Trans-resveratrol: what it is and what the research shows

Resveratrol is a compound made by plants, found in grape skins, red wine, peanuts and some berries. It became well known in the 2000s after laboratory studies in yeast and mice drew wide attention.

The research in people tells a more cautious story. This article explains what resveratrol is, what happens to it in the body, and what human trials have found.

What resveratrol is

Resveratrol belongs to the polyphenols, a large group of plant compounds. More specifically, it is a stilbene, a type of polyphenol built from two linked ring structures. Plants produce it as a defence compound, in larger amounts when leaves are injured, infected or exposed to ultraviolet light.¹ It occurs in more than 70 plant species and is especially concentrated in the skin of red grapes.²

Amounts in food are small. Red wine usually contains about 1 to 4 mg of resveratrol per litre, and occasionally more than 10 mg.³

The molecule exists in two shapes, called trans and cis. The trans form predominates; heat, light and ultraviolet radiation can turn it into the cis form.²

How the body handles resveratrol

Resveratrol is well absorbed: in a study with six volunteers, at least 70 percent of a 25 mg dose was taken up by the body. The gut wall and the liver quickly attach sulfate or glucuronic acid groups to the molecule, so what circulates in the blood is mostly these converted forms, called metabolites, and only small amounts of unchanged resveratrol.⁴

Newer research suggests that these metabolites are not simply waste. Enzymes in tissues and in gut bacteria are thought to remove the attached groups again and release free resveratrol, so the metabolites circulating in the blood may serve as a reserve of the compound.⁵ In laboratory experiments, cells lining human blood vessels converted resveratrol metabolites back into free resveratrol.⁶

What research has looked at

Sirtuins. In 2003, researchers reported that resveratrol activated a sirtuin, one of a family of enzymes linked to the effects of calorie restriction, and extended the lifespan of yeast.⁷ The finding started a long scientific debate about how this activation works, and later research described a mechanism in which it depends on the shape of the target protein and on a specific site on the enzyme.⁸ In a 2023 study in healthy women and men aged 55 to 65, 500 mg of resveratrol a day for 30 days raised blood levels of the sirtuin SIRT1, as did a calorie-restricted diet in the comparison group.⁹

Mouse studies. Mice on a high-calorie diet that were given resveratrol lived longer than untreated mice on the same diet.¹⁰ In mice on a standard diet, resveratrol did not extend lifespan, but older animals given resveratrol showed fewer signs of age-related decline, including more elastic aortas, better motor coordination, fewer cataracts and better preserved bone density.¹¹

Human trials since 2016. The most detailed recent results come from randomised, placebo-controlled trials, in which neither participants nor researchers knew who received resveratrol:

• In 80 women after menopause, 75 mg twice a day for 14 weeks improved the ability of blood vessels in the brain to respond to demand by 17 percent compared with placebo. Verbal memory and overall cognitive performance also improved.¹²
• The same research group then followed 125 women after menopause for 24 months, each taking resveratrol for one year and placebo for the other. With resveratrol, overall cognitive performance improved by 33 percent, and blood flow in the brain and fasting insulin levels also changed favourably.¹³ In the same trial, bone mineral density in the lower spine and the hip increased compared with placebo, and a marker of bone breakdown fell by about 7 percent.¹⁴ The women also reported less pain, fewer physical menopausal symptoms and better general well-being.¹⁵
• In 30 healthy adults aged 65 to 80 who took part in a 12-week exercise programme, those who also took 500 mg of resveratrol a day gained more muscle strength, power and fatigue resistance, and more mitochondria (the energy-producing structures of cells) in their muscles, than those who exercised with a placebo.¹⁶
• In a pilot trial with 60 older adults with limited physical function, all of whom exercised for 12 weeks, walking distance in six minutes increased by 33 metres with 1,000 mg of resveratrol a day and by 9 metres with placebo. The researchers concluded that a larger trial is warranted.¹⁷
• In 30 older adults, high doses of 2 to 3 grams a day for six weeks improved blood vessel function and increased the number of mitochondria in muscle, although blood sugar control did not change.¹⁸

For skin, a 2025 trial in 134 women over 40 compared resveratrol capsules (150 mg a day), a resveratrol cream and both together for eight weeks. Wrinkle scores fell most when the capsules and the cream were used together, by about 12 percent, the only combination that differed clearly from placebo; capsules alone gave a smaller improvement.¹⁹

What the evidence shows overall

A 2026 umbrella review, which combined 45 systematic reviews of randomised controlled trials, found 35 significant associations between resveratrol and health measures, 27 of them rated as moderate or high certainty. The high-certainty findings were a smaller waist circumference, lower total cholesterol in adults with overweight, and lower blood pressure in people with type 2 diabetes. Findings of moderate certainty included working memory, the function of blood vessel walls and markers of inflammation.²⁰

Other pooled analyses point in the same direction. Across 17 studies, resveratrol improved flow-mediated dilation, a measure of how well arteries widen, by about 1.4 percentage points.²¹ Across 17 trials, it lowered TNF-alpha and hs-CRP, two markers of inflammation in the blood.²²

Not every trial has found the same effects. A 2025 analysis of ten trials in women after menopause confirmed lower pain scores and a lower marker of bone breakdown, but found no pooled change in cognitive performance or mood.²³

Safety

In the 12-month trial in women after menopause, 150 mg a day was well tolerated without apparent side effects.²⁴ A 2024 review of trials in older adults found that none of the studies reported significant adverse events.²⁵ Very high amounts can upset digestion: in the trial using 2 to 3 grams a day, three participants had severe digestive symptoms at 3 grams.¹⁸ At 1 gram a day, resveratrol also changed the activity of several liver enzymes that break down medicines, which could alter the effect of some drugs.²⁶

Open questions

• How much do the metabolites contribute to the effects seen in people?
• Will larger trials confirm the results on brain blood flow, cognition and bone in women after menopause?
• Can resveratrol support the benefits of exercise in older adults over longer periods?
• Which amounts and durations work best for which outcomes?

Sources

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This article is for general education about an ingredient and the research on it. It is not medical advice. If you have a health condition, are pregnant or breastfeeding, or take medication, talk to a doctor or pharmacist before taking food supplements.

Last reviewed: October 2026