Disclaimer: This article is for informational purposes only and does not replace medical advice. Always consult a doctor before starting to use dietary supplements.
What is resveratrol?
Resveratrol is a naturally occurring polyphenol produced by plants as a defence against stress, injury and disease. The compound is found in high concentrations in the skin of red grapes, berries (blueberries, cranberries, raspberries), peanuts and the plant Japanese knotweed – the most common source for supplements. It is above all trans-resveratrol that is the biologically active and stable form.
Resveratrol attracted attention in the 1990s as a possible explanation for the so-called "French paradox" – the fact that the French, despite a high-fat diet, have a relatively low incidence of cardiovascular disease, something that was linked to moderate red wine consumption. Since then the compound has been studied intensively, particularly in cellular ageing research, cardiovascular health and brain function.
With us you will find quality-assured resveratrol supplements in pure trans form.
How does resveratrol work in the body?
Resveratrol affects the body via several interacting mechanisms:
Sirtuins and SIRT1 – ageing-regulating enzymes
The most talked-about mechanism of action is the activation of sirtuins, a family of enzymes that regulate cells' energy metabolism, repair capacity and resistance to age-related stress. Resveratrol primarily activates SIRT1, which in turn starts processes linked to improved mitochondrial function, increased autophagy (cellular clean-up) and more efficient DNA repair. Research from, among others, David Sinclair's laboratory at Harvard shows that SIRT1 activation can mimic the effects of calorie restriction – one of the best-documented ways to extend lifespan in animals.
Powerful antioxidant
Resveratrol neutralizes free radicals and reduces oxidative stress, which protects cells from damage. Brain cells are particularly vulnerable because they consume a lot of oxygen and contain fats that oxidize easily – here resveratrol plays an important protective role.
Anti-inflammatory effect
Resveratrol inhibits pro-inflammatory signalling pathways, particularly NF-κB-activation and COX-2 expression, and reduces inflammatory cytokines such as TNF-α, IL-1β and IL-6. Chronic low-grade inflammation is linked to cardiovascular disease, diabetes, cognitive decline and cancer – which makes resveratrol's anti-inflammatory action broad and clinically interesting.
Resveratrol and the brain: cognitive health
One of the most active research fields concerns resveratrol's effects on brain health and cognitive function.
Protective mechanisms in brain cells
Resveratrol protects nerve cells by:
- Reducing oxidative stress – neutralizes free radicals in brain cells that would otherwise cause cell death and impaired signal transmission.
- Dampening neuroinflammation – blocks NF-κB and p38 MAP kinase, which reduces activation of microglia and astrocytes, the cells that drive chronic brain inflammation.
- Increasing blood flow to the brain – studies show that resveratrol increases cerebral blood perfusion, which gives better oxygen supply and nutrient delivery to brain cells.
- Activating SIRT1 and BDNF – SIRT1 activation is linked to improved cell repair and preserved cognitive function. Animal studies show that resveratrol maintains BDNF levels in the hippocampus, an area crucial for memory and learning.
- Increasing neurogenesis – animal studies show that resveratrol can increase the formation of new nerve cells in the hippocampus by up to 2.4 times.
What does research in humans say?
Human studies show promising but mixed results. A study from 2014 reported improved memory, while a meta-analysis with 225 participants found no clear general improvements. Postmenopausal women appear to benefit the most – probably thanks to resveratrol's weak phytoestrogenic properties. A 14-week study and a follow-up 12-month study showed improved cognitive function in this group.
The most cited study is the RESHAW study, in which 75 mg resveratrol twice daily for 24 months improved cognition by up to 33 % and increased blood flow to the brain. Another study found that 1 000 mg daily improved psychomotor speed in older participants.
Resveratrol and neurodegenerative diseases
Laboratory and animal studies show that resveratrol can reduce the accumulation of amyloid-β (a protein linked to Alzheimer's disease) and dampen neuroinflammation. A multicentre study with 179 patients showed no significant cognitive improvement, but a 40 percent reduction in NSE – a biomarker for neuronal damage – suggests neuroprotective effects.
Resveratrol and longevity: the anti-ageing perspective
Resveratrol is one of the most studied substances in longevity research. Research shows that it can activate the same biological pathways as calorie restriction – without reducing food intake.
David Sinclair and resveratrol
Professor and ageing researcher David Sinclair at Harvard Medical School has popularized resveratrol as a SIRT1 activator. In animal studies, resveratrol has extended the lifespan of organisms such as yeast, worms and mice. Sinclair has stated that resveratrol at the doses that show effects in mice would require "a hundred to a thousand glasses of red wine" – one reason why supplements in the form of trans-resveratrol have become popular.
Resveratrol + NMN: the longevity stack
In the longevity community, resveratrol is often combined with NMN (nicotinamide mononucleotide) – an NAD+ precursor. The mechanism is synergistic: NMN raises levels of NAD+, which is a necessary coenzyme for sirtuins (including SIRT1) to function. Resveratrol activates SIRT1, but without sufficient NAD+ the activation loses its effect. The combination of NMN and resveratrol therefore helps both activate and fuel the SIRT1 system. At Tongkatbutiken you will find NMN supplements to combine with resveratrol.
Cardiovascular health and blood sugar
Resveratrol has been investigated for effects on the cardiovascular system in a large number of studies:
- Blood pressure: A 2015 review showed that daily doses of 150 mg or more significantly lowered systolic blood pressure.
- Cholesterol: Some studies show increased HDL and decreased LDL, but the results are not consistent.
- Platelet inhibition: Resveratrol can inhibit platelet aggregation and reduce the risk of blood clots.
- Insulin sensitivity: Studies indicate that resveratrol may improve insulin sensitivity and contribute to more stable blood sugar.
Natural sources of resveratrol
Resveratrol is found in several common foods, but the levels are low compared with supplement doses:
- Red wine – approx. 200 μg per glass (15 cl); the Pinot Noir grape variety can contain 5–10 mg/kg in the grape skin.
- Blueberries, cranberries and raspberries – resveratrol is concentrated in the skins.
- Dark chocolate and cocoa – contain moderate amounts.
- Peanuts and pistachios – mainly in the skins.
On average we consume around 100–500 μg of resveratrol per day through our diet – dramatically lower than the 100–1 000 mg/day used in clinical research.
Trans-resveratrol vs cis-resveratrol – what is the difference?
Resveratrol occurs in two forms: trans-resveratrol and cis-resveratrol. Trans-resveratrol is the biologically active form – stable and well absorbed by the body. Almost all research showing positive effects has used trans-resveratrol. Cis-resveratrol is biologically inactive and is not converted into the trans form in the body. Always check that it is trans-resveratrol that is stated on the label – many cheap products contain mixed forms with a low proportion of active substance.
Dosage and safety
There is no officially established dose recommendation, but research provides guidance:
- Antioxidant support and general health: 100–500 mg/day.
- Cardiovascular health: 150–1 000 mg/day in studies.
- Cognition (older adults and postmenopausal women): 75–150 mg per dose, 2 times daily.
- Longevity protocol (Sinclair): 500–1 000 mg/day.
Doses up to approx. 1 g/day are generally well tolerated. At doses above 2.5–3 g/day, the risk of stomach upset increases.
Important to know
- Blood-thinning medication: Resveratrol can affect the blood's ability to clot. Be careful when combining with warfarin, aspirin or clopidogrel. Stop taking the supplement 2 weeks before a planned operation.
- Hormone-sensitive conditions: Resveratrol has weak phytoestrogenic activity. Consult a doctor if you have hormone-sensitive cancers or conditions.
- Quality assurance: Choose products tested for contaminants (emodin, PAH) and without unnecessary additives.
Bioavailability – how to improve your body's absorption
Resveratrol naturally has low bioavailability because the liver breaks it down quickly. There are several ways to improve absorption:
- Piperine (black pepper extract) – can noticeably increase bioavailability.
- Micronized formulations – finely ground powder provides a larger contact surface and better absorption.
- Liposomal forms – encapsulated in fat droplets for protected passage through the gastrointestinal tract.
- Take with a fatty meal – fat aids the absorption of fat-soluble compounds such as resveratrol.
- Split the dose – morning and evening gives more even plasma levels.
Combining resveratrol with other supplements
Resveratrol works synergistically with:
- NMN – complements SIRT1 activation with NAD+ substrate. The most popular longevity combination. See our NMN products.
- Quercetin – another polyphenol with anti-inflammatory properties.
- Pterostilbene – a methylated analogue of resveratrol with higher bioavailability.
- Astaxanthin – a powerful carotenoid antioxidant as a complement for brain health and cell protection.
Supplements vs. natural sources
| Aspect | Natural sources | Supplements (trans-resveratrol) |
|---|---|---|
| Dosage | Low (approx. 200 μg/glass of wine) | High (100–1 000 mg/capsule) |
| Active form | Mixture of trans and cis forms | Pure trans-resveratrol |
| Bioavailability | Combined with other antioxidants | Can be optimized with piperine/liposomal forms |
| Practicality | Requires large amounts of food/drink | Consistent daily dose without calories |
| Research | Limited at natural dose levels | All clinical research based on supplements |
| Safety | Safe in normal portions | Safe up to approx. 1 g/day; stomach upset at high doses |
Conclusion
Resveratrol is one of the most well-studied natural substances, with promising effects on brain health, the cardiovascular system and cellular ageing research. The scientific picture is strongest in animal studies, but human research – particularly regarding cognition in older adults and postmenopausal women – provides interesting findings. Always choose trans-resveratrol in a quality-assured form, start with a low dose and consult a doctor if you take other medication.
Want to combine resveratrol with NMN for a complete longevity protocol? See our resveratrol supplements and NMN products.
FAQ about resveratrol
What is trans-resveratrol and why is it important?
Trans-resveratrol is the biologically active and stable form of resveratrol. Cis-resveratrol is biologically inactive. All clinical research showing positive health effects has used trans-resveratrol. Always check that the product specifically states "trans-resveratrol" on the label.
How do you improve the body's absorption of resveratrol?
Take resveratrol together with a fatty meal and preferably with piperine (black pepper extract), which increases bioavailability. Micronized and liposomal formulations also provide better absorption. Split the dose between morning and evening for more even plasma levels.
Can you combine resveratrol with NMN?
Yes – this is one of the most popular combinations in longevity research. NMN raises the NAD+ levels required for SIRT1 to function, while resveratrol activates SIRT1. They act synergistically and are usually taken together in the morning.
What side effects can resveratrol cause?
Doses up to approx. 1 g/day are generally well tolerated. At doses above 2.5–3 g/day, stomach problems may occur: nausea, diarrhoea, gas and cramps. Start with a low dose and increase gradually. Resveratrol can affect blood clotting – be careful with blood-thinning medication.
Can resveratrol help against Alzheimer's?
Animal and laboratory studies show that resveratrol can reduce amyloid-β aggregation and dampen neuroinflammation linked to Alzheimer's. A multicentre study with 179 patients showed no cognitive improvement but a 40 percent reduction in NSE (a biomarker for neuronal damage). The research is promising but not conclusive.
How much resveratrol should you take per day?
It varies by purpose. For general antioxidant support: 100–500 mg/day. For heart health: 150–1 000 mg/day. For cognition in older adults: 75–150 mg twice daily (the RESHAW study). Longevity protocol: 500–1 000 mg in the morning. Always start with a lower dose.
Is the resveratrol in red wine enough?
No. A glass of red wine contains approx. 200 μg of resveratrol – 500–5 000 times lower than the doses used in research (100–1 000 mg). In addition, red wine contains alcohol, whose negative effects probably outweigh any resveratrol benefits.
