Most human clinical trials use resveratrol doses between 150 and 500 mg per day, and a typical over-the-counter recommendation is 500 mg twice daily. But the right amount for you depends on what you’re hoping to achieve, since studies on heart health, blood sugar, and general wellness have tested very different ranges.
Doses Used in Clinical Trials
Human studies have tested resveratrol at doses ranging from as low as 8 mg per day up to 5,000 mg (5 grams) per day. That’s a massive spread, which is part of why pinning down a single “right” dose is tricky. The most commonly studied range for general health benefits falls between 150 and 1,000 mg daily.
For cardiovascular goals like blood pressure and arterial stiffness, trials have used doses of 75 mg, 100 mg, 150 mg, 250 mg, 300 mg, and 500 mg daily, with study durations lasting anywhere from 30 days to several months. Meta-analyses looking across multiple studies suggest that the blood pressure benefits kick in at around 150 to 300 mg per day, with a dose-dependent effect: higher doses tend to produce larger reductions in systolic blood pressure.
For blood sugar management, a systematic review of trials in people with type 2 diabetes found that doses of 100 mg per day or higher significantly reduced fasting blood sugar levels, while doses below 100 mg had no meaningful effect. The studies that showed the clearest metabolic improvements used doses between 150 mg and 1,000 mg daily for at least four weeks.
Why Age May Influence Your Dose
Your age appears to affect how well resveratrol works, and at what dose. A combined analysis of clinical data found that people between 45 and 59 years old saw significant improvements in blood sugar, insulin levels, and a key marker of long-term blood sugar control. People 60 and older also showed meaningful improvements in insulin sensitivity and insulin resistance.
The effect was most noticeable at doses between 500 and 1,000 mg in the 45-to-59 age group. This likely reflects the fact that inflammation and oxidative stress increase significantly after the fifth decade of life, giving resveratrol more room to make a measurable difference. Younger, healthier adults may not see the same magnitude of benefit at any dose, simply because their baseline markers are already in a healthy range.
Trans-Resveratrol Is the Form That Matters
Resveratrol comes in two chemical forms: trans and cis. Trans-resveratrol is considered the bioactive form, and it’s the one used in virtually all clinical research. When you’re reading supplement labels, look for “trans-resveratrol” specifically.
The reason the form matters comes down to what happens in your gut. Trans-resveratrol passes through intestinal cells largely intact, while the cis form gets broken down up to 90 times faster through a metabolic process called glucuronidation. In practical terms, cis-resveratrol is mostly destroyed before your body can use it. Even trans-resveratrol has relatively low bioavailability overall, which is one reason supplement doses are measured in hundreds of milligrams rather than micrograms.
Once or Twice a Day
Resveratrol clears your system quickly. After a single dose, it has a half-life of just 1 to 3 hours, meaning half of it is gone from your bloodstream within that window. With repeated daily dosing, the half-life extends slightly to 2 to 5 hours, but it’s still short-lived compared to many supplements.
This is why many supplement manufacturers recommend splitting your daily dose into two servings, typically morning and evening. If you’re taking 500 mg per day, for example, two 250 mg doses spaced 8 to 12 hours apart will maintain more consistent levels than a single dose. Taking resveratrol with food, particularly food containing some fat, may also help with absorption.
You Can’t Get Therapeutic Doses From Wine
Red wine is often cited as a natural source of resveratrol, but the math doesn’t come close to working out. The average red wine contains roughly 1.9 mg of trans-resveratrol per liter. A standard glass of wine (about 150 ml) delivers approximately 0.3 mg. To match even a modest 150 mg supplement dose, you’d need to drink around 500 glasses. The health risks of that much alcohol would obviously overwhelm any possible benefit from resveratrol. If you’re interested in therapeutic doses, supplements are the only realistic option.
Side Effects and Upper Limits
At doses commonly used in clinical trials (up to about 1,000 mg per day), resveratrol is generally well tolerated. Problems start emerging at higher doses. Taking 2,000 to 5,000 mg per day has been linked to digestive issues including diarrhea, nausea, and abdominal discomfort. In one clinical trial that used 5,000 mg daily, patients experienced nausea, diarrhea, fatigue, and signs of kidney stress.
There’s no officially established tolerable upper intake level for resveratrol, but the pattern across studies is clear: staying at or below 1,000 mg per day avoids the gastrointestinal side effects that become common at higher doses. Most people using resveratrol for general wellness or cardiovascular support will fall well within this range at 150 to 500 mg daily.
A Practical Starting Point
Based on the weight of clinical evidence, a reasonable starting dose for most adults is 150 to 500 mg of trans-resveratrol per day, split into two doses. If your primary interest is cardiovascular support, 150 to 300 mg daily aligns with the doses that showed blood pressure benefits in meta-analyses. For metabolic goals like blood sugar management, the evidence favors doses of at least 100 mg daily, with stronger results at 250 to 1,000 mg. Adults over 45 may benefit from the higher end of these ranges, particularly in the 500 to 1,000 mg range, based on age-stratified data showing greater responsiveness in older populations.
Resveratrol can affect how your body processes certain medications, particularly those metabolized by the liver. If you take blood thinners, blood pressure medications, or other prescriptions, checking for interactions before starting supplementation is worth the effort.