Supplement

Resveratrol

Q: Does resveratrol really work?

For the advertised longevity effects, there is no evidence in humans. A placebo-controlled study missed its primary endpoint, metabolic function, a cohort over nine years found no association with mortality, and an umbrella review of ten meta-analyses concluded that resveratrol is not a useful agent.

Q: Can resveratrol harm training?

In a randomized study with 27 older, inactive men, the increase in maximal oxygen uptake was 45 percent greater under placebo than under resveratrol. Blood pressure fell only under placebo, and the positive training effects on blood lipids were cancelled out under resveratrol.

Q: Does resveratrol really activate sirtuins?

In cell experiments, yes; in humans, this has not been reproduced. In both randomized studies reviewed, SIRT1 remained unchanged, as did other signaling pathways such as AMPK and PPARGC1A. Central papers on the sirtuin hypothesis have also been questioned repeatedly, and the bioavailability of the substance is low. The advertised mechanism thus lacks confirmation in humans.

Q: Does resveratrol help with blood sugar?

No, at least not demonstrably. An umbrella review of ten meta-analyses on type 2 diabetes found no significant effects on fasting glucose, HbA1c, insulin or HOMA-IR. Only a single analysis found a significant reduction in LDL cholesterol. A placebo-controlled study also found no improvement in insulin sensitivity in liver, muscle or adipose tissue.

Q: Is red wine enough for the resveratrol effect?

The question can be turned around: in a cohort of 783 people aged 65 and over, intake was measured via resveratrol metabolites in urine, that is, at amounts typical of the diet. Over nine years, there was no association with mortality, inflammation markers, cardiovascular disease or cancer. This cohort says nothing, however, about high-dose supplements.

Q: What side effects does resveratrol have?

Systematic data on harms are not available in the evidence reviewed. It is documented that training effects were reduced in older men. Further caveats are caution with blood thinners and an estrogenic effect that should be taken into account in hormone-sensitive conditions. This page gives no usage recommendation.

Antioxidant · Trans-Resveratrol

Resveratrol is a polyphenol from grapes that activates sirtuins in cell experiments. Robust evidence of efficacy in humans is lacking; in combination with exercise, it cancelled out the training effect in a randomized study.

What resveratrol is

Resveratrol occurs in very small amounts in red wine, grapes and berries; as a food supplement, trans-resveratrol is usually sold. The sales pitch rests on the activation of SIRT1, an enzyme from the sirtuin family, to which a role in aging processes is attributed.

The transfer of these cell experiments to humans is disputed, central sirtuin papers have been questioned repeatedly, and bioavailability is low. Twenty years of headlines stand against a very thin body of human data.

What has been tested in humans

Mainly metabolic markers, vascular markers and, in one cohort, all-cause mortality were tested. The most striking finding, however, comes from a training study in which resveratrol was not without effect, but reduced the effect of training.

What is rated here is the state of knowledge. A low evidence score means that little has been robustly studied, and not that a benefit simply has not yet been found.

What is well supported

The postulated mechanism is clearly described in cell experiments – and therefore testable. Resveratrol activates sirtuins there. Because the chain of action is named explicitly, with SIRT1, AMPK, NAMPT and PPARGC1A, exactly these target parameters could be measured in humans; both randomized studies did so. The hypothesis is thus cleanly formulated, which is not a given in this field.
The safety picture is unremarkable across several studies. Tested were 75 mg per day over twelve weeks and 250 mg per day over eight weeks, each double-blind and placebo-controlled, plus a cohort of 783 people aged 65 and over followed for nine years with objective exposure measurement in 24-hour urine. The evidence reviewed reports no adverse effects from any of these studies. The only documented signal concerns the combination with exercise and is described in the Safety section.

What the studies show

The strongest finding: training effect cancelled out

Gliemann 2013 gave 27 healthy, inactive men around 65 years of age 250 mg of trans-resveratrol or placebo for eight weeks, in each case in addition to high-intensity training. The increase in VO2max was 45 % greater under placebo than under resveratrol (p<0.05). Blood pressure fell only under placebo (−4.8 mmHg). The positive training effects on LDL, the ratio of total cholesterol to HDL, and triglycerides were cancelled out under resveratrol. SIRT1 remained unchanged.

A cohort without any association

Semba 2014 followed 783 people aged 65 and over in the InCHIANTI cohort for nine years; resveratrol metabolites were measured in 24-hour urine. 268 people died. For the primary endpoint, all-cause mortality, there was no association: the proportion who died in the four groups was 34.4, 31.6, 33.5 and 37.4 % (p=0.67). There was also no association with inflammation markers, cardiovascular disease or cancer.

Metabolism: primary endpoint missed

Yoshino 2012 tested 75 mg per day over twelve weeks, double-blind and placebo-controlled, in non-obese postmenopausal women with normal glucose tolerance. The primary endpoint, metabolic function, was missed. Body composition, resting energy expenditure, blood lipids and inflammation markers did not change, and neither did insulin sensitivity in liver, muscle and adipose tissue.

Umbrella review: not a useful agent

Ghalichi 2026 summarized ten meta-analyses on type 2 diabetes. There were no significant effects on fasting glucose, HbA1c, insulin, HOMA-IR, LDL-C, HDL-C, triglycerides or total cholesterol; only a single analysis found a significant reduction in LDL-C. The paper's conclusion is that resveratrol is not a useful agent.

What the human studies do not show

The longevity benefit. In the only cohort reviewed with measurement of intake, there was no association with all-cause mortality over nine years. Intervention studies with lifespan endpoints do not exist.
Sirtuin activation in humans. In both randomized studies, the associated signaling pathways remained unchanged, including SIRT1, AMPK and PPARGC1A. The advertised mechanism has therefore not been reproduced in humans.
The benefit for blood sugar and blood lipids. An umbrella review of ten meta-analyses found no consistent effect in type 2 diabetes on any of the usual metabolic parameters.
The advertised synergy with NMN or NR. The evidence reviewed contains no study that has examined a combined effect.

Status, approval and legal

Resveratrol is sold as a food supplement, not as a medicinal product; an official benefit assessment is not found in the evidence reviewed. The usual situation for food supplements therefore applies: proof of efficacy is not required for sale, and the available human studies do not provide it either.

Safety

The documented safety signal concerns the combination with exercise: in older, previously inactive men, the positive training effects on VO2max, blood pressure and blood lipids were reduced or cancelled out under resveratrol. This does not show general harm, but it does show that the substance is not without effect.

Further caveats mentioned are caution with blood thinners and an estrogenic effect that should be taken into account in hormone-sensitive conditions.

BK-Score Long used, barely studied

Human evidence		2
Mechanism		5
Safety data		7
Hype gap		1
Track record of use		7

The cautionary tale of the longevity scene: twenty years of headlines, a billion-scale deal – and to this day no robust evidence of efficacy in humans, plus doubts about central sirtuin papers. Low bioavailability. The largest hype gap in the entire database.

The score rates the state of knowledge, not the substance. “Safety data 9” means well studied – not harmless. “Track record of use 9” means used long and widely – that is not proof of efficacy.
Subjective assessment by Biohacking Kompakt based on published scoring rules – not a scientific rating and not a medical recommendation. Rules and all ratings (German)

Frequently asked questions about resveratrol

Does resveratrol really work?