Research review
Does resveratrol help with obesity? What the research does and doesn't show
Meta-analyses of resveratrol and weight disagree, and the individual trials mostly found no change; here is each review and trial, with its dose.
The evidence does not support resveratrol as a way to lose weight. Meta-analyses disagree: one found about half a kilogram lower weight across 28 trials, another found no effect on weight or BMI across 19. The individual trials, at doses from 75 mg to 1,000 mg a day, mostly found no change in weight or body composition.
What the evidence doesn't support
It does not support resveratrol, at any dose or time of day, as a treatment for obesity or a way to lose a meaningful amount of weight. It does not support a dose for weight: two meta-analyses found opposite things about whether doses below or above 500 mg a day worked better. It does not support combining it with another supplement, because we found no randomized trial of resveratrol together with berberine, or against it, for weight. And it does not support before-and-after stories, reviews or photos as evidence, which are not controlled. This is a research review, not advice, and resveratrol is not a treatment for obesity. For the wider evidence, see resveratrol benefits: what the research does and doesn't show.
What the trials found
We searched PubMed on 2 October 2026 for resveratrol with obesity, weight and body-composition terms and read every abstract below. For scale, a 0.5 kg difference is about 1.1 lb, the size of the average effect in the most positive review. Certainty is for the question "did resveratrol change weight or body size in this group".
| Study | Population | Dose and form | Duration | Result | Certainty |
|---|---|---|---|---|---|
| Reviews that disagree | |||||
| PMID 30515938 (2019) | 28 trials in adults | Varied; weight fell in the subgroup under 500 mg a day | Weight fell in trials of 3 months or longer | Weight -0.51 kg, BMI -0.17, waist -0.79 cm; no change in fat mass | Low |
| PMID 30421960 (2020) | 36 trials in adults | Varied | Varied | Small decreases in weight, BMI, fat mass and waist, with large differences between trials; weight fell in obese groups but not in other groups | Low: high heterogeneity |
| PMID 33487308 (2021) | 19 studies in adults | Varied | Varied | No effect on weight or BMI, a small effect on waist; only 3 of 19 showed any positive effect; the authors conclude no anti-obesity effect | Low |
| PMID 27379440 (2016) | 9 trials, 208 overweight and obese adults | 75 to 3,000 mg a day | 14 to 90 days | 7 of 9 found no change in BMI or weight; the authors found the evidence insufficient to recommend it | Low: small, short |
| PMID 38374352 (2024) | 19 meta-analyses of 81 trials, 4,088 people | Varied; weight fell at 500 mg a day or more | Weight fell in trials of 12 weeks or longer | Lower BMI and waist; no significant change in body weight overall | Low to moderate; overlaps the others |
| PMID 40842160 (2025) | 11 trials, 614 adults with type 2 diabetes | Varied | Varied | Weight -0.44 kg, waist -0.80 cm; no effect on hip circumference or waist-to-hip ratio | Low |
| PMID 41987155 (2026) | Umbrella review of 45 meta-analyses | Varied | Varied | Waist circumference -0.80 cm was one of only four high-certainty findings; weight itself was not among them | High for waist; dose and form not broken down |
| Individual trials in people with extra weight | |||||
| PMID 22055504 (2011) | 11 healthy obese men | 150 mg a day | 30 days | Lower sleeping and resting metabolic rate and changes in several metabolic markers; a small crossover study | Low |
| PMID 23193181 (2013) | 24 obese men | "High dose" (mg not in the abstract) | 4 weeks | No difference in energy expenditure, fat content or blood pressure | Low |
| PMID 28182820 (2017) | 74 men with metabolic syndrome | 150 mg or 1,000 mg a day | 16 weeks | No effect on body composition or liver fat; 1,000 mg raised total and LDL cholesterol | Moderate for a null result |
| PMID 32492138 (2020) | 41 overweight men and women aged 40-70 | 150 mg a day | 6 months | No difference in body composition or energy metabolism | Moderate for a null result |
| PMID 24899709 (2014) | 46 healthy overweight adults aged 50-75 | 200 mg a day | 26 weeks | Lower body fat, with changes in a memory score and blood sugar markers | Low |
| Absorption and timing | |||||
| PMID 15333514 (2004) | 6 healthy volunteers | 25 mg, single dose | One dose | At least 70% absorbed; trace unchanged resveratrol in blood; half-life of the compound plus metabolites 9.2 hours | Small but clear |
| PMID 19000554 (2008) | 24 healthy adults | 400 mg trans-resveratrol, single dose, with a high-fat meal or fasted | One dose, two periods | Food delayed the peak (2.0 versus 0.5 hours) but the total absorbed did not change in a relevant way | Moderate for blood levels; no weight outcome |
Resveratrol and weight loss: where the evidence is, and isn't
The evidence is that, if there is an effect on weight, it is small: around half a kilogram on average in the reviews that found one, with 0.8 cm off the waist. It is not that resveratrol helps people lose a lot of weight. Reviews pool different doses and trials of different lengths, and the two that split by dose disagree about which end works. The honest reading is that nobody knows the dose, or the people, it might help.
Questions people ask
Does resveratrol help you lose weight, or will it help weight loss?
Not in a way the research can confirm. Reviews found anything from no effect to about 0.5 kg lower weight on average, and the individual trials above mostly found no change. Even the most positive numbers are small.
What dose of resveratrol is used for weight loss?
No dose has been shown to work. The trials used 75 to 3,000 mg a day; one meta-analysis found weight lower in trials using under 500 mg a day, another in trials using 500 mg a day or more, and the highest stated dose in an individual trial (1,000 mg for 16 weeks) raised LDL cholesterol rather than changing body composition (PMID 30515938, PMID 38374352, PMID 28182820). We therefore give no dose. See resveratrol dosage for what trials used.
What is the best time to take resveratrol for weight loss?
No trial compared times of day for any outcome. What exists is a blood-level study: a high-fat meal delayed the peak of a 400 mg dose from 0.5 to 2 hours without changing the total absorbed. That says nothing about weight. See best time to take resveratrol.
Does resveratrol work with or better than berberine for weight loss?
We found no randomized trial of resveratrol together with berberine, or against it, for weight. Each ingredient needs its own evidence at its own dose, so any claim that the pair is better is untested.
Is one brand or form of resveratrol better for weight loss?
No trial compared brands or forms for weight, so no product can be named. Reviews and before-and-after photos online are not controlled evidence.
When to talk to a doctor
Resveratrol is a dietary supplement, not a treatment for obesity, diabetes or any other condition. If you want to change your weight, or have diabetes, fatty liver or high cholesterol, talk to your doctor first, and do not stop or change prescribed treatment because of anything on this page. Medicine interactions are covered at resveratrol and medications.
Sources
- Resveratrol supplementation significantly influences obesity measures: a systematic review and dose-response meta-analysis of randomized controlled trials Across 28 trials, resveratrol was associated with about 0.5 kg lower body weight and 0.8 cm smaller waist, with no change in fat mass.
- The effects of resveratrol intake on weight loss: a systematic review and meta-analysis of randomized controlled trials Across 36 trials, resveratrol was associated with small decreases in weight, BMI and waist, and with large differences between trials.
- What is the effect of resveratrol on obesity? A systematic review and meta-analysis A review of 19 studies found no overall effect on weight or BMI, a small effect on waist, and concluded no anti-obesity effect.
- The Effects of Resveratrol Supplementation in Overweight and Obese Humans: A Systematic Review of Randomized Trials A review of 9 small trials (208 people, 75-3,000 mg a day) found weight did not change in most and called the evidence insufficient.
- Effects of resveratrol on the anthropometric indices and inflammatory markers: an umbrella meta-analysis An umbrella analysis of 81 trials found lower BMI and waist but no overall change in body weight; weight fell in 12-week-plus trials and at 500 mg a day or more.
- A Systematic Review and Meta-Analysis of Randomized Controlled Trials on the Impact of Resveratrol Supplementation on Anthropometric Indices in Patients With Type 2 Diabetes In 11 trials of adults with type 2 diabetes, resveratrol was associated with about 0.4 kg lower weight and 0.8 cm smaller waist.
- Effects of resveratrol supplementation on multiple health outcomes: an umbrella review of systematic reviews and meta-analyses of randomized controlled trials A 2026 review of 45 meta-analyses found high-certainty effects for only four outcomes, three of them in specific groups (overweight adults, people with type 2 diabetes).
- Calorie restriction-like effects of 30 days of resveratrol supplementation on energy metabolism and metabolic profile in obese humans In 11 obese men, 150 mg a day for 30 days was followed by changes in several metabolic markers; it was a small crossover study.
- High-dose resveratrol supplementation in obese men: an investigator-initiated, randomized, placebo-controlled clinical trial of substrate metabolism, insulin sensitivity, and body composition In 24 obese men, a high dose of resveratrol for 4 weeks changed none of the measured outcomes versus placebo.
- No Beneficial Effects of Resveratrol on the Metabolic Syndrome: A Randomized Placebo-Controlled Clinical Trial In 66 men with metabolic syndrome, 150 mg or 1,000 mg a day for 16 weeks did not improve body composition or other measures, and 1,000 mg raised LDL cholesterol.
- No effect of resveratrol supplementation after 6 months on insulin sensitivity in overweight adults: a randomized trial In 41 overweight adults, 150 mg a day for 6 months did not change insulin sensitivity or body composition; HbA1c was slightly lower.
- Effects of resveratrol on memory performance, hippocampal functional connectivity, and glucose metabolism in healthy older adults In 46 overweight adults aged 50 to 75, 200 mg a day for 26 weeks was followed by a modest gain on one word-memory score versus placebo.
- High absorption but very low bioavailability of oral resveratrol in humans Most of a 25 mg dose was absorbed, but almost none stayed in the blood as plain resveratrol; it was converted to other compounds.
- Effect of food on the pharmacokinetic profile of trans-resveratrol In 24 healthy adults, a high-fat meal delayed the peak of a 400 mg dose of resveratrol but did not change the total absorbed.
*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.