Resveratrol
Also known as: Trans-resveratrol, Japanese knotweed extract, Polygonum cuspidatum extract
The red-wine polyphenol of longevity fame — impressive in worms and mice, unproven in humans.
Resveratrol is a polyphenol produced by grapes and other plants under stress — the compound behind the 'red wine is good for you' narrative. It activates sirtuins, the cellular proteins linked to longevity in laboratory organisms, and high-dose animal studies showed striking healthspan effects. Human trials have been far more modest: no cardiovascular or longevity benefit has been established, and most healthy people get little measurable effect at supplement doses.
- Plant polyphenol found in grape skins, red wine, and Japanese knotweed
- Activates sirtuins — the longevity proteins of lab fame
- Animal results were striking; human trials remain modest
- Poor bioavailability; doses used in humans are far below animal studies
What is Resveratrol?
Few supplements have a more dramatic origin story than resveratrol: it became a celebrity when researchers found it extended the lifespan of yeast, worms, and — in high doses — overweight mice, activating the same sirtuin pathways as calorie restriction. The translation to humans has been humbling. Supplement doses achieve a fraction of the blood levels used in animals, and clinical trials show modest effects on some blood markers at best. Resveratrol remains a fascinating molecule in search of a proven human indication.
Where it comes from
Natural sources
- Grape skins and red wine
- Blueberries, cranberries, and peanuts
- Japanese knotweed (the main supplement source)
How it's made
Supplements extract trans-resveratrol from Polygonum cuspidatum (Japanese knotweed) or synthesize it.
What it does in products
Benefits
Cardiovascular protection
limited evidenceDespite the red-wine hypothesis, human trials have not shown meaningful cardiovascular event reduction, and some trials found no improvement in heart-disease biomarkers.
Glucose metabolism
moderate evidenceSome trials in type 2 diabetes report modest improvements in insulin sensitivity and HbA1c with 1 g daily — the most consistent human signal, though small.
Longevity in humans
limited evidenceNo human evidence supports lifespan extension. Blood-marker studies are interesting but far from proving the animal findings translate.
Skin and anti-aging
limited evidenceTopical resveratrol appears in anti-aging products with laboratory support; clinical skin evidence is thin.
Side effects & safety
Safety considerations
- Avoid supplements in pregnancy; red-wine sources are obviously not recommended either.
- May add to blood-thinning effects of warfarin and aspirin.
- High doses could affect drug metabolism via liver enzymes (theoretical).
- Not for: Hormone-sensitive cancers (resveratrol has estrogenic activity in some models)
- Not for: Planned surgery (stop 2 weeks prior)
Amounts studied & product use
These figures describe research or common product use, not a personal dose or treatment recommendation.
In supplement studies and products
Common doses: 250–500 mg daily. Diabetes trials used 1,000 mg daily. Bioavailability is low, so micronized and liposomal forms are marketed — independent comparative data remain limited.
Regulatory status
- Dietary supplement under DSHEA; resveratrol is GRAS as a food ingredient in some applications.
- GRAS (generally recognized as safe) for food use.
Why the animal studies misled everyone
The famous mouse studies used doses equivalent to grams per day in humans — orders of magnitude above supplement doses — and even those effects appeared mainly in obese animals. Resveratrol's poor oral bioavailability compounds the gap: most of a pill is metabolized before reaching tissues. This is the central lesson of resveratrol: exciting molecules do not automatically become effective supplements.
Frequently asked questions
Does resveratrol extend human lifespan?
No human evidence supports that. Lifespan effects exist in yeast, worms, and — at very high doses — some mouse models. In people, resveratrol has not been shown to extend life or prevent age-related disease.
Should I drink red wine for resveratrol?
No — the resveratrol dose in wine is tiny, and alcohol's harms outweigh any theoretical benefit. Any cardioprotective signal from wine is dwarfed by better-evidenced habits like exercise and not smoking.
Who might benefit from resveratrol?
The most consistent human data is modest glucose-metabolism improvement in type 2 diabetes at gram doses. For healthy people, the current evidence does not justify routine supplementation.
The bottom line
Resveratrol is a superb laboratory molecule and an unproven human supplement. Its best (still modest) evidence is in diabetes at high doses; the longevity claims remain animal science. Interesting, safe, and not yet worth the hype.
References
- Red Wine and Resveratrol. NCCIH (National Institutes of Health)
- Resveratrol compound summary. PubChem (National Library of Medicine)
- Resveratrol and glucose metabolism — literature search. PubMed (National Library of Medicine)
- Resveratrol in humans (clinical review). PubMed (National Library of Medicine)