▲ Human lifespan evidence: no healthy-aging lifespan RCT — human evidence is randomized placebo-controlled RCTs with functional endpoints (muscle strength/endurance) and biomarker endpoints (mitochondrial gene signature, immune markers)

What it is

Class: Gut-microbiome metabolite; mitophagy activator

Also known as: Mitopure, UA

Relationship to mitochondrial health: Urolithin A is a metabolite that some people's gut bacteria produce from dietary ellagitannins (pomegranate, walnuts, berries). It is studied as a mitophagy inducer — promoting the selective clearance of damaged mitochondria — with downstream effects reported on muscle mitochondrial biomarkers and function.

Regulatory status

Sold as a dietary ingredient (Mitopure) with a US FDA GRAS notification for food use; not an approved drug and not approved for any anti-aging, longevity, or healthspan indication. GRAS food status is a safety/food-use pathway, NOT evidence of an aging benefit.

Mechanism

Induces mitophagy (clearance of damaged mitochondria) and is reported to shift a mitochondrial gene-expression signature; human trials measure muscle strength/endurance and mitochondrial or immune biomarkers. See /mitophagy.

Evidence — Human (randomized, placebo-controlled)

Species / population	Healthy or middle-aged/older adults across several RCTs (first-in-human safety cohort; middle-aged adults; adults 65-90; an age-related immune-decline cohort).
Exposure, route, schedule	Oral urolithin A (commonly 500-1000 mg/day) for weeks to months.
Comparator / duration	Placebo-controlled, randomized in the pivotal trials.
Endpoint / numeric result	Improved muscle strength and exercise/endurance measures and mitochondrial biomarkers (Singh 2022; older-adults 2022); safety and a mitochondrial gene signature first-in-human (Andreux 2019); immune-marker changes (2025).
What it did NOT establish	No healthy-aging lifespan or hard clinical outcome. Functional/biomarker gains do not establish extended human lifespan or disease prevention.

Evidence — Animal / invertebrate

Species / population	C. elegans and rodents (Ryu 2016).
Exposure, route, schedule	Dietary urolithin A.
Comparator / duration	Vehicle/untreated controls.
Endpoint / numeric result	Induced mitophagy, prolonged lifespan in C. elegans, and improved muscle function in rodents.
What it did NOT establish	Invertebrate lifespan and rodent muscle gains do not transfer to a human lifespan claim.

Negative or null findings

In the older-adults (65-90) trial, some endpoints (e.g. 6-minute walk distance and certain ATP measures) were not statistically significant even where an endurance-related measure improved.
No trial demonstrated a lifespan or hard clinical-outcome benefit; all human endpoints are functional or biomarker grade.

Urolithin A (Mitopure)