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Urolithin A

Overview

Urolithin A is a microbial metabolite formed when suitable gut organisms convert ellagitannin-derived ellagic acid. Pomegranate, walnuts and some berries can supply precursors, but the amount of Urolithin A formed varies substantially between people. Within BRAIN it is therefore represented as a downstream metabolite with a precursor-and-conversion pathway, not as an intrinsic constituent of those foods [1,4].

Research on mitophagy and mitochondrial resilience includes preclinical work and direct supplemental Urolithin A exposure. A human trial showed that oral Urolithin A can produce a molecular signature consistent with mitochondrial response, but this does not establish that precursor foods reliably reproduce the tested exposure [1,2]. Disease and cognition claims remain exposure- and model-dependent [3].

Dietary Context

The canonical dietary path is Pomegranate or another ellagitannin source → provides ellagitannins/ellagic acid → microbial conversion → Urolithin A. It is not Pomegranate → contains → Urolithin A. Producer status depends on microbial capacity, substrate exposure and host context.

Direct supplementation bypasses precursor conversion and produces a more controlled Urolithin A exposure [1,2]. That intervention relationship is distinct from dietary precursor exposure and must retain its supplemental context.

Research Spotlights & Evidence Checks

🔬 Research Spotlight · isolated-substance

Can direct Urolithin A supplementation bypass producer variability?

Direct oral Urolithin A produced systemic exposure and mitochondrial-response signals in a human trial, bypassing the need for variable microbial precursor conversion [1,2].

Read the evidence

The intervention tested Urolithin A itself rather than pomegranate or another ellagitannin-containing food. Its findings support direct-exposure research and cannot be silently projected to precursor foods [1,2].

🔎 Evidence Check · whole-food

Does pomegranate contain Urolithin A?

Not as represented in this framework. Pomegranate supplies ellagitannin precursors; microbiome-dependent conversion may subsequently produce Urolithin A [1,4].

Read the evidence

The Food relationship is explicitly recorded as a dietary-precursor edge. Pomegranate remains clickable as the source entity, while the relationship text preserves the conversion step and avoids a false contains assertion.

Foods

1 food

Pomegranates

Ellagitannins for urolithin A production and polyphenol support

Recipes

no recipes found (no foods contain this substance)

Biological Regulatory Systems

Biological Regulatory System	Evidence-qualified relationship	Evidence
Gut-Brain Axis & Enteric Nervous System (BRS5)	BRS5-FM2-PM6 represents microbial polyphenol biotransformation from dietary precursors to downstream metabolites such as Urolithin A	[1,4]
Mitochondrial Function & Bioenergetics (BRS4)	Direct Urolithin A exposure has mitophagy and mitochondrial-response evidence; dietary precursor exposure is not assumed equivalent	[1–3]
Inflammation & Oxidative Stress (BRS3)	Redox and inflammatory relevance remains model- and exposure-specific rather than a general pomegranate effect	[3]

References

[1] Singh et al. (2022). Direct supplementation with Urolithin A overcomes limitations of dietary exposure and gut microbiome variability in healthy adults. Establishes direct supplemental exposure as distinct from variable microbial production after precursor-food intake.

[2] Andreux et al. (2019). The mitophagy activator Urolithin A is safe and induces a molecular signature of improved mitochondrial and cellular health in humans. Human direct-exposure study supporting qualified mitochondrial-response claims.

[3] Hou et al. (2024). Urolithin A improves Alzheimer's disease cognition and restores mitophagy and lysosomal functions. Preclinical disease-model evidence relevant to mechanism but not equivalent to a human clinical or precursor-food outcome.

[4] Zelicha et al. (2022). The effect of high-polyphenol Mediterranean diet on visceral adiposity: the DIRECT PLUS randomized controlled trial. Whole-diet evidence involving microbiome-derived Urolithin A markers; it does not establish that pomegranate contains Urolithin A or isolate Urolithin A as the cause.