Quick summary

Resveratrol (trans-resveratrol) is a polyphenolic antioxidant compound studied for its potential to support antioxidant defenses and reduce markers of oxidative stress and inflammation. Human clinical evidence is still emerging and inconclusive, with limited evidence for specific health benefits.

What is it?

Resveratrol is a natural polyphenol antioxidant compound found in certain plants such as grapes, berries, and peanuts. It is commonly taken as a dietary supplement purported for antioxidant and anti-inflammatory properties.

How it may work in the body

Resveratrol is proposed to act as an antioxidant and modulate cellular redox status and inflammation pathways. However, human evidence on its mechanisms remains limited and mostly based on theoretical and preclinical models.

  • Antioxidant activity through scavenging free radicals
  • Modulation of redox signaling pathways
  • Anti-inflammatory effects via inhibition of certain inflammatory mediators

Limitations: Most evidence of mechanisms is derived from in vitro and animal studies. Human mechanistic studies remain limited and inconsistent, making it difficult to confirm these effects clinically.

Common supplement forms

  • Capsules
  • Tablets
  • Powder

Typical dosage and how it is used

There is no officially established recommended daily intake for resveratrol. Clinical studies have used a wide range of dosages, but standardized safe and effective dosage recommendations are not available due to limited clinical evidence.

No official recommended daily intake or dietary allowance currently exists for resveratrol.

Because dosage for safety and efficacy has not been standardized, people choosing to use resveratrol supplements should do so with caution and ideally under medical guidance.

Natural sources

  • Grapes and grape skins
  • Berries
  • Peanuts

Absorption and bioavailability

Resveratrol has limited bioavailability in humans due to rapid metabolism and elimination, which may reduce its effectiveness in the body.

Different supplement forms may vary in bioavailability but no clear consensus exists on superiority of one form over others.

Potential benefits: what does the evidence say?

Antioxidant support and reduction of oxidative stress

Preliminary human studies have examined effects on antioxidant defenses and oxidative stress biomarkers, with mixed and inconclusive results.

Evidence level: Limited

Limitations: Evidence is limited by small, heterogeneous clinical trials and variability in dosages and formulations.

Anti-inflammatory effects

Some clinical research suggests possible anti-inflammatory effects, but human studies are few and show inconsistent results.

Evidence level: Limited

Limitations: Insufficient large, well-controlled human studies to establish clear effects.

Side effects and safety

  • No common side effects have been consistently reported in clinical studies.
  • No well-defined contraindications have been established.
  • High doses have not been extensively studied for safety; possible risks of high intake remain unclear.
  • Safety in pregnancy and breastfeeding is not well established due to lack of evidence.

Supplement quality and purity can vary widely since resveratrol products are not standardized or regulated with set quality criteria. This variability can affect safety and efficacy.

Drug and supplement interactions

Currently, there is insufficient evidence to characterize specific drug or supplement interactions with resveratrol. Caution is advised when combining with other medications or supplements, particularly those affecting blood clotting, liver metabolism, or inflammatory pathways. Consulting a healthcare professional is recommended.

Who should be careful?

People who are pregnant, breastfeeding, have medical conditions, or who use prescription medications should consult a healthcare professional before using resveratrol supplements. Those planning surgery or with bleeding disorders should also seek medical advice due to limited safety data.

Pregnancy, breastfeeding and special populations

The safety of resveratrol supplementation during pregnancy and breastfeeding is not well established because of a lack of rigorous studies. Use in these populations should be approached cautiously and only under medical supervision.

Quality, standardization and what to look for

Resveratrol supplements are not standardized or regulated with uniform quality criteria. Consumers should consider the following when selecting a product:

  • Choose supplements from reputable manufacturers with third-party testing or certificates of analysis.
  • Look for clear labeling of trans-resveratrol content and purity.
  • Be cautious of products that make strong health claims unsupported by evidence.
  • Verify that the product does not contain contaminants or adulterants.

Frequently asked questions

  • Does resveratrol prevent diseases?
    There is no strong clinical evidence that resveratrol prevents or cures any disease. Research is ongoing, and current findings are inconclusive.
  • Can I get enough resveratrol from diet alone?
    Resveratrol is present in foods like grapes and peanuts but in relatively small amounts. Dietary intake usually results in much lower levels than those used in some supplement studies.
  • Are all resveratrol supplements the same?
    No. Different supplement forms may have variable bioavailability and quality. Look for standardized products from trustworthy brands.
  • Is it safe to take resveratrol supplements long term?
    Long-term safety has not been well studied. It is advisable to consult a healthcare professional before prolonged use.
  • Are there any official health claims for resveratrol?
    According to current evidence, there are no EU-authorized health claims for resveratrol supplements.

Evidence limitations

  • Human clinical evidence is limited, inconsistent, and lacks large well-designed trials.
  • No official recommended intake has been established.
  • Mechanistic evidence is mainly from preclinical studies and may not translate to humans.

References

Last reviewed

June 2024

Disclaimer: This page provides information based on current scientific evidence and is for educational purposes only. It does not constitute medical advice. Always consult a healthcare professional before starting any new supplement, especially if you are pregnant, breastfeeding, have a medical condition, or take medications.