Urolithin A: How Our Gut Microbes Turn Pomegranates into a Booster of Cellular Health

What is Urolithin A?

Urolithin A is a compound produced in the gut when certain microbes break down ellagitannins, a type of polyphenol found in foods like pomegranates, berries, and walnuts. Not everyone produces urolithin A efficiently, because it depends not only on your diet but also on particular microbial community living in your gut.

Over the past decade, research has shown that urolithin A plays a key role in cellular energy generation and longevity by stimulating a process called mitophagy, essentially the “recycling” and renewal of old or damaged mitochondria, the powerhouses of our cells (for an in depth discussion of the crucial role of mitochondria in cellular energy production (Podcast Episode with Martin Picard, PhD).

Healthy mitochondria = better energy, endurance, and resilience against age-related decline.

What the Science Says

• Mitochondrial Health: Clinical trials show urolithin A supplementation improves mitochondrial function, which may enhance cellular energy production and slow aspects of the aging process (Ryu et al., 2016, Nature Medicine).
• Muscle Endurance: Human studies report that urolithin A supplementation can improve muscle strength and endurance in both older adults and less-active individuals (Andreux et al., 2019, Cell Reports Medicine).
• Anti-Inflammatory Effects: Urolithin A has been shown to reduce markers of inflammation, a key driver in many chronic diseases.

This makes urolithin A one of the most promising postbiotics, beneficial compounds made by the microbiome for our health.

Food Sources

One of the richest sources of ellagitannins (the precursors for urolithin A) is pomegranate. The highest concentration of this group of polyphenols is found in the peel. In fact, pomegranates have been studied for decades for their unique ability to fuel the gut microbes that generate this powerful compound.

At Mayer Nutrition, we made sure to include pomegranate extract in Synaptic Bloom, our polyphenol blend. By providing ellagitannins, pomegranate can help support your microbiome in producing urolithin A naturally, a great example of how feeding your gut (as a postbiotic) also fuels your cells.

How to Support Urolithin A Production

Since not everyone’s gut microbes are equally equipped to make urolithin A, the best approach to optimize urolithin production in your gut is to:

• Eat foods rich in ellagitannins: pomegranates, walnuts, berries
• Support gut microbial diversity with a plant-rich diet
• Consider targeted polyphenol supplementation to provide consistent precursors

Main Takeaways

Urolithin A is a perfect example of how deeply interconnected our diet, gut microbiome, and health truly are. It bridges what you eat with how your cells function, influencing energy, muscle strength, and long-term resilience.

By nourishing your gut with ellagitannin-rich foods like pomegranates, or with a diverse polyphenol supplement like Synaptic Bloom, you’re giving your body the raw materials it needs to unlock the benefits of urolithin A.