Resveratrol
Resveratrol (trans-3,5,4'-Trihydroxystilbene), Longevity Polyphenol Marketed for T and Fertility
Evidence grade 2 of 5, Thin. Read how the Atlas grades evidence.
The written rationale for this grade is still being prepared.
- FDA
- Not FDA approved; sold as a dietary supplement
Reference only. Not medical advice.
What can go wrong
Well tolerated at common doses; high doses (1 g+) cause GI upset (nausea, diarrhea, cramping). Resveratrol inhibits CYP enzymes and has antiplatelet activity, so it can interact with anticoagulants and various drugs. Its estrogenic activity warrants caution in hormone-sensitive conditions. Long-term safety of high-dose supplementation is not established.
This is something to take to a clinician. The Atlas can tell you what is known about resveratrol in general. It cannot tell you what is happening in your body, and the difference matters most for exactly the symptoms that bring people to this page.
Resveratrol is a stilbene polyphenol from grapes, red wine, and Japanese knotweed, famous as a purported sirtuin (SIRT1) activator and longevity compound. In men's health it is marketed for testosterone, anti-aromatase effects, and fertility. The best-controlled human hormone data, Kjaer et al. (2015), a 4-month RCT of 1,000 mg/day in middle-aged men, found resveratrol lowered circulating androgen precursors but had NO effect on testosterone, DHT, PSA, or prostate volume. Preclinical fertility data are encouraging but human trials are small and multi-ingredient, and oral bioavailability is roughly 1%.
A longevity darling whose one good male-hormone trial showed no testosterone benefit.
What people take it for
These are the reasons people give for taking it. They are not effects it has been shown to have.
How it is supposed to work
Resveratrol activates SIRT1 and AMPK pathways and acts as an antioxidant; in reproductive tissue it is proposed to protect sperm via SIRT1/Nrf2 antioxidant signaling and reduce NF-kB inflammation. It is also a phytoestrogen that can modulate estrogen receptors and inhibit aromatase in vitro, which underlies conflicting 'raises testosterone' and 'estrogenic' marketing claims.
Contradictory claims, poor absorption, no androgen payoff
Resveratrol is marketed simultaneously as anti-estrogenic (aromatase inhibitor) and as a phytoestrogen, which should be a red flag. In the one good controlled trial, it lowered androgen precursors without raising testosterone, essentially the opposite of the T-boosting pitch. Its ~1% oral bioavailability and rapid glucuronidation mean tissue exposure is low, and the 'sirtuin activator' longevity narrative remains scientifically contested after high-profile disputes.
What people get wrong
Often saidResveratrol boosts testosterone
ActuallyThe best controlled trial showed no testosterone change; it lowered androgen precursors and is also phytoestrogenic.
Often saidRed wine gives you a meaningful dose
ActuallyThe resveratrol content of wine is trivial relative to studied doses, and alcohol independently harms testosterone and fertility.
Who profits, and who pushes back
Nobody is named here yet, because we have not done that work on this entry. Read that as unfinished. Somebody almost certainly sells this, and somebody almost certainly disputes it. Assume both until we have checked.
Set against the alternatives
Within the fertility-antioxidant field it is less studied than CoQ10 or carnitine; within the testosterone field its one good trial is negative. Its strongest cultural momentum is longevity, not men's health, where the evidence is weakest.
What we do not know
- Does resveratrol improve any hard fertility outcome, or only surrogate sperm metrics?
- Can bioavailability be raised enough to matter?
- Is the sirtuin/longevity mechanism real in humans?
The market for this
What follows describes how this is bought and sold. It is not a buying guide and it is not an endorsement of any seller.
Most supplemental resveratrol is extracted from Polygonum cuspidatum (Japanese knotweed); trans-resveratrol is the active isomer and product potency/isomer purity vary. Emodin, a knotweed contaminant with laxative and genotoxicity concerns, is a documented purity issue in some extracts.
At a glance
- Hormone RCT
- Kjaer 2015, 1,000 mg/day, 4 months, middle-aged men
- Hormone result
- No change in T, DHT, PSA, or prostate volume
- Oral bioavailability
- ~1% (rapid conjugation)
What this entry does not yet cover
What follows is unfinished work on our side, not a finding about Resveratrol. A short entry is not a safe entry.
- Timeline. We have not built the dated record of research and regulatory events.
- Cost and market. We have not documented what it sells for or who sells it.
- Supply chain. We have not mapped where it is made.
- Who uses it. We have not documented the user groups.
- What could change. No forward-looking summary yet.
- Children and teenagers. We have not checked what is known about younger people.
- Where we land. We have not taken a position on this yet.
Sources
The studies below are named and described, but not linked. You cannot open them from here and check our reading against them, which means this page is our summary of the literature rather than a document you can verify. Weigh it accordingly until the links exist.
The studies that matter
Kjaer et al., The Prostate (RCT, 1,000 mg, 4 mo)2015
Lowered androgen precursors; no effect on testosterone, DHT, PSA, or prostate volume
Resveratrol-multivitamin pilot in idiopathic infertility2020
Reported improved sperm concentration/motility; multi-ingredient, cannot isolate resveratrol
Reviews of resveratrol in male fertility2021
Mechanistically plausible antioxidant effects; clinical evidence limited by small trials and low bioavailability