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Resveratrol is a plant compound found in grape skins, red wine, peanuts and some berries, and it became famous after lab studies linked it to longer life in yeast, worms and mice. Human research has been far less exciting. Your body absorbs resveratrol well but breaks it down so quickly that very little reaches the bloodstream unchanged, and controlled trials in people have produced mixed, mostly small results. Here is what resveratrol is, where it comes from, what the studies actually found, and the side effects and drug interactions worth knowing.
Peptide Labs sells two multi-ingredient products that list resveratrol, described below, but this article does not recommend them or any other product. It is general information, not medical advice.
Key Takeaways
- Resveratrol is a polyphenol from the stilbene family, found in grape skins, peanuts, cocoa and some berries.
- Most US resveratrol supplements are made from Japanese knotweed root rather than grapes.
- It is well absorbed but rapidly metabolized, so only traces of unchanged resveratrol reach the blood.
- Lifespan findings come from yeast, worms, flies and mice; no human data link resveratrol to longer life.
- It may raise bleeding risk with blood thinners and can affect liver enzymes that process many medicines.
What is resveratrol?
According to the Linus Pauling Institute at Oregon State University, resveratrol is a polyphenol in a class called stilbenes. Plants make it in response to stress, injury, fungal infection or ultraviolet light. Scientific interest took off in the early 1990s, after researchers found resveratrol in red wine and wondered whether it helped explain the so-called French paradox, the observation that heart disease rates in France were relatively low despite a diet high in saturated fat.
Resveratrol exists in two shapes, trans and cis. Trans-resveratrol is the form most studied and the one usually named on supplement labels. In grapes, much of it is bound to a sugar as a compound called piceid, and fermentation releases more of the free form into wine.
Food and supplement sources
In grapes, resveratrol sits only in the skins, and levels vary widely with the grape variety, growing conditions and fungal exposure. The Linus Pauling Institute lists these sources:
| Source | What to know |
|---|---|
| Red grapes and grape juice | Found in the skins; amounts vary by variety and growing conditions |
| Red wine | Contains more free resveratrol than juice; amounts in a glass or two are small |
| Peanuts and peanut butter | Small amounts, raw or boiled peanuts included |
| Cocoa and dark chocolate | Listed as a food source |
| Blueberries, bilberries, cranberries | Berries of the Vaccinium family |
| Japanese knotweed root | The source of most US resveratrol supplements |
Most resveratrol supplements sold in the US use extracts of Polygonum cuspidatum root, also called Fallopia japonica, Japanese knotweed or Hu Zhang. Red wine and grape extracts are also sold. The Institute notes that it is not known whether any amount of supplemental resveratrol is safe and effective for chronic disease prevention, and it does not suggest drinking wine for resveratrol.
Why so little resveratrol reaches the blood
A 2004 study in six volunteers, published in Drug Metabolism and Disposition, found that at least 70% of an oral amount was absorbed, yet only trace amounts of unchanged resveratrol showed up in the blood. The intestine and liver rapidly attach sulfate and glucuronide groups to it, and most is excreted in urine. The authors described this as high absorption but very low bioavailability.
This matters because much of the exciting resveratrol research was done in cells, at concentrations the Linus Pauling Institute says can be up to 100 times higher than peak levels measured in people. Some metabolites may have their own activity, but a result in a dish does not tell you what a capsule will do in a person.
Resveratrol benefits: what human studies found
Claims about resveratrol benefits usually start with animal research. In yeast, resveratrol boosted an enzyme called Sir2, a sirtuin, and extended replicative lifespan. It also extended lifespan in worms, fruit flies and one fish species, and it let mice on a high-calorie diet live about as long as mice on a standard diet. Those results drew heavy commercial interest: in 2008 GlaxoSmithKline agreed to acquire Sirtris Pharmaceuticals, a company developing compounds meant to activate the human sirtuin SIRT1, including a resveratrol formulation called SRT501.
Human results have been much more modest. The Linus Pauling Institute points out that the concentrations needed to activate SIRT1 in a test tube are far higher than those reached in human blood, and that no population data link resveratrol to longer human life. A few key studies show the range of findings:
- Obese men, 30 days: a 2011 crossover trial in 11 healthy obese men reported lower resting metabolic rate, lower liver fat and small changes in blood sugar, triglycerides and blood pressure. One author worked for DSM, the company that makes the resveratrol ingredient tested.
- Nonobese women, 12 weeks: a 2012 randomized trial in postmenopausal women with normal blood sugar found no change in body composition, metabolic rate, blood lipids, inflammation markers or insulin sensitivity, and no effect on SIRT1 in muscle or fat.
- Older adults in Chianti, 9 years: a 2014 cohort study of 783 Italians aged 65 and older found that resveratrol levels from diet were not linked to inflammation, heart disease, cancer or death from any cause.
Many other small trials have looked at blood pressure, blood sugar, inflammation and thinking skills, with mixed results and different products. Overall, the evidence does not show that a resveratrol supplement improves health outcomes in people, and it offers no proof of any effect on aging.
Resveratrol side effects and safety
The Linus Pauling Institute says resveratrol is not known to be toxic to humans, but controlled trials are few. Memorial Sloan Kettering Cancer Center (MSKCC) and the Institute list these cautions:
- Stomach upset: nausea, abdominal pain, gas and diarrhea have been reported at high intakes.
- Bleeding: resveratrol slows platelet clumping in lab studies, so it could add to bleeding risk with warfarin, heparin, clopidogrel, aspirin and other NSAIDs. MSKCC advises talking with your provider if you take blood thinners.
- Medicine metabolism: in healthy volunteers, resveratrol inhibited several liver enzymes, including CYP3A4, which handles many drugs such as some statins and calcium channel blockers.
- Hormone-sensitive conditions: resveratrol has estrogen-like activity in lab studies, and the Institute advises women with a history of breast, ovarian or uterine cancer to avoid the supplements until more is known.
- Pregnancy and breastfeeding: safety has not been established.
There is also a cautionary chapter from drug development. MSKCC notes that a study of a high-strength micronized resveratrol formula, SRT501, in people with multiple myeloma was stopped because of serious adverse events that included kidney failure. That was a sick population on cancer drugs, not healthy supplement users, but it shows that large amounts of a natural compound are not automatically harmless. Interactions follow the same logic as other polyphenols; our guides to turmeric and black pepper and nattokinase cover similar liver-enzyme and bleeding questions.
Reading a resveratrol supplement label
A resveratrol supplement should name the form (often trans-resveratrol) and the source, such as Japanese knotweed root or grape extract. Resveratrol is also a common add-in to blends, where it sits next to many other ingredients. Two examples from our catalog:
- AKKA Akkermansia Probiotic lists milk thistle seed extract, artichoke leaf extract, quercetin, resveratrol and an Akkermansia muciniphila strain counted in TFU. The label asks people who are pregnant, nursing, taking medication, living with a medical condition or a weakened immune system to ask a healthcare professional first.
- Etta Vita GLP-1 Support Supplement lists resveratrol from Japanese knotweed root among 11 ingredients, including berberine, grape seed extract, decaffeinated green tea extract, inulin and two bacterial cultures. The brand states it is not a substitute for any GLP-1 medication and asks people who take medication to speak with a physician.
In blends like these, the other ingredients often carry their own cautions. Berberine and green tea extract have interaction and liver questions of their own, so read our guides to quercetin, milk thistle, Akkermansia and GLP-1 support supplements before you add one. Independent testing helps confirm what is in the bottle; see our guide to third-party tested supplements. If you are also curious about other compounds sold with big claims, our SAM-e guide shows how a supplement with decades of research can still lack firm answers.
Frequently Asked Questions
What is resveratrol?
A plant polyphenol from the stilbene family, found in grape skins, red wine, peanuts, cocoa and some berries. Most supplements are made from Japanese knotweed root.
What are the proven resveratrol benefits?
None are firmly established in people. Animal and cell studies were promising, but human trials are small, short and mixed, and resveratrol is broken down quickly after you swallow it.
What are common resveratrol side effects?
Nausea, stomach pain, gas and diarrhea have been reported at high intakes. It may also add to bleeding risk with blood thinners and change how some medicines are processed.
Is trans-resveratrol better than resveratrol?
Trans-resveratrol is the form most studied and the one most labels name. It is not proven to produce health effects in people either.
Can I get resveratrol from red wine?
Red wine contains small amounts, and alcohol carries its own risks. The Linus Pauling Institute says there is no convincing evidence that the amounts in one or two glasses benefit the heart.
Who should avoid a resveratrol supplement?
People who are pregnant or breastfeeding, take blood thinners or many prescription drugs, have a history of hormone-sensitive cancer, or have surgery coming up should ask a clinician first.
Questions about a label? Contact us or read our Buyer’s Guide. Follow the label and ask a healthcare provider before starting any supplement, especially if you take medicines or are pregnant. 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.
Last reviewed October 2026.
Related guides: Quercetin: Benefits, Side Effects, Interactions and Bromelain Combos, NMN Supplement: FDA Status, Research and Side Effects, Third Party Tested Supplements: What USP, NSF and Other Seals Mean.