Urolithin A
A postbiotic that triggers mitophagy — your body's process for clearing out damaged mitochondria and replacing them with healthy ones. Most people can't produce it naturally.
Urolithin A is a metabolite produced when certain gut bacteria ferment ellagitannins from pomegranates, berries, and walnuts. It activates mitophagy — the selective removal of damaged mitochondria — which is essential for cellular health and longevity. The problem: only about 30–40% of people have the right gut bacteria to produce it. Direct supplementation bypasses this limitation.
Good for you if: You're interested in longevity science, want to support mitochondrial quality control, notice declining muscle endurance with age, or take other mitochondrial supplements like CoQ10 or PQQ.
Dive deeper into the researchCommon side effects
- Mild GI changes in the first week
- Relatively new supplement — long-term data still emerging
- Expensive compared to most supplements
What does urolithin A do?
Think of your cells as a factory. Mitochondria are the power generators. Over time, some generators break down and start producing more waste (free radicals) than energy. If your body doesn't clear these damaged units, they accumulate and make the whole factory less efficient.
Urolithin A triggers mitophagy — the quality control process that identifies damaged mitochondria, breaks them down, and recycles the parts to build new, healthy ones. This is different from creating new mitochondria (biogenesis) — it's about removing the bad ones so the good ones can work better.
What can you expect?
- Improved muscle endurance — the most clinically demonstrated benefit
- Better cellular energy — cleaner mitochondrial pool means more efficient ATP production
- Reduced inflammation — clearing damaged mitochondria reduces DAMP-mediated inflammation
- Longevity potential — mitophagy is a core longevity mechanism in model organisms
How to take it
500–1,000 mg per day with food. Mitopure (by Timeline Nutrition) is the most-studied form, with clinical trial data at 500 mg and 1,000 mg doses.
Can be taken any time of day. Some people pair it with PQQ and CoQ10 for comprehensive mitochondrial support — urolithin A handles cleanup, PQQ creates new ones, CoQ10 fuels them.
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Get early accessFrequently Asked Questions
Can I get urolithin A from pomegranate juice?
Only if you have the right gut bacteria — and about 60–70% of people don't. Pomegranates contain ellagitannins, which specific gut bacteria (like Gordonibacter urolithinfaciens) convert into urolithin A. You can test your conversion ability by consuming pomegranate and checking for urolithin A in urine, but direct supplementation is more reliable.
Urolithin A vs NMN for anti-ageing — which is better?
They target different ageing mechanisms. Urolithin A activates mitophagy (clearing damaged mitochondria), while NMN boosts NAD+ levels (fuelling energy metabolism and sirtuin activity). They're complementary, not competing. Many longevity-focused people take both. If choosing one, consider your primary concern: cellular cleanup (urolithin A) vs energy metabolism (NMN).
How long does urolithin A take to work?
The Mitopure clinical trials showed measurable improvements in muscle endurance biomarkers after 4 months. Cellular-level changes (improved mitophagy markers in muscle biopsies) were detectable at 2–4 months. Subjective energy improvements may come sooner, but this is a long-term intervention.
Is urolithin A worth the cost?
Urolithin A is one of the more expensive longevity supplements (roughly ₹4,000–8,000/month for quality brands). The clinical data is promising but still emerging. If you're already optimised on foundational supplements (D3, omega-3, magnesium, CoQ10) and want to add a longevity-specific compound, urolithin A is a reasonable next step.
How it works in your body
Urolithin A activates mitophagy through the PINK1/Parkin pathway and through AMPK activation. PINK1 accumulates on the outer membrane of damaged mitochondria with low membrane potential, recruiting Parkin (an E3 ubiquitin ligase) to tag these mitochondria for autophagic degradation.
Urolithin A also upregulates BNIP3L/Nix and FUNDC1, additional mitophagy receptors that provide PINK1/Parkin-independent mitophagy pathways. This multi-pathway activation ensures thorough mitochondrial quality control. In model organisms, this translates to increased lifespan — C. elegans treated with urolithin A showed 45% lifespan extension.
What the studies show
- Muscle endurance: 1,000 mg/day of Mitopure improved muscle endurance by 12% after 4 months in sedentary older adults (JAMA Network Open, 2022)
- Mitophagy markers: Muscle biopsies showed increased mitophagy gene expression and improved mitochondrial respiration
- Bioavailability: Plasma urolithin A levels peaked at 2–4 hours post-ingestion, with a half-life of about 17 hours
- Safety: No adverse effects vs placebo in trials lasting up to 4 months at doses up to 2,000 mg/day
Side effects & safety
Clinical trials show urolithin A has a clean safety profile:
- GI changes — Mild changes in stool consistency in the first week for some people. Not clinically significant.
- Limited long-term data — The longest published trial is 4 months. Long-term safety beyond this is extrapolated but not yet confirmed.
- Cost — While not a side effect, the high cost (~₹5,000–8,000/month) can be a barrier for sustained use.
Who should wait: Anyone on tight budgets should prioritise foundational supplements first. Pregnant or breastfeeding women should avoid (insufficient safety data). People on immunosuppressants should consult their doctor (mitophagy influences immune cell function).
Which labs to check
- Urolithin A blood test — if available, confirms you're achieving therapeutic levels
- hsCRP — tracks inflammatory improvement from better mitochondrial quality
- GDF-15 — emerging mitochondrial stress marker
- Muscle strength/endurance testing — functional assessment
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