Resveratrol
Also known as: trans-resveratrol, 3,5,4'-trihydroxystilbene, polyphenolic phytoalexin, RSV
Effective Dosage
500 mg/day (clinical trials for joint health); 75 mg/day (skin health trial)
What the Science Says
Resveratrol is a natural compound found in grapes, red wine, and certain plants. In clinical trials, 500 mg daily for 12–18 weeks reduced knee pain, improved physical function, and lowered inflammation markers (CRP) in older adults with knee osteoarthritis — likely by activating a protein called SIRT1. Separately, a combination of oral (75 mg) and topical resveratrol reduced visible wrinkles in women over 40 after 8 weeks.
What It Doesn't Do
Won't reverse or cure osteoarthritis — it eases symptoms, not the underlying joint damage. No clinical evidence from these studies that it extends human lifespan. Cancer-fighting claims are based on lab and animal studies only — not proven in humans. No evidence it boosts brain health or prevents Alzheimer's in humans from the provided data. Topical use alone showed limited benefits beyond sebum levels.
Evidence-Based Benefits
Resveratrol at 500 mg/day significantly reduced pain, improved WOMAC scores, gait velocity, handgrip strength, and range of motion in knee osteoarthritis patients over 12-18 weeks, with effects potentially mediated by increased plasma SIRT1 and reduced CRP and oxidative stress markers (PMIDs: 41037125, 41679011). Combined oral (75 mg) and topical (1.5% cream) trans-resveratrol reduced wrinkle scores in women over 40 after 8 weeks compared to placebo (PMID: 41488277). Pre-clinical and in vitro data suggest radioprotective effects on endothelial cells and potential chemosensitizing properties, though these lack clinical validation (PMIDs: 41934924, 41895749).
Moderate EvidenceEffective at: 500 mg/day based on clinical trials in knee OA; lower doses used in skin studies (75 mg oral + topical)
Source: auto-research
Absorption & Bioavailability
Poor — resveratrol is rapidly metabolized after oral ingestion. Studies confirm serum levels rise with supplementation, but the compound is quickly converted to conjugates. Topical application may bypass some metabolic issues. Delivery via specialized formulations (e.g., liposomes) is being explored but not yet clinically validated.
Red Flags to Watch For
- Most anti-aging and cancer-prevention claims are based on lab (in vitro) or animal studies, not human trials
- The osteoarthritis trials were retrospectively registered, which is a methodological concern that limits confidence in results
- High doses (500 mg/day) used in trials far exceed amounts found in food or many commercial supplements — check label doses carefully
- Rapid metabolism means standard oral supplements may not reach effective tissue concentrations without specialized delivery systems
- Skin benefits required both oral AND topical use simultaneously — oral-only or topical-only showed limited effects
Products Containing Resveratrol
See how Resveratrol is used in these analyzed products:
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-06