Resveratrol vs Urolithin A
Written by Aaron CuhaReviewed Sep 2026
The short answer
Two plant compound based longevity supplements with opposite absorption stories. Resveratrol is changed by the body so fast that very little of it stays in the blood, below the levels used in dish studies. Urolithin A is itself made by gut bacteria.
- Resveratrol people
- 403
- Resveratrol nulls
- 8
- Urolithin A people
- 0
- Urolithin A nulls
- 1
Dose
No human dose established
Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose.
14 completed trials, 403 people given it
Dose
No human dose established
Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose.
2 completed trials, 0 people given it
First-hand reports are counted on each profile and never added together. This page sets two published records side by side. It does not pick a winner.
Column A
ResveratrolResveratrol (trans-3,5,4'-trihydroxystilbene)
Resveratrol is the grape and red wine compound behind the first big wave of anti-ageing research. It is one of the most tested supplements on this site, with over 150 finished registered studies. The results conflict, and they split by who took it and how much, rather than pointing one way. No trial in people has measured lifespan or any hard health result like heart attacks or death.
Column B
Urolithin AUrolithin A
A compound your gut makes from pomegranates and berries. In older adults it helped muscle stamina and strength on some tests, and missed on others. It is sold as a supplement.
Side by side, on the facts we can check
| What we compare | Resveratrol | Urolithin A |
|---|---|---|
| Category | Longevity | Muscle & Performance |
| FDA status | Dietary supplement; not an approved drug. Labels may say how it supports the body, with the disclaimer the US supplement law requires, but may not claim to treat or prevent a disease | Sold as a supplement (generally recognized as safe, or GRAS); not an approved drug |
| Half-life | About 9 hours for resveratrol plus its sulfate and glucuronide conjugates after an oral dose; free parent compound is cleared far faster | Several hours |
| Molecular weight | 228.24 Da | 228.2 Da |
| How it works | The main idea is that resveratrol switches on SIRT1, an enzyme that needs NAD+ to work. That in turn sets off signals, AMPK and PGC-1alpha, that copy parts of eating less. That claim is disputed. Teams at Amgen (2009) and Pfizer (2010) showed the switch-on only happened with a glowing tag stuck to the test protein. It vanished with natural proteins. Sirtris and Sinclair's group answered in Science (2013). They argued the switch-on is real, but only with target proteins that carry certain water-avoiding patches, plus one spot on SIRT1, Glu230. Apart from sirtuins, resveratrol is a known antioxidant. It helps blood vessels widen through nitric oxide. And at gram doses it blocks the liver enzymes CYP3A4, CYP2D6 and CYP2C9, which break down many prescription drugs. | It turns on mitophagy. That is the cell's way of clearing out broken mitochondria, the parts that make energy. The result is a better energy supply, mostly in muscle. |
| Studies in people | 14 | 3 |
| Evidence | Moderate: 14 completed trials, 403 people given it | Limited: 2 completed trials, none stating how many people |
| Legal status, US | Sold as a dietary supplement; not an approved drug | Sold as a dietary supplement |
Frequently asked questions
What is the difference between Resveratrol and Urolithin A?
Resveratrol: Resveratrol is the grape and red wine compound behind the first big wave of anti-ageing research. It is one of the most tested supplements on this site, with over 150 finished registered studies. The results conflict, and they split by who took it and how much, rather than pointing one way. No trial in people has measured lifespan or any hard health result like heart attacks or death. Urolithin A: A compound your gut makes from pomegranates and berries. In older adults it helped muscle stamina and strength on some tests, and missed on others. It is sold as a supplement.
Which has stronger research evidence, Resveratrol or Urolithin A?
Each compound gets a band worked out from facts we counted, with the math shown. Resveratrol is Moderate (14 completed trials, 403 people given it). Urolithin A is Limited (2 completed trials, none stating how many people). That counts how much has been done in people. It does not rate whether either one works, and neither one is called the winner.
Are Resveratrol and Urolithin A FDA-approved?
Resveratrol: Dietary supplement; not an approved drug. Labels may say how it supports the body, with the disclaimer the US supplement law requires, but may not claim to treat or prevent a disease. Urolithin A: Sold as a supplement (generally recognized as safe, or GRAS); not an approved drug.
Reviewed Sep 2026. This page puts two published records side by side. It is for learning, and it is not medical advice. When this site shows a dose, it is the dose a trial or a clinic actually used, or what people say they did, with the source attached. None of it tells you what to take.