Urolithin A and Your Kidneys: What to Know

If you are considering a mitochondrial supplement and you have your kidneys on your mind, you deserve a straight answer rather than marketing. Here is what the human research on urolithin A actually shows about tolerability, what it does not show, and why anyone with kidney concerns should talk to a clinician first.

Why kidneys come up with any new supplement

The kidneys are the body's primary filtration system. They clear metabolic byproducts, balance fluids and electrolytes, and help excrete many compounds you eat, drink, or supplement. Because so much of what enters the bloodstream eventually passes through them, it is reasonable and responsible to ask how a new ingredient is handled before you take it every day.

Urolithin A is worth understanding on its own terms. It is not a stimulant, a hormone, or a high-dose mineral. It is a gut postbiotic: your microbiome produces it from ellagitannins, the natural compounds found in pomegranate, walnuts, and certain berries. Only some people carry the gut bacteria that convert those precursors efficiently, which is one reason a standardized supplement exists at all. Once absorbed, urolithin A is largely conjugated in the body (bound to glucuronide and sulfate groups) and its metabolites are eliminated in part through the urinary route. That processing is normal for many dietary polyphenol metabolites, but it is exactly why the kidney question is fair to ask.

What urolithin A does inside cells

The reason urolithin A is studied at all is mitophagy. Mitochondria are the tiny power plants inside your cells, and over time some become worn or damaged. Mitophagy is the housekeeping process that identifies these underperforming mitochondria and recycles them so newer, more efficient ones can take their place. In laboratory and animal work, urolithin A has been shown to support this recycling process. If you want the full mechanism, our urolithin A guide and our explainer on what mitophagy is go deeper. The short version: urolithin A is being studied as a way to support mitochondrial health, not as anything targeted at the kidneys specifically.

What the human trials actually show about tolerability

This is where evidence strength matters. We will organize it from strongest to most preliminary, and label what is human versus preclinical.

First-in-human safety (HUMAN)

The foundational human safety work is Andreux and colleagues, published in Nature Metabolism in 2019. This first-in-human study reported that urolithin A was safe and well tolerated at single and repeated doses up to 1,000 mg per day, and it detected a mitochondrial gene-expression signature in participants. Tolerability in that trial was assessed in generally healthy adults, not in people with diagnosed kidney disease.

Repeated-dosing trials in adults (HUMAN)

Several controlled trials have since given urolithin A to generally healthy adults for roughly four months. Liu, D'Amico and colleagues (2022, JAMA Network Open) studied older adults and reported improvements in a measure of muscle endurance. Singh and colleagues (2022, Cell Reports Medicine) studied middle-aged adults using 500 mg and 1,000 mg daily arms and reported effects on muscle strength and exercise performance. A 2025 randomized trial in Nature Aging ran about 28 days and reported support for immune-cell mitochondrial health in midlife adults. Across these trials the compound was generally well tolerated. Again, participants were broadly healthy adults; these studies were not designed to evaluate people with reduced kidney function.

What the research does NOT show

It is just as important to state the boundaries clearly. There is no human evidence that urolithin A treats, prevents, or improves any kidney condition, and SOMA HEALTH makes no such claim. Chronic kidney disease, kidney stones, reduced glomerular filtration, and dialysis are medical situations that require a clinician, not a supplement decision made from a web page.

You may encounter early laboratory work exploring urolithins in the context of diabetic kidney models. That research is preclinical, meaning it comes from cells and animals, not from human trials, and it is not proof of any benefit in people. We mention it only so you are not misled by it elsewhere: preliminary signals in a petri dish or a mouse are a reason for scientists to keep studying, not a reason for you to expect a result.

Practical guidance if kidneys are on your mind

A few sensible principles apply to any daily supplement, urolithin A included:

Talk to your clinician first if you have any kidney condition

If you have chronic kidney disease, a history of kidney stones, a single kidney, reduced kidney function, or you are on dialysis, do not start urolithin A without checking with the clinician who manages your care. This is not a treatment for any of those situations, and your care team should weigh in on anything you take daily.

Stay within the studied dose

The clinically studied range is 500 to 1,000 mg per day, with 1,000 mg at the top of that range. More is not better, and there is no reason to exceed what has actually been tested. Our page on urolithin A dosage covers this in detail.

Hydrate normally and keep the rest of your routine sensible

General kidney-friendly habits, such as staying well hydrated and being mindful of your total intake of supplements and medications, are simply good practice. If you take other daily products, our side effects and safety overview is a useful companion read.

Choose a tested product

Purity matters more when you take something every day. The SOMA HEALTH Urolithin A Gummies deliver 1,000 mg per four-gummy daily serving, are third-party tested, and are sugar-free. If you are comparing options, our roundup of the best urolithin A gummies lays out what to look for.

Not a treatment — see your doctor. Nothing here is intended to diagnose, treat, or manage any kidney condition. If you have kidney symptoms or a diagnosed kidney problem, your clinician is the right person to guide what you take.

*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.