Resveratrol benefits and side effects: what the evidence shows in people

Resveratrol is a compound some plants make to fend off fungus and stress, found in grape skins, red wine, peanuts, berries and the root of Japanese knotweed. It became famous after lab work linked it to longer life in yeast, worms and flies, and supplements now sell it for healthy aging. In people, the story is smaller and more mixed: no trial has tested whether it helps anyone live longer, the gut and liver convert nearly all of it as it is absorbed ¹, and the human trials that exist are small, short and often contradict each other.

What is resveratrol?

Resveratrol is a plant compound, and the form studied in trials is trans-resveratrol. For the basics, what it is and what it does in your body has its own page, and this guide covers the evidence, aging, menopause, blood sugar, exercise, how much studies use, when and how to take it, forms, side effects and interactions.

It also behaves as a phytoestrogen, a plant compound that can act on the body's estrogen receptors ¹². That is one reason trials have focused on postmenopausal women, and one reason people with hormone-sensitive conditions should ask before taking it.

Why so little reaches your blood

In a study using labeled resveratrol, at least 70% of a 25 mg oral dose was absorbed, yet only trace amounts of unchanged resveratrol (under 5 ng/mL) showed up in the blood. The gut and liver rapidly attach sulfate and glucuronic acid groups to it, and those converted forms are what circulates ¹. At much larger amounts of 0.5 to 5 g a day, the converted forms in blood exceeded unchanged resveratrol by up to 20-fold ². This matters because most of the exciting lab results used unchanged resveratrol at concentrations a capsule does not deliver. Whether the converted forms do anything useful is still being worked out.

What resveratrol is good for: the evidence, graded

Strong means several good randomized trials or a meta-analysis (a study that pools many trials) agree. Moderate means several randomized trials, mostly positive but small or short. Limited means few or small trials, or mixed results. Early means lab, animal or one pilot study only. Not supported means good trials found no benefit. Our guide to how supplements are judged explains why a change in a lab marker is weaker evidence than a change in how people feel or fare.

Does resveratrol slow aging?

No one has shown that in people. The idea came from lab work suggesting resveratrol activates sirtuins, proteins tied to the cell's response to calorie restriction, and from animal lifespan studies. In people, the closest test is observational: the InCHIANTI study measured resveratrol by-products in the urine of 783 adults aged 65 and over in two Tuscan villages and followed them for 9 years. Deaths ran at 34.4%, 31.6%, 33.5% and 37.4% from the lowest to the highest quarter of resveratrol, with no meaningful trend ⁴.

Resveratrol levels achieved with a Western diet did not have a substantial influence on health status and mortality risk of the population in this study.Semba and colleagues, InCHIANTI study, JAMA Internal Medicine, 2014 ⁴

Diet supplies far less than a capsule, so this does not rule out an effect from supplements. It does mean the red-wine-and-longevity story has no support from the people who drink the most red wine. A trial in healthy, non-obese postmenopausal women also found that 12 weeks of 75 mg a day did not switch on the sirtuin pathway in muscle or fat at all ⁶. If longevity is the goal, our guide to nicotinamide riboside covers the other half of the sirtuin pitch, with the same honest gaps.

Resveratrol benefits for women after menopause

The most consistent human data come from the RESHAW trial (Resveratrol for Healthy Aging in Women), which gave 125 postmenopausal women aged 45 to 85 either 75 mg of trans-resveratrol twice a day or a placebo for 12 months, then switched them for another 12 months.

Bone

After 12 months on resveratrol compared with placebo, bone density rose by 0.016 g/cm2 in the lumbar spine and 0.005 g/cm2 at the femoral neck (top of the thigh bone), and CTX, a blood marker of bone breakdown, fell 7.24% ¹². A 2025 pooled analysis of 10 trials in postmenopausal women also found lower CTX, but no change in the bone-building markers ALP and osteocalcin ¹¹. These are small changes from essentially one trial. Osteoporosis is diagnosed with a bone density scan and treated by a clinician, and resveratrol is not a replacement for that care. Our guide to bone markers explains what CTX measures.

Pain, mood and thinking

In the same trial, resveratrol reduced overall pain scores, eased the physical symptoms of menopause a little and improved general well-being ¹⁰, and overall cognitive performance scored better on resveratrol, an effect the authors described as a 33% improvement but which was small in statistical terms (Cohen's d of 0.17) ⁹. When the 2025 meta-analysis pooled every trial, the pain benefit held, but there was no significant effect on cognition, mood, menopausal symptoms, sleep, blood pressure, or blood sugar and cholesterol ¹¹. That makes pain Limited and thinking Limited at best.

Blood sugar and metabolism

A meta-analysis of 9 randomized trials with 283 people with type 2 diabetes found resveratrol lowered fasting glucose by 0.29 mmol/L (about 5 mg/dL), lowered fasting insulin and the HOMA-IR insulin-resistance score, and lowered blood pressure, while HbA1c and cholesterol barely changed. Trials using 100 mg a day or more showed a larger glucose effect ⁵. These were small trials of people already on diabetes care. Resveratrol is not a treatment for diabetes, which is diagnosed and treated by a clinician, and it is never a swap for a prescribed medicine.

In people without diabetes the results split. Eleven obese men who took 150 mg a day for 30 days had lower blood pressure, glucose, liver fat and ALT (a liver enzyme) than on placebo ⁷. But 12 weeks of 75 mg a day in non-obese women with normal blood sugar changed nothing: not insulin sensitivity, body composition, lipids nor inflammation ⁶. If you want to see where your own numbers sit, the HOMA-IR calculator and our blood sugar guide are a better starting point than any supplement; prediabetes is a diagnosis to work through with a clinician.

Can resveratrol interfere with exercise?

It might. In a 2013 trial, 27 inactive men around 65 years old did 8 weeks of high-intensity training while taking either 250 mg of trans-resveratrol a day or placebo. The placebo group's maximal oxygen uptake (a measure of aerobic fitness) improved 45% more than the resveratrol group's, only the placebo group saw blood pressure fall, and resveratrol cancelled training's improvements in LDL cholesterol, the cholesterol ratio and triglycerides ³. That 250 mg is the same amount of trans-resveratrol as one LifeFrom capsule. One small trial does not settle it, but anyone training for fitness has a reason to think twice. The VO2 max calculator estimates the fitness measure the trial tracked.

How much resveratrol do studies use?

These are the amounts trials used, as research history rather than a dose for you. There is no Recommended Dietary Allowance for resveratrol and no official upper limit.

Harm tracked dose: 2.5 and 5 g a day caused mild to moderate stomach and bowel symptoms in healthy volunteers ², and 5 g a day of a micronized drug form caused serious adverse events, mainly kidney failure, in people with multiple myeloma ¹⁴. One LifeFrom capsule holds 250 mg of trans-resveratrol, more than the 150 mg a day used in the bone trial and the same as the exercise trial, and far below the amounts tied to harm.

When and how to take resveratrol

How long does resveratrol take to work? It will not feel like anything. Trials that found a change ran from 30 days for metabolic markers ⁷ to 12 months for bone density ¹². What is the half-life of resveratrol? Only trace amounts of unchanged resveratrol reach the blood, while its converted forms had a combined half-life of about 9 hours in one study ¹, so it does not build up much from day to day.

Forms of resveratrol

Resveratrol side effects

At the amounts in most supplements, trials have reported few problems. In the 29-day study of 40 healthy volunteers, resveratrol was described as safe, but 2.5 and 5 g a day caused mild to moderate gastrointestinal symptoms ². In the PAD trial, diarrhea was reported by 54.6% of people taking NR plus 125 mg of resveratrol, against 39.3% on NR alone and 27.6% on placebo ¹⁵.

Who should avoid resveratrol or ask first

• Pregnancy and breastfeeding: we found no trials of resveratrol supplements in pregnant or breastfeeding women, so safety is unknown. Ask your obstetric clinician first.
• Children: trials enrolled adults, and the label says to keep it out of reach of children.
• Blood thinners or a bleeding disorder: in rats, resveratrol raised warfarin levels and INR ¹³, and in people it slowed CYP2C9, an enzyme that clears warfarin ⁸. Ask first, and tell your care team before surgery.
• Kidney disease or multiple myeloma: the 5 g myeloma trial was stopped after kidney failure ¹⁴. That was 20 times a 250 mg capsule, but it is a reason to ask your specialist first.
• Hormone-sensitive conditions, including breast, uterine or ovarian cancer and endometriosis: resveratrol can act as a phytoestrogen ¹², so ask your oncologist or gynecologist first.
• Cancer treatment: ask your oncology team before adding any supplement.
• Liver disease: ask the clinician who manages it, since high doses change liver enzyme activity ⁸.

Resveratrol interactions

The best human data come from a 2010 study in 42 healthy volunteers who took 1 g a day for 4 weeks. Resveratrol inhibited three enzymes in the CYP450 family (the liver's main drug-clearing system), CYP3A4, CYP2D6 and CYP2C9, and sped up a fourth, CYP1A2. The authors warned this 'could potentially lead to increased adverse drug reactions or altered drug efficacy' ⁸. Nobody has tested whether 250 mg does the same.

Supplements to pair or keep apart

Blood tests worth knowing about

No routine blood test measures resveratrol. The markers below are the ones trials saw move, or the safety checks that matter if you also take certain medicines. Ask your clinician whether any of them are worth checking for you.

Our guides to clotting tests and kidney function explain INR and eGFR, and the eGFR calculator turns a creatinine result into a kidney filtration estimate. A result outside the range on any of these is a conversation for your clinician, not a reason to start or stop a supplement on your own.

Resveratrol in the LifeFrom pouch

One capsule's 250 mg of trans-resveratrol is higher than the 150 mg a day used in the 12-month bone trial and matches the 250 mg that blunted training gains in older men. Everything in a pouch is taken at once, so the Microbiome pack puts resveratrol together with berberine and turmeric, and the Antioxidants pack puts it with alpha lipoic acid: anyone on diabetes medicines or a blood thinner should have a pharmacist look at the whole pack, not resveratrol alone. You can see the shop and its packs.

This guide is general education, not medical advice. Supplements are not FDA-approved for safety or effectiveness, and resveratrol's long-term effects at supplement amounts are not well studied. The clinician who knows your history and your medicines is the right person to decide whether resveratrol fits; see our medical disclaimer.

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