Urolithin A Dosage by Body Weight

Reviewed by SOMA HEALTH's Medical Research Team

It is a reasonable question: if medications are often dosed per kilogram of body weight, should a larger person take more urolithin A and a smaller person take less? The honest answer is that the human research does not work that way. Every published urolithin A trial used a flat, fixed dose — not a weight-scaled one.

This guide explains why supplement doses are usually fixed rather than scaled, what the urolithin A studies actually tested, when body size might be worth a thought, and how to think about your own dose sensibly. It is educational information, not personalized medical advice — for guidance specific to you, talk to your doctor.

What the human trials actually used

The most useful place to start is the evidence, because it is unusually clear on this point. In the human urolithin A studies, participants of varying body sizes all received the same fixed daily amounts:

Proven human evidence

Andreux 2019 in Nature Metabolism was the first-in-human study. It found urolithin A safe and well tolerated across single doses up to 1,000 mg per day and detected a mitochondrial gene-expression signature — all at fixed doses, not mg/kg. Singh 2022 in Cell Reports Medicine tested defined 500 mg and 1,000 mg daily arms in middle-aged adults over four months, reporting improvements in muscle strength and aspects of exercise performance. Liu and D'Amico 2022 in JAMA Network Open gave older adults a fixed daily dose for roughly four months and saw improved muscle endurance. In each case the dose was a set number, and it applied to everyone in the arm regardless of how much they weighed.

Newer human evidence

More recent work keeps the same flat-dose design. A 2024 randomized trial in the Journal of the International Society of Sports Nutrition ran an eight-week protocol in resistance-trained men at a fixed dose. A 2025 randomized trial published in Nature Aging gave a fixed dose over about 28 days and reported support for immune-cell mitochondrial health in midlife adults, a marker relevant to the low-grade inflammation of aging sometimes called inflammaging. A 2025 trial in distance runners followed the same fixed-dose convention. Across the human literature, the studied range is simply 500 to 1,000 mg per day, with 1,000 mg at the top — no weight adjustment anywhere.

Why supplements are usually dosed flat, not by weight

The idea that everything should be scaled to body weight comes largely from pharmacology, and even there it is more nuanced than people assume. Three points explain why a fixed urolithin A dose is the norm.

Weight-based dosing belongs to a specific context

Per-kilogram dosing is most common for drugs with a narrow margin between an effective dose and a problematic one, or in pediatrics where body sizes span an enormous range. Allometric scaling — the mathematics of adjusting dose across very different body sizes — was developed mainly to translate doses between species, such as from an animal study to a first human estimate, not to fine-tune between two adults. It does not automatically imply that a 90 kg adult needs proportionally more of a well-tolerated postbiotic than a 60 kg adult.

Urolithin A has a wide tolerability margin

The safety picture from Andreux 2019 — well tolerated up to 1,000 mg per day — means the compound does not behave like a drug where a small overshoot causes trouble. When a compound is well tolerated across the studied range, the practical reason to precisely weight-scale each person largely falls away. The trials chose 500 mg and 1,000 mg as meaningful, testable amounts, and both produced effects.

Absorption is gated by biology, not just body mass

Here is the part most weight-based reasoning misses. Urolithin A is a gut postbiotic: it is produced when gut bacteria convert the ellagitannins in pomegranate, walnuts and berries. Crucially, only some people carry the microbiome that makes this conversion efficiently, so dietary intake alone leaves many people with little urolithin A regardless of their size. This is a large reason direct supplementation exists at all — it bypasses the microbiome lottery. It also means the variable that matters most is not your weight but whether you are getting a verified, effective amount of the finished compound. You can read more in our urolithin A guide and on foods high in urolithin A.

Does body weight ever matter at all?

In principle, a larger body has a larger volume for any compound to distribute through, so it is not unreasonable to wonder whether a bigger person sees a slightly lower concentration from the same dose. But the trials were not designed to answer that, and no published urolithin A study reports a weight-adjusted dose or a dose-by-weight response. What the research does show is that the fixed amounts tested — particularly 1,000 mg — produced measurable effects across adults of different sizes. Until a study specifically tests scaling, inventing a personal mg/kg number would be guessing beyond the evidence, and that is exactly what we avoid.

How to think about your own dose

The practical takeaway is straightforward. Rather than trying to scale to your weight, aim to land within the studied range and stay consistent.

Match the studied range

The human evidence sits between 500 and 1,000 mg per day. Many people choose 1,000 mg because it is the amount tied to the strength and performance results and the top of what was tested for tolerability. For a fuller breakdown, see our page on urolithin A dosage.

Be consistent

The trials ran for weeks to months, not days. Mitochondrial changes accrue with steady daily intake, so consistency does more for your results than any weight calculation. A once-daily habit is easier to keep than a formula you have to recompute.

Choose a verified dose and involve your clinician

Because absorption depends partly on your own biology, the highest-leverage decision is picking a third-party tested product that genuinely contains its labeled amount. And if you have a medical condition, take medications, or are pregnant or nursing, discuss any new supplement with your doctor before starting — this is general education, not a treatment recommendation. Compare formats and top products on our best urolithin A gummies roundup.

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*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This guide is educational and is not a substitute for advice from a qualified healthcare provider.