The trendy antiaging supplement, put to the test

New study

This is one study, not a conclusion. Still, it puts a popular product to the test. Urolithin A is sold as a way to keep your mitochondria healthy, the tiny power plants that make energy inside every cell. Researchers wanted to know whether a month of it would improve how well the arteries of middle-aged adults work.

What urolithin A is, and why everyone is talking about it

You don't get urolithin A straight from your plate. Gut bacteria make it out of compounds found in pomegranates, walnuts and raspberries, and not everyone's gut makes the same amount. That gap is the pitch behind the capsules: take the finished molecule and skip the guesswork.

Women's Health covered the supplement in November 2025, after a small study in healthy middle-aged adults found shifts in immune markers linked to aging. The magazine pointed out that the company behind one of these supplements had funded that work, which left room for an independent trial.

What the Oklahoma team tested

The trial, by da Costa Pinaffi-Langley and colleagues at the University of Oklahoma, appeared in JAMA Network Open in October 2026. It enrolled 50 adults aged 40 to 64 with obesity, meaning a body mass index of 30 or higher. Their average age was just under 51, and 37 were women.

Half were randomly assigned to 1,000 milligrams of urolithin A a day and half to a placebo, an identical capsule with nothing active in it. Neither the volunteers nor the researchers knew who got which. After four weeks, the main test was flow-mediated dilation: how much the artery in the upper arm widens when blood flow picks up, a standard check on blood vessel health.

What the trial found

The artery didn't improve. Dilation changed by 0.3% with the placebo and 1.3% with urolithin A, and the analysis found no significant difference between the two, so the gap could simply be chance. Other measures of blood flow in the hand and fingertips didn't budge either.

There was one signal elsewhere. During mental tasks, blood flow in the brain responded more strongly in the supplement group. Yet both groups scored the same on those tasks, so it didn't show up as sharper thinking. The authors flag it as something worth studying further.

The capsules were well tolerated, the researchers report, and seven of the 50 people who started dropped out before the end.

What the wider evidence says

There isn't much to stack this against. In July 2026, Frontiers in Nutrition published a systematic review and meta-analysis by Dao and colleagues on urolithin A and muscle. They found only 5 trials with 236 people in total, all small, short and run in very different groups.

Just two of those trials could be pooled, both measuring how far people walk in six minutes. The average gain was about 17 meters, and the result wasn't conclusive. The authors rate their confidence in that evidence as low. An earlier systematic review, in Ageing Research Reviews in 2024, saw an anti-inflammatory effect and gains in muscle strength and endurance, but no effect on heart and blood vessel health or on physical function.

The limits of this study

First, who was studied: 50 adults aged 40 to 64 with obesity, most of them women, all at a single US site. If you're at a healthy weight or already exercise regularly, these results may not describe you.

Second, how long it lasted: the trial ran for four weeks. That's short, so a slower effect can't be ruled out. Third, who paid for it: the American Heart Association and the Reynolds Foundation funded the work and played no part in the design or analysis, and the authors report no conflicts of interest. Fourth, the findings have not been replicated in another group of people yet.

Before you buy the bottle

None of this proves urolithin A is useless: it shows that, in these adults and over one month, it didn't improve the arteries, which is what the trial measured. And the muscle review says five small trials aren't enough to claim anything yet.

Exercise, on the other hand, has whole meta-analyses behind it. Just two sprints a session will build fitness, and we've covered what's known about strength and biological age. For any antiaging capsule, three questions help: is there a meta-analysis showing an effect on the thing you care about, who paid for the study in the ad, and what will you give up to buy it?

If you want to try it, it's wise to check with your doctor first, especially if you take any medication. Pick a time frame and one clear measure, like your blood pressure or how you handle the stairs, so you can tell whether anything changes. And try not to take that time out of your workouts, since that's where the weight of the evidence is.

At Gym Triple X we think of it as an order of priorities: the week's strength and cardio sessions come first, then what's on your plate, and only last, if at all, the bottle on the shelf.

If it's hard to tell what deserves your time, a personal trainer on the Costa del Sol can help you plan your week so the effort goes where it actually shows, at your own pace and with no strings attached.