Urolithin A: What It Is, How It Works and Who It's For

If you follow anything in the healthy ageing space, you've probably seen Urolithin A pop up. It's been called a "postbiotic", linked to mitochondria and talked about by longevity researchers. But what actually is it, and is it worth adding to your routine? Here's a plain-English guide.

What is Urolithin A?

Urolithin A is a compound your body can make in the gut. It isn't found ready-made in food. Instead, it's produced when your gut bacteria break down ellagitannins and ellagic acid, natural plant compounds found in foods like pomegranates, strawberries, raspberries and walnuts.

Because it's made by your gut microbes from something you eat, it's often described as a postbiotic: a beneficial compound produced by bacteria, rather than the bacteria themselves (probiotics) or the fibre they feed on (prebiotics).

Why most people don't make much of it

Here's the catch. Whether you turn pomegranate or walnuts into Urolithin A depends almost entirely on which bacteria live in your gut. Research suggests only around 40% of people produce meaningful amounts, and production tends to drop with age. So two people can eat exactly the same diet and end up with very different Urolithin A levels.

That's the main reason direct Urolithin A supplements exist: they skip the conversion step and provide the compound itself.

Mitochondria and mitophagy: the science in simple terms

Mitochondria are tiny structures inside your cells that produce most of the energy your cells use. Like any hard-working part, they wear out over time.

Your body has a built-in clean-up process for this called mitophagy: it identifies worn-out mitochondria, breaks them down and recycles them, making room for healthy new ones. Mitophagy is thought to slow down as we get older.

Urolithin A has attracted attention because laboratory and human studies have explored its relationship with mitophagy and mitochondrial function. Human studies have typically looked at doses between 500mg and 1,000mg a day, taken over several weeks to months, in healthy middle-aged and older adults.

Can you get enough from food?

You can (and should) still eat ellagitannin-rich foods. They're great for you regardless. But if you're not a "producer", eating more pomegranate won't necessarily raise your Urolithin A levels. And even for producers, the amount made from a typical diet is far below the doses used in research.

What to look for in a Urolithin A supplement

• The dose per serving. Check how much actual Urolithin A you get. Some "complex" or "stack" products list a big total number made up mostly of other ingredients.
• Purity, independently tested. Ask for third-party testing for purity and heavy metals, not just the manufacturer's word.
• A simple formula. Fewer fillers and added extras make it easier to know exactly what you're taking.
• Consistency. Studies run over weeks to months, so choose something you'll actually take every day.

GlowBelly Urolithin A

Our Urolithin A provides 500mg of Urolithin A in one capsule, taken once a day. It's been independently tested by Eurofins, with lab analysis confirming 99.7% purity, and tested for heavy metals. Each bottle has 90 veggie capsules, a full 90-day supply.

It pairs well with our Phosphatidylserine and Magnesium L-Threonate as part of a daily healthy-ageing routine. Explore the full range in Healthy Ageing & Antioxidants.

Quick FAQ

When should I take it?
Once a day with food is the simplest way to build the habit.

How long before I notice anything?
Urolithin A works at a cellular level, so think in months, not days. Most research runs for at least 4 to 16 weeks.

Is it safe?
Urolithin A has been well tolerated in human studies at the doses above. As with any supplement, speak to your healthcare professional first if you're pregnant, breastfeeding, under 18, taking medication or managing a health condition.

This article is general information only and isn't medical advice. Always read the label and follow the directions for use. If symptoms persist, talk to your health professional.