines with age, and as mitochondria become less efficient, energy production decreases and inflammation tends to increase.
This is one reason why getting older often causes:
Reduced stamina
Slower recovery
Loss of muscle strength
Brain fog
Reduced exercise capacity
General feelings of aging
The question becomes: How do we support healthier mitochondria?
Urolithin A and Mitophagy
Urolithin A supports a process called mitophagy.
Mitophagy is your body's ability to remove dysfunctional, aging mitochondria and replace them with healthier, more efficient ones.
When the mitophagy process works properly:
Old mitochondria are cleared out
Cellular waste is removed
New, healthier mitochondria can be created
Energy production remains more efficient
Research shows mitophagy declines and becomes less efficient with age. Recovery takes longer. Muscle mass becomes harder to maintain. Energy doesn't feel as effortless. As a result, older, less efficient mitochondria accumulate and contribute to inflammation, oxidative stress, and reduced cellular performance.
Urolithin A is one of the most well-studied nutrients known to stimulate mitophagy and support mitochondrial renewal.
That's a very big deal! This is the #1 to supplement Urolithin A on a consistent basis!
What Does the Research Say About Urolithin A?
The research on Urolithin A has focused heavily on celluar energy, muscle function and endurance, mitochondrial health, and overall healthy aging, .
Clinical studies have found that Urolithin A may support:
1. Cellular Energy Production
Because mitochondria are responsible for producing ATP, improving mitochondrial quality can help cells generate energy more efficiently.
This is energy at the deepest level possible: the cellular level.
2. Muscle Strength and Muscle Function
One of the most exciting findings from human clinical trials is the impact Urolithin A has on muscle health.
Researchers have observed improvements in:
Muscle strength
Muscle endurance
Exercise performance
Biomarkers associated with mitochondrial health
This is particularly important because age-related muscle loss (known as sarcopenia) is one of the strongest predictors of loss of independence as we get older.
Let's not forget perimenopause and how much the body changes during that hormonal phase. The ability to optimize muscle strength is the reason I started taking Urolithin A.
3. Aerobic Capacity and Endurance
The lungs and muscles have enormous energy demands. When mitochondrial function improves, oxygen utilization and aerobic performance may improve as well.
This helps explain why researchers are interested in Urolithin A for endurance, exercise performance, and healthy aging.
4. Healthy Aging and Longevity
Many of the diseases associated with aging involve mitochondrial dysfunction.
Researchers have linked impaired mitochondrial function to conditions involving:
Metabolic health
Type 2 diabetes
Cardiovascular disease
Neurodegenerative diseases
Muscle decline
While Urolithin A is not a treatment for any disease, scientists are increasingly interested in its ability to address one of the fundamental biological processes associated with aging itself.
Instead of chasing symptoms, it targets a root cause: mitochondrial quality control.
My Personal Experience with Urolithin A
I've been taking 500 mg of Urolithin A daily for the past five months.
While everyone’s experience is different, I’ve personally noticed:
An improvement in deeper sleep
Better muscle tone
What feels like a faster metabolism
I haven't changed anything else significantly during this time. Of course, my experience is anecdotal and doesn't replace clinical research, but it has reinforced why I'm excited about this nutrient.
Human Design and the Different Forms of Energy
As someone who teaches both nutrition and Human Design, the most common health desire I hear from people is: “I want more energy."
But there isn't just one kind of energy. True vitality comes when all four forms of energy are supported.
Cellular Energy
This is the energy your mitochondria produce in the form of ATP. It's physical. It's measurable. And it's the type of energy Urolithin A is designed to support.
Energetic Alignment
This is the energy that comes from living in alignment with your Human Design rather than going yourself against your natural wiring.
Many people experience a tremendous increase in vitality when they stop trying to be someone they're not and when they release and heal the stories that prevent them from being who they are meant to be.
Restorative Energy
Deep sleep remains one of the most powerful energy-producing tools available. No supplement can fully compensate for poor sleep. Personally, I've noticed deeper, more restorative sleep since taking Urolithin A.
Emotional Energy
Feeling safe, supported, and emotionally regulated changes physiology. Chronic stress, anxiety, and nervous system dysregulation expend an incredible amount of energy.
When any of these four components are compromised, we feel it. And when cellular health, sleep, emotional well-being, and energetic alignment are optimized together, people feel more energized, resilient, and more like themselves.
Final Thoughts
Urolithin A focuses on one of the most fundamental aspects of human physiology: mitochondrial health.
By supporting mitophagy and mitochondrial renewal, Urolithin A helps address energy production where it actually begins—the cell.
As a root-cause dietitian, that's what makes this supplement so fascinating to me. Healthy mitochondria influence nearly every aspect of health, from muscle strength and endurance to brain function and healthy aging.
And when you support energy at the cellular level, the effects can ripple throughout the entire body.
Urolithin A Supplement on Fullscript (Timeline Brand)
Fullscript is the safest source for practitioner-grade supplements at an excellent price with the practitioner discount I offer.
For Urolithin A, the brand Timeline is the only one I would take at this time (I am not sponsored! Just a fan.).
Working in the supplement industry has given me firsthand experience on how to navigate ingredient quality, research claims, dosing strategies, and brand integrity.
If you have any questions about supplements, I can help you through the confusion and guide you with your supplement needs. You can schedule a free 15 minute strategy call to do just that, or you can schedule a 90 minute nutrition consultation to review your current supplement plan, give supplement suggestions, answer questions, and talk about any other supplement-related topics.
Warm regards,
Kelly Harrington, MS, RD
Frequently Asked Questions about Urolithin A
What is Urolithin A?
Urolithin A is a gut microbiome-derived metabolite produced when certain intestinal bacteria break down ellagitannins and ellagic acid, compounds found in foods such as pomegranate and some berries and nuts. Because not everyone has the gut bacteria needed to produce Urolithin A efficiently, eating foods containing these compounds does not guarantee that your body will produce meaningful amounts of Urolithin A.
What does Urolithin A do?
Urolithin A has been studied for its ability to stimulate mitophagy, the body's natural process for removing damaged or dysfunctional mitochondria. Human clinical trials have also investigated its effects on muscle strength, muscle endurance, exercise performance, and biomarkers of mitochondrial health.
What is mitophagy?
Mitophagy is a specialized form of autophagy that helps the body identify and remove damaged or dysfunctional mitochondria. Think of it as cellular quality control for your mitochondria.
Who is Urolithin A ideal for?
Urolithin A may be particularly interesting to adults who want to proactively support mitochondrial health, muscle function, exercise performance, and healthy aging. It should be considered as one component of a larger approach to health—not as a replacement for good nutrition, resistance training, adequate sleep, or medical care.
How much Urolithin A should you take?
Human clinical trials have studied different doses of Urolithin A, including 250 mg, 500 mg, and 1,000 mg per day. Dr. Anurag Singh, the Chief Medical Officer at Timeline, recommends 500 mg per day if you're doing things well, such as eating nutritiously and moving 8,000-10,000 steps per day.
He recommends 1000 mg per day if you are metabolically unhealthy. However, start low and slow. Don't jump into 1000 mg immediately.
References
Kothe B, Klein S, Petrosky SN. Urolithin A as a Potential Agent for Prevention of Age-Related Disease: A Scoping Review. Cureus. 2023.
Singh A, et al. Urolithin A improves muscle strength, exercise performance, and biomarkers of mitochondrial health in a randomized trial in middle-aged adults. Cell Reports Medicine. 2022.
Liu S, et al. Effect of Urolithin A Supplementation on Muscle Endurance and Mitochondrial Health in Older Adults. JAMA Network Open. 2022.
D'Amico D, et al. Impact of the Natural Compound Urolithin A on Health, Disease, and Aging. Trends in Molecular Medicine. 2021.
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