What is Urolithin A?
Urolithin A is a naturally occurring compound formed in the gut when gut bacteria break down ellagic acid, a polyphenol found in foods such as fruits and berries. Urolithin A activates the body’s own mechanisms to remove damaged mitochondria while simultaneously stimulating the formation of new, healthy mitochondria. This can contribute to improved energy production, muscle endurance, cellular longevity, and recovery. That’s why Urolithin A is often called the so‑called “anti‑aging molecule.”
What is mitophagy?
Mitophagy is your cells’ system for cleaning up mitochondria, the small engines that power your body. Mitophagy removes damaged mitochondria and replaces them with new and efficient mitochondria. Robust and strong mitophagy means better energy, faster recovery, lower inflammation, and healthier aging. Weak or poor mitophagy leads to fatigue, a slow metabolism, and cellular decline. The primary role of the supplement Urolithin A is to increase mitophagy.
The problem with Urolithin A?
Most products marketed as “Urolithin A” are, in practice, mislabeled or misleading. Currently, it’s estimated that 60–95% of the market consists of products that either contain no Urolithin A at all or are marketed in a misleading way. Many of these contain only ellagic acid or pomegranate extract, yet are sold as Urolithin A. To claim that such products “increase Urolithin A naturally” is misleading, because only about 35% of the population has gut bacteria that can actually convert ellagic acid into Urolithin A. What can you do instead to boost mitophagy?
How to increase mitophagy without Urolithin A?
Exercise (HIIT and strength training)
Exercise activates signaling pathways such as AMPK and PGC‑1α, which stimulate the clearance of damaged mitochondria and the creation of new, more efficient mitochondria.
Intermittent fasting / time-restricted eating window
Fasting activates the body’s own processes for autophagy and mitophagy. An eating window of 14–16 hours works well, while longer fasts of 24–36 hours generally produce a stronger activation.
Ketosis / low-carb phases
When carbohydrate availability drops, cellular fat burning increases and processes that clear out damaged mitochondria are upregulated. Even shorter periods on a low‑carb diet can trigger this effect.
Cold exposure (ice baths or cold showers)
Cold activates signaling molecules that stimulate mitochondrial turnover in both brown fat and skeletal muscle. As little as 2–4 minutes at roughly 5–15 °C may be enough to have an effect.
Heat (sauna)
Sauna bathing activates so‑called heat shock proteins, which help repair and remove damaged mitochondria and thereby rapidly stimulate mitophagy.
Polyphenols that support mitophagy
Certain polyphenols can support mitochondrial clearance and renewal, including resveratrol, quercetin, EGCG, and fisetin. However, their effects are generally weaker compared to Urolithin A.
Supplements that work for mitophagy
- Resveratrol: 150–300 mg per day
- Quercetin: 100–500 mg per day
- EGCG (green tea extract): 100–300 mg per day
- Fisetin: 100–200 mg per day
- Pterostilbene: 50–150 mg per day
- NRC for NAD⁺: 300 mg per day (NRC supports the body’s NAD⁺ levels, which in turn can activate the sirtuins SIRT1, SIRT3, and SIRT6. They are central regulators of autophagy, mitochondrial biogenesis, and cellular repair.)
Gut microbiota and Urolithin A
The body cannot produce Urolithin A on its own. Only certain specific gut bacteria can convert ellagic acid from foods such as pomegranate and berries into Urolithin A. The challenge is that only about 30–40% of the population has these bacteria, primarily Gordonibacter and a few rare species within the Eggerthellaceae family. If these bacteria are absent, no Urolithin A is formed at all, regardless of how many pomegranates or berries you consume.
What do these terms mean?
Polyphenol
Natural plant compounds found in fruits, berries, tea, and herbs. They act as protective bioactive substances in the body and can influence cellular stress and repair systems.
Mitochondria
The cell’s “powerhouses” that produce energy in the form of ATP. Their quality and function are crucial for energy, aging, and cellular health.
AMPK
An energy‑sensing enzyme activated when the cell’s energy levels are low. It functions as a master switch that initiates fat burning, autophagy, and energy conservation.
PGC-1α
A key regulator of mitochondrial biogenesis. It signals the cell to create more and more efficient mitochondria, especially during exercise and metabolic stress.
Autophagy
The cell’s own recycling system in which old or damaged components are broken down and reused. This is a fundamental process for cellular health and long‑term function.
Mitophagy
A specialized form of autophagy that selectively removes damaged mitochondria. It ensures the cell’s energy production remains efficient and oxidative stress stays low.
Signaling molecules
Chemical messengers that cells use to communicate with each other. They govern how cells adapt to stress, nutrition, exercise, and temperature.
Heat shock proteins
Protective proteins activated by heat, exercise, or other stressors. They help repair, stabilize, and remove damaged proteins and cellular structures.
Gordonibacter
An uncommon group of gut bacteria that can convert ellagic acid from certain foods into Urolithin A. Only a portion of the population has these bacteria in their gut microbiota. Gordonibacter can not be increased via probiotics.
Eggerthellaceae family
A family of gut bacteria in which certain species have the ability to metabolize polyphenols. A few of these species are involved in the formation of Urolithin A. The Eggerthellaceae family can not be increased via probiotics.
