Urolithin A is a compound that your body produces rather than one you eat directly from food. It forms when gut bacteria break down ellagitannins and ellagic acid, polyphenols found in certain fruits, nuts, and plant foods. Understanding which foods supply these precursors, and how well your body converts them, is the real story behind getting more urolithin A from your diet.
What Are the Actual Dietary Sources of Urolithin A?
There are no foods that contain meaningful amounts of preformed urolithin A itself. The compound belongs to a class called urolithins, which are produced exclusively through microbial metabolism in the large intestine.[1] What you eat, however, directly determines how much raw material your gut bacteria have to work with. The key dietary precursors are ellagitannins and ellagic acid, and the foods richest in these compounds are the closest thing to foods high in urolithin A that nutrition science currently recognizes.
For a broader look at what urolithin A does once your body makes it, see our guide at urolithin A benefits and science.
Top Food Sources of Ellagitannin Precursors
The following foods are the best-studied dietary contributors of ellagitannins and ellagic acid. Higher intake of these foods is associated with greater urolithin A production in people who have the right gut bacteria to carry out the conversion.
Blackberries and some strawberries carry far more ellagic acid than walnuts
Food content is only the starting material, since how much urolithin A you end up with depends on your gut bacteria.
Figures come from a review of food composition data and vary by variety and method. Source: Hu et al., Frontiers in Nutrition 2026; Alfei et al., Antioxidants 2020.
Data table
| Item | Value |
|---|---|
| Walnuts, per 100 g fresh weight | 59 mg |
| Blackberries, per 100 g | 150 mg |
| Strawberries, lowest reported per 100 g | 31 mg |
| Strawberries, highest reported per 100 g | 184 mg |
Chart: urolithinhub.com: Blackberries and some strawberries carry far more ellagic acid than walnuts
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| Food | Primary Polyphenol Compounds | Relative Ellagitannin Content | Notes |
|---|---|---|---|
| Pomegranate (juice, arils, peel) | Punicalagins, ellagic acid | Very High | Most extensively studied in urolithin research; peel contains the highest concentration |
| Raspberries | Ellagitannins, ellagic acid | High | Fresh or frozen; ellagic acid survives freezing well |
| Strawberries | Ellagic acid, ellagitannins | Moderate-High | Widely available and frequently consumed |
| Blackberries | Ellagitannins, anthocyanins | Moderate-High | Also supply other gut-supportive polyphenols |
| Walnuts | Pedunculagin, ellagic acid | Moderate | One of the few nut sources; also supports the microbiome broadly |
| Oak-aged red wine | Ellagitannins from oak barrels | Low-Moderate | Not a recommended primary source; alcohol carries its own risks |
| Cloudberries | Ellagitannins | High | Very high concentration but limited availability outside Nordic regions |
| Muscadine grapes | Ellagic acid, ellagitannins | Moderate | More common in southeastern United States |
Pomegranate: The Most Researched Source
Pomegranate is by far the most studied ellagitannin source in the context of urolithin A production. Its principal polyphenols, the punicalagins, are large ellagitannin molecules that gut bacteria hydrolyze into ellagic acid and then convert further into urolithins. Clinical trials exploring urolithin A have frequently used pomegranate juice or pomegranate extract as the dietary vehicle. One cup of pomegranate juice provides a substantial load of punicalagins, though exact urolithin A output varies considerably between individuals.[2][3]
Berries: Accessible Everyday Sources
Raspberries and strawberries are among the most practical everyday sources of ellagic acid in Western diets. They are widely available, relatively affordable, and pair easily with meals. Blackberries also contribute, along with a broader array of anthocyanins that support general gut microbiome diversity. Berries supply ellagitannins, and in a lab fermentation of human gut microbiota, some Bifidobacterium species were more abundant in samples that made urolithin A. That is a lab finding, not proof that eating berries shifts your gut bacteria [6].
Walnuts: A Nut-Based Option
Walnuts are noteworthy because they represent a non-fruit source of ellagitannins. The compound pedunculagin found in walnuts is a recognized ellagitannin precursor. A human walnut intervention measured urolithin metabolites in urine and found the gut genus Gordonibacter enriched afterwards. Gordonibacter makes early urolithin intermediates but not the final urolithin A, so other gut bacteria are still needed to finish the job [7][8].[4]
The Critical Role of Gut Microbiome Conversion
Eating ellagitannin-rich foods is only half the equation. The actual production of urolithin A depends entirely on whether your gut microbiome contains the right bacteria, particularly Enterocloster species, which carry the enzymes that decide which urolithin end products are made. Gordonibacter handles early steps, and Ellagibacter relates to isourolithin A rather than urolithin A [8][7][9]. Research suggests the population can be divided broadly into three groups, described in the literature as urolithin metabotypes:[1][3]
- High producers: Efficiently convert ellagitannins to urolithin A with consistent dietary exposure to precursor foods.
- Low producers: Convert only small amounts even with adequate ellagitannin intake.
- Non-producers: Often make no detectable urolithins from ellagitannin foods at the time of testing, although metabotype can change within a person and over time [10][8][11].
Estimates vary. Across human trials, 5 to 25% of volunteers did not produce detectable urolithins, but in 100 healthy American adults, 33% could not convert pomegranate juice to urolithin A and another 27% converted poorly [10][5]. Age, antibiotic history, diet quality, and geographic background all appear to influence which group a person belongs to.
Dietary Factors That May Support Better Conversion
Beyond simply eating more pomegranate and berries, certain dietary patterns may improve the conditions for urolithin A production by nurturing the microbial species involved.
Research note: Free ellagic acid is only found at 0.7 to 4.7 mg per 100 g fresh weight in berries; most of it is released later by digestion and gut bacteria [16].
- High-fiber diets: Dietary fiber feeds the broader bacterial community, which supports the niche organisms involved in ellagitannin metabolism.
- Fermented foods: Yogurt, kefir, and sauerkraut support general microbial diversity, potentially seeding conditions where ellagitannin-metabolizing bacteria can thrive.
- Polyphenol variety: A diet rich in diverse plant polyphenols tends to support a more diverse and resilient gut microbiome overall.
- Reduced ultra-processed food intake: Diets high in ultra-processed foods are associated with lower microbial diversity, which may reduce conversion capacity.
- Consistent ellagitannin exposure: Regular, daily consumption rather than occasional large doses appears to produce more consistent urolithin output in some research.
Who May Struggle to Get Enough from Diet Alone
Several groups are likely to have difficulty achieving meaningful urolithin A production through dietary means:
- Non-producers: Those without the necessary gut bacteria may make little or no urolithin A from ellagitannin-rich foods, although metabotype can change within a person and over time [8][11][12]. Direct supplementation is the one route that does not depend on that conversion happening.[5]
- Older adults: Gut microbiome diversity naturally declines with age, and older adults may have reduced capacity for ellagitannin conversion at precisely the age when urolithin A’s proposed benefits for muscle and mitochondrial health are most relevant.
- People with inflammatory bowel conditions: Altered gut environments associated with IBD can disrupt the bacterial populations needed for urolithin metabolism.
- Those with limited fruit access or low dietary variety: Without regular intake of pomegranate, berries, or walnuts, precursor availability is simply too low to drive meaningful production.
- Post-antibiotic recovery: Broad-spectrum antibiotics can temporarily eliminate the niche bacteria responsible for ellagitannin conversion.
You can read more about how researchers are thinking about supplementation as a solution to these challenges at our urolithin A science overview.
Evidence Linking Food‑Derived Urolithin A to Cellular Health
Experimental work in animal models demonstrates that urolithin A can activate mitophagy, leading to improved mitochondrial quality and enhanced muscle endurance. In roundworms, urolithin A extended lifespan, and in mice and rats it improved exercise capacity. These are animal results, not human ones, and the PINK1-Parkin mitophagy pathway is the proposed mechanism [17][18].
Human studies are still emerging, but some human studies link ellagitannin-rich foods to better health markers, but the evidence is limited and mixed. In 63 patients, a few days of pomegranate juice or walnuts produced no apparent change in three prostate proliferation markers [19][20][21][22].
Dietary Sources vs. Supplements
Supplements providing synthesized or fermentation-derived urolithin A bypass the gut conversion step entirely, delivering the compound directly to the bloodstream regardless of a person’s microbiome composition. This is a meaningful practical advantage for non-producers and low producers who cannot reliably generate urolithin A from diet.
The human trials of urolithin A supplements are few and small. The two main trials, in 88 middle-aged and 66 older adults, missed their primary endpoints, both were funded by Amazentis, and a 2024 systematic review of five human studies (250 people) found no effect on physical function [13][14][15].
On the other hand, eating ellagitannin-rich foods provides a much broader package of nutrients, fiber, and polyphenols that work together in ways isolated supplements cannot replicate. Pomegranate, berries, and walnuts all deliver antioxidants, vitamins, and microbiome-supportive fiber alongside their ellagitannin content.
For most healthy adults with a well-functioning gut microbiome, a diet consistently rich in pomegranate, raspberries, strawberries, and walnuts represents a reasonable and evidence-aligned strategy. For those who are confirmed low or non-producers, or who want a guaranteed dose, direct supplementation offers a practical alternative worth discussing with a healthcare provider. Explore the differences in more detail at our supplement comparison resource.
This article is for general informational purposes only and does not constitute medical advice. Speak with a qualified healthcare professional before making changes to your diet or supplement regimen.
Frequently Asked Questions
Can I get urolithin A directly from eating pomegranate?
Not directly. Pomegranate does not contain preformed urolithin A. It contains punicalagins and ellagic acid, which your gut bacteria convert into urolithin A after digestion. Whether you actually produce urolithin A depends on which bacteria are present in your gut, not just how much pomegranate you eat.
How much fruit would I need to eat to produce meaningful urolithin A?
There is no established daily intake figure for ellagitannin-rich foods that guarantees a specific urolithin A output, because the conversion efficiency varies so widely between individuals. Studies have used amounts ranging from one cup of pomegranate juice to a few servings of mixed berries daily, but individual response depends heavily on microbiome composition. Consistent daily consumption over weeks is thought to be more effective than occasional large amounts.
Do cooking or processing methods affect ellagic acid content in foods?
Freezing berries preserves ellagitannins well, and canning and pureeing changed them little in one lab study. Juicing did not: juicing blackberries lost about 70% of ellagitannins in non-clarified juice and 82% in clarified juice. Pomegranate husk and peel hold most of the punicalagin, while the edible arils hold much less [8].
Are there herbs or supplements that boost ellagitannin intake?
Pomegranate extract, standardized for punicalagin content, is the most widely used herbal supplement for boosting ellagitannin intake. Oak bark extracts and certain Ayurvedic herbs such as triphala (which contains amalaki, or Indian gooseberry) also supply ellagitannins and have been studied in the context of urolithin production. These botanical extracts can meaningfully increase precursor availability but still depend on gut conversion for urolithin A output.
Is it worth taking a urolithin A supplement if I already eat a lot of berries and pomegranate?
If you are a consistent high producer with a healthy, diverse gut microbiome, dietary sources may be sufficient. However, since there is currently no simple consumer test to determine which producer category you fall into, some people choose to supplement as a way to ensure consistent intake regardless of gut variability. Whether that is appropriate for you is a conversation worth having with your doctor, particularly if you are older or have had recent gastrointestinal disruptions.
References
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- Cortes-Martin A et al. Urolithin A production drives the effects of pomegranate on the gut microbial metabolism of bile acids and cholesterol. Food & function (2024). PMID 38329279
- Selma MV et al. The gut microbiota metabolism of pomegranate or walnut ellagitannins yields two urolithin-metabotypes that correlate with cardiometabolic risk biomarkers. Clinical nutrition (2018). PMID 28347564
- Liu H et al. Correlation between intestinal microbiota and urolithin metabolism in a human walnut dietary intervention. BMC microbiology (2024). PMID 39548408
- Singh A et al. Direct supplementation with Urolithin A overcomes limitations of dietary exposure and gut microbiome variability in healthy adults. European journal of clinical nutrition (2022). PMID 34117375
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- Maria Victoria Selma et al. Isolation of Human Intestinal Bacteria Capable of Producing the Bioactive Metabolite Isourolithin A from Ellagic Acid. Frontiers in Microbiology (2017). PMID 28824607
- Francisco Abraham Tomás-Barberán et al. Ellagic Acid Metabolism by Human Gut Microbiota: Consistent Observation of Three Urolithin Phenotypes in Intervention Trials, Independent of Food Source, Age, and Health Status. Journal of Agricultural and Food Chemistry (2014). PMID 24976365
- Sheng Wu et al. Diverse Phytochemicals and Bioactivities in the Ancient Fruit and Modern Functional Food Pomegranate (Punica granatum). Molecules (2017). PMID 28946708
- Qu H et al. Effects of Coenzyme Q10 on Statin-Induced Myopathy: An Updated Meta-Analysis of Randomized Controlled Trials. Journal of the American Heart Association (2018). PMID 30371340
- 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). PMID 35584623
- Liu S et al. Effect of Urolithin A Supplementation on Muscle Endurance and Mitochondrial Health in Older Adults: A Randomized Clinical Trial. JAMA network open (2022). PMID 35050355
- Kuerec AH et al. Targeting aging with urolithin A in humans: A systematic review. Ageing research reviews (2024). PMID 39002645
- Silvana Alfei et al. Oxidative Stress, Antioxidant Capabilities, and Bioavailability: Ellagic Acid or Urolithins?. Antioxidants (2020). PMID 32759749
- Ryu D et al. Urolithin A induces mitophagy and prolongs lifespan in C. elegans and increases muscle function in rodents. Nature medicine (2016). PMID 27400265
- Peter M. J. Quinn et al. PINK1/PARKIN signalling in neurodegeneration and neuroinflammation. Acta Neuropathologica Communications (2020). PMID 33168089
- Antonio González‐Sarrías et al. Occurrence of urolithins, gut microbiota ellagic acid metabolites and proliferation markers expression response in the human prostate gland upon consumption of walnuts and pomegranate juice. Molecular Nutrition & Food Research (2009). PMID 19885850
- Chang Liu et al. Urolithin A: a multi-target therapeutic candidate derived from the gut microbiota for obesity and metabolic dysfunction. Frontiers in Endocrinology (2026). PMID 41884209
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