Urolithin A is gaining attention as a supplement for muscle health, mitochondrial function, and healthy aging. Your gut bacteria can produce this compound from certain foods, but not everyone makes enough to achieve the levels studied in clinical research.

Scientists are particularly interested in its ability to support mitophagy, a natural process that helps cells remove damaged mitochondria. Human studies have found promising results for muscle strength and endurance, although its long-term effects on aging remain unclear. (1)(2)

Key Takeaways:

• Urolithin A supports mitochondrial health by influencing mitophagy, the process that helps remove damaged mitochondria.
• Human studies show promising muscle benefits. One trial reported around a 12% improvement in certain leg strength measurements. (2)
• Not everyone produces Urolithin A naturally. In one study, only around 40% of adults produced substantial amounts after drinking pomegranate juice. (3)
• Research has tested 500 to 1,000 mg daily, but scientists have not established an ideal dose for everyone.

What Is Urolithin A?

Urolithin A is a natural compound produced when certain gut bacteria break down ellagitannins and ellagic acid, two plant compounds found in foods such as pomegranates, walnuts, strawberries, and raspberries.

It belongs to a group of compounds called urolithins and is sometimes described as a postbiotic.

Here's the interesting part: eating pomegranate doesn't automatically mean your body will produce much Urolithin A.

In a study of 100 healthy adults, researchers found that only around 40% produced substantial amounts after drinking pomegranate juice. The remaining participants produced little or none. (3)

This difference comes down largely to the gut microbiome. Some people have the bacteria needed to make Urolithin A efficiently, while others don't.

Direct Urolithin A supplements bypass this conversion step and provide a measured amount of the compound.

What Does Urolithin A Do?

Urolithin A is best known for its effects on mitophagy, the process your cells use to remove damaged or poorly functioning mitochondria.

Mitochondria produce much of the energy your cells need. As we age, mitochondrial function can decline, particularly in energy-demanding tissues such as muscles.

Think of mitophagy as a cellular cleanup system. Instead of allowing damaged mitochondria to accumulate, your cells break them down and recycle their components.

Research suggests Urolithin A can influence this process and support several markers of mitochondrial health. (1)

However, improvements in these cellular markers don't automatically translate into noticeable improvements in energy, physical performance, or lifespan.

Urolithin A Benefits: What Does Research Show?

Most human research on Urolithin A has focused on muscle function, mitochondrial health, and healthy aging.

1. May Improve Muscle Strength and Endurance

Muscle health is one of the most promising areas of Urolithin A research.

In a four-month clinical trial involving 88 middle-aged adults, researchers tested 500 mg and 1,000 mg of Urolithin A daily.

The results showed:

• The 500 mg group experienced a 12% improvement in average hamstring strength, compared with a decline in the placebo group.
• The 1,000 mg group showed approximately 9.8% improvement in the same measurement.
• Some measures of walking performance and aerobic endurance also improved, although the study's primary outcome, peak power output, did not improve significantly. (2)

Another trial involving 66 adults aged 65 to 90 found that taking 1,000 mg daily for four months improved certain measures of hand and leg muscle endurance.

However, walking distance and maximal ATP production, the study's primary outcomes, did not improve significantly compared with placebo. (4)

These findings are encouraging, but larger studies are needed to understand the practical benefits.

2. May Support Mitochondrial Health

Early human research suggests Urolithin A can influence several markers associated with mitochondrial function.

In a clinical study involving healthy older adults, taking 500 or 1,000 mg daily for four weeks changed mitochondrial gene expression and reduced circulating acylcarnitines, compounds involved in fatty acid metabolism. (1)

These changes suggest potential improvements in mitochondrial metabolism.

Still, researchers have not established that Urolithin A consistently increases cellular energy production in humans.

3. May Support Healthy Aging

Much of the excitement surrounding Urolithin A comes from laboratory and animal research connecting mitophagy with aging.

However, evidence in humans remains limited.

A 2024 systematic review examined five clinical studies involving 250 healthy participants. Researchers found improvements in some measures of muscle strength, endurance, and mitochondrial activity.

They found no clear improvements in body composition, cardiovascular outcomes, or broader physical function. (5)

No human clinical trial has demonstrated that Urolithin A extends lifespan or reverses aging. For now, its potential role in healthy aging looks promising, but it remains an active area of research.

What Is Mitopure?

Mitopure is a branded form of Urolithin A developed by Timeline.

Several major clinical trials investigating Urolithin A used Mitopure, including studies examining muscle strength, endurance, and mitochondrial biomarkers. (1)(2)(4)

The potential Mitopure benefits are closely tied to the Urolithin A research discussed above.

However, Mitopure isn't a different molecule. Other supplements can contain Urolithin A as their active ingredient, although purity, formulation, and quality testing may differ.

Results from studies using Mitopure cannot automatically be attributed to every supplement containing Urolithin A.

How Much Urolithin A Should You Take?

Human research has investigated daily doses ranging from 10 mg to 1,000 mg, with several major clinical trials focusing on 500 mg and 1,000 mg daily. (5)

Both doses have shown encouraging results in certain muscle and mitochondrial measurements.

However, there isn't enough evidence to conclude that 1,000 mg works better than 500 mg for everyone.

Most clinical studies have lasted between four weeks and four months. Researchers still need to determine the most effective dose for long-term use.

If you're considering supplementation, follow the product directions and discuss the appropriate dose with your healthcare provider.

Is Urolithin A Safe?

Urolithin A has generally been well tolerated in human clinical trials.

A 2024 systematic review found that reported adverse events were mild or moderate and were not considered related to Urolithin A supplementation. (5)

However, most studies have been relatively small and short.

Long-term safety data remain limited, particularly for people with chronic health conditions or those taking prescription medications.

Pregnant or breastfeeding individuals should avoid supplementation unless their healthcare provider recommends it, as safety data for these groups are insufficient.

What to Look for When Buying Urolithin A

If you're planning to buy Urolithin A, don't judge a supplement by its marketing claims alone.

Here are a few things worth checking:

• Dosage: Look for a clearly stated amount of Urolithin A per serving.
• Purity: Choose products that disclose their ingredient purity.
• Third-party testing: Independent testing can help verify ingredient content and check for contaminants.
• Ingredient transparency: Avoid proprietary blends that hide how much Urolithin A you're getting.
• Price per serving: Compare products based on their actual Urolithin A content rather than bottle price.

A higher price doesn't necessarily mean better results. Product quality and transparent labeling matter more than flashy longevity claims.

Is Urolithin A Worth Taking?

Urolithin A is an interesting option for adults looking to support mitochondrial health and muscle function as they age.

Unlike many longevity supplements backed mainly by animal experiments, Urolithin A has several human clinical trials showing measurable benefits.

Still, the research has limitations. Some improvements appeared only in secondary outcomes, and long-term health benefits remain uncertain.

It's worth considering as a supplement, but it shouldn't replace exercise, adequate protein intake, sleep, or other habits with stronger evidence for healthy aging.

Final Words

Urolithin A offers a promising approach to supporting mitochondrial health, particularly as we age. Human studies have reported improvements in certain muscle strength and endurance measurements, although there's still plenty to learn about its long-term benefits.

For now, the strongest evidence points toward muscle and mitochondrial support rather than dramatic anti-aging effects.

At Omre, we've developed our Urolithin A supplement with 500 mg of 98% purity Urolithin A per serving, a dose studied in human clinical research. It's third-party tested and made for those who want a simple, research-informed addition to their healthy aging routine.

FAQs

What does Urolithin A do in the body?

Urolithin A helps regulate mitophagy, a cellular process that removes damaged mitochondria. Human research suggests it may support mitochondrial health and certain measures of muscle strength and endurance.

What foods contain Urolithin A?

Pomegranates, walnuts, strawberries, and raspberries contain compounds that gut bacteria can convert into Urolithin A. However, the amount your body produces depends on your gut microbiome.

Is Urolithin A the same as Mitopure?

Mitopure is a branded form of Urolithin A used in several human clinical studies. Both contain the same active molecule, but supplement formulations, purity, and quality standards can differ.

How long does Urolithin A take to work?

Some studies have reported changes in mitochondrial biomarkers after four weeks, while improvements in muscle function have been observed after four months. Individual results may vary, and researchers haven't established a reliable timeline for noticeable benefits.

Can Urolithin A reverse aging?

No human research has demonstrated that Urolithin A reverses aging or extends lifespan. Studies suggest possible benefits for mitochondrial health and muscle function, but more research is needed.

References

1. Andreux PA, et al. (2019). The mitophagy activator urolithin A is safe and induces a molecular signature of improved mitochondrial and cellular health in humans. Nature Metabolism.
2. Singh A, et al. (2022). Urolithin A improves muscle strength, exercise performance, and biomarkers of mitochondrial health in a randomized trial in middle-aged adults. Cell Reports Medicine.
3. Singh A, et al. (2022). Direct supplementation with Urolithin A overcomes limitations of dietary exposure and gut microbiome variability in healthy adults to achieve consistent levels across the population. European Journal of Clinical Nutrition.
4. Liu S, et al. (2022). Effect of Urolithin A Supplementation on Muscle Endurance and Mitochondrial Health in Older Adults: A Randomized Clinical Trial. JAMA Network Open.
5. Kuerec AH, et al. (2024). Targeting aging with urolithin A in humans: A systematic review. Ageing Research Reviews.