Urolithin C
Urolithin C is one of the lesser-known metabolites from the same family as the well-studied urolithin A — it forms from the same plant compounds, but in cell and animal studies it stands out with a different activity profile, including in the context of insulin secretion.
Number of studies
3
Safety
High
Time to effects
No human data — the effects described so far come exclusively from cell-based studies and animal models.
Who it's for
Table of contents
TL;DR
Urolithin C is one of the lesser-known metabolites from the same family as the well-studied urolithin A — it forms from the same plant compounds, but in cell and animal studies it stands out with a different activity profile, including in the context of insulin secretion.
- →In studies on isolated pancreatic beta cells, enhanced glucose-dependent insulin secretion
- →Showed strong antioxidant activity in cell-based assays
- →In vitro and in animal models, inhibited proliferation of certain colorectal cancer cell lines
| Compound family | Urolithins — metabolites of ellagitannins and ellagic acid produced by gut microbiota |
|---|---|
| Relationship to urolithin A | A distinct molecule from the same metabolic family, studied in a different context (glucose metabolism, not mitophagy) |
| Research level | Early — mainly in vitro and animal-model studies, no human clinical trials |
| Studied mechanism | Glucose-dependent stimulation of insulin secretion via L-type calcium channels |
| Precursor sources | Pomegranates, walnuts, raspberries, strawberries, acorns (plants rich in ellagitannins) |
| Inter-individual variability | Depends on so-called urolithin metabotype — an individual's gut microbiota composition |
Understand
Overview
Urolithin C is one of several metabolites in the urolithin family — compounds formed in the gut from ellagitannins and ellagic acid, present in foods such as pomegranates, walnuts, raspberries, and strawberries. The best-characterized and most-studied member of this family is urolithin A, known mainly from research on mitophagy (the process of clearing damaged mitochondria) and muscle health. Urolithin C forms from the same plant precursors via the same metabolic pathway, but it is studied far less often and in a different context — the existing literature focuses more on its potential effects on glucose metabolism, pancreatic beta-cell function, and antioxidant properties, rather than on mitophagy or muscle health as with urolithin A.
It's worth stressing that urolithin C is not a "better" or "worse" version of urolithin A — it is a distinct molecule with a different chemical structure, formed at a different stage of the same microbial transformation pathway. Interest in it stems partly from a desire to understand the entire urolithin family as a group, and partly from specific, early observations about its biological activity in cell and animal models.
This is very much a topic from the basic-science end of the spectrum — available data comes almost exclusively from in vitro studies (cell lines, isolated pancreatic islets) and animal models. Direct clinical studies in humans, comparable to those conducted for urolithin A, are currently lacking.
Mechanism of action
Like the other urolithins, urolithin C forms in the colon through a multi-step breakdown of ellagic acid by gut bacteria (including genera such as Gordonibacter and Ellagibacter). The composition and activity of a given person's microbiota determines what proportions of the individual urolithins (A, B, C, D, and others) are produced — a phenomenon described as urolithin metabotypes, i.e., individual "profiles" of production that differ between people.
In cell-based studies, urolithin C has shown the ability to enhance glucose-dependent insulin secretion from pancreatic beta cells by activating L-type calcium channels and the ERK1/2 kinase pathway — an effect dependent on glucose levels, which in theory distinguishes it from classic drugs that stimulate insulin secretion regardless of glucose concentration. Other cell-based and animal studies have observed antioxidant activity as well as an inhibitory effect on the proliferation of certain colorectal cancer cell lines via the AKT/mTOR pathway. All these mechanisms remain at the preclinical research stage, however — they have not been confirmed in human interventional trials.
Intake of plant precursors
Dietary ellagitannins and ellagic acid (pomegranates, walnuts, berries) reach the colon undigested.
Conversion by gut microbiota
Gut bacteria break down ellagic acid in a multi-step process, one of whose intermediate and final products is urolithin C.
Absorption and biological activity
Absorbed urolithin C shows antioxidant activity and an effect on insulin secretion from pancreatic beta cells in cell-based studies.
Evidence: early-stage — based on 3 studies in this database.
Benefits
Common myths
MythUrolithin C works the same way as urolithin A, just less well-known.
FactThese are distinct molecules studied in entirely different contexts — urolithin A is best known for its link to mitophagy and muscle health, while urolithin C has so far been studied mainly for its effects on glucose metabolism and insulin secretion.
MythEating pomegranates guarantees a high level of urolithin C in the body.
FactThe amount and proportions of urolithins produced depend heavily on an individual's gut microbiota composition (their metabotype) — some people may produce far less of a given urolithin than others, regardless of eating the same foods.
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Practice
Frequently asked questions
Unlike urolithin A, urolithin C is not currently a widely available, clinically tested supplement — the available data comes exclusively from preclinical studies.
No — pomegranates and other foods rich in ellagitannins don't contain urolithin C directly. It must form in the colon through the conversion of these compounds by gut bacteria, and the efficiency of this process varies between individuals.
There is currently no direct evidence linking urolithin C to aging-related mechanisms analogous to the mitophagy studied for urolithin A. Its potential relevance to longevity remains an open research question.
Safety
Side effects & contraindications
Possible side effects
Contraindications
No significant contraindications at typical doses.
Is it worth taking?
Who it's for
- People interested in the broader family of urolithin metabolites, not just the well-known urolithin A
- People following early research on plant polyphenols and gut microbiota metabolism
Not for
- No significant contraindications at typical doses.
Evidence
Worth knowing
Urolithin C forms via the same metabolic pathway as the better-known urolithin A, but is a distinct, far less studied molecule.
Research on urolithin C focuses mainly on its effect on insulin secretion and its antioxidant properties, rather than on mitophagy.
Studies
Urolithins, intestinal microbial metabolites of pomegranate ellagitannins, exhibit potent antioxidant activity in a cell-based assay
Early-stage evidenceKasimsetty SG, Bialonska D, Reddy MK, Thornton C, Willett KL, Ferreira D · Journal of Agricultural and Food Chemistry · 2009
A cell-based study comparing the antioxidant activity of different urolithins (A, B, C, D) and ellagic acid — showed strong antioxidant activity for urolithin C in in vitro tests.
View studyThe ellagitannin metabolite urolithin C is a glucose-dependent regulator of insulin secretion through activation of L-type calcium channels
Early-stage evidenceBayle M, Neasta J, Dall'Asta M, Gautheron G, Virsolvy A, Quignard JF, Youl E, Magous R, Guichou JF, Crozier A, Del Rio D, Cros G, Oiry C · British Journal of Pharmacology · 2019
A study on isolated pancreatic beta cells and islets showing that urolithin C enhances glucose-dependent insulin secretion by activating L-type calcium channels — a mechanism studied as a potentially safer alternative to classic insulin secretagogues.
View studyUrolithin C suppresses colorectal cancer progression via the AKT/mTOR pathway
Early-stage evidenceYang H, Wu B, Yang Q, Tan T, Shang D, Chen J, Cao C, Xu C · Journal of Natural Medicines · 2024
An in vitro and animal-model study showing that urolithin C inhibits proliferation and migration of colorectal cancer cells and arrests the cell cycle by blocking the AKT/mTOR pathway.
View studySources & bibliography
Citations are illustrative for this demo version and require full bibliographic verification by the editorial team before production publication.
Compare with similar entries
About the authors of this entry
Author
dr Anna KowalczykEditor-in-Chief, Molecular Biology
Anna studied molecular biology at the University of Warsaw, then spent eight years after her PhD in a lab researching the mechanisms of cellular aging and autophagy. She stumbled into science journalism almost by accident — frustrated by how easily her field's findings get oversimplified in the media, she started a blog explaining the biology of aging in plain language. That blog became the seed of VitMode. Today Anna oversees the entire editorial process, holding every piece to the same rigor her old lab demanded: primary sources, methodology checks, and honesty about the limits of the evidence. Outside work, she's a dedicated boulderer.
121 publications on this site
Medical review
dr Piotr ZielińskiEndocrinologist
Piotr has practiced endocrinology for more than fifteen years, mostly in male hormonal disorders and metabolic health. He joined VitMode as a scientific consultant because, as he jokes, he got tired of explaining the same testosterone questions at every appointment and decided to write the answers down properly, once. He reviews content on hormone therapy, supplement pharmacology and drug interactions, making sure articles never turn into encouragement to self-supplement in situations that genuinely need diagnostics and medical supervision. His professional motto — "evidence first, enthusiasm second" — has come up more than once with a patient who arrived with a supplement plan they found online.
174 publications on this site
Related entries
3.8Urolithin D
Urolithin D is the least-characterized but, in cell-based studies, the most potently antioxidant member of the urolithin family — compounds produced by gut bacteria from ellagitannins found in pomegranates, walnuts, and other foods.
4.0Mitophagy
A selective form of autophagy in which the cell recognizes and removes specifically damaged, dysfunctional mitochondria — a mitochondrial quality-control mechanism whose efficiency declines with age and is studied in the context of neurodegenerative disease.
4.3Autophagy
An intracellular 'housekeeping' process that clears out damaged proteins and organelles, whose discovery earned a Nobel Prize — one of the key mechanisms studied in the context of slowing aging.
4.05-AVAB
5-aminovaleric acid betaine (5-AVAB) is a small molecule produced by the gut bacterium Bifidobacterium pseudocatenulatum, whose levels decline with age — in mice, giving it reduced age-related inflammation and improved cognitive and motor function.
4.3Inflammaging
Chronic, low-grade, systemic inflammation that accompanies aging even without an active infection — a term coined in 2000 by Claudio Franceschi, today considered one of the fundamental mechanisms linking aging to age-related disease.
4.2TFEB
The transcription factor TFEB acts as a master on-off switch for autophagy and the production of new lysosomes in the cell — one of the best-characterized molecular nodes linking these two processes, studied as a potential target for interventions in aging.
4.2Immunosenescence
The progressive, multi-directional remodeling of the immune system with age — not a simple 'weakening,' but a complex change that both lowers the ability to fight new threats and raises the baseline level of inflammation.
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Comments (2)
- KW
Kasia W. 2 weeks ago
Very clearly explained, especially the interactions section — I hadn't seen it laid out this well anywhere else.
- MT
Marek T. a month ago
Are you planning to update this with the newest study from this year? I saw an interesting meta-analysis.