Fisetin supplement beside cell culture equipment

Fisetin and Longevity: What the Research Shows

Fisetin is a plant flavonol that extended lifespan in one mouse study and failed to do so in another. Human evidence is still small and mixed. It is studied as a senolytic, a compound that may help clear senescent (“zombie”) cells, which accumulate with age. This article sets out what was tested, in which animals and people, at which doses, and what that means if you are considering a fisetin supplement.

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TL;DR

  • Fisetin is a flavonol found in strawberries, apples, grapes, onions and cucumbers. It is researched for antioxidant, anti-inflammatory and senolytic effects.
  • In a 2018 mouse study, fisetin was the most potent senolytic of 10 flavonoids tested, and late-life treatment extended median and maximum lifespan. A later multi-site mouse study found no significant lifespan effect.
  • Human data is limited: a review of completed trials found mixed, heterogeneous results, and no trial has established that fisetin extends human lifespan.
  • Doses and schedules differ widely between studies, from intermittent short courses to daily use. People on blood thinners should speak to a doctor or pharmacist first.
  • Vivetus® Fisetine contains 200 mg per capsule, 60 capsules per pack.

Table of Contents

What fisetin is

Fisetin is a dietary flavonol found in strawberries, apples, grapes, onions and cucumbers. Researchers study it for antioxidant, anti-inflammatory and potential senomorphic or senolytic effects. Cellular senescence is linked to age-related disease and chronic inflammation, which is why a compound that acts on senescent cells draws interest from longevity researchers.

Two terms matter:

  • Senolytic: a compound that selectively removes senescent cells.
  • Senomorphic: a compound that changes how senescent cells behave, for example by reducing the inflammatory signals they release, without removing them.

Fisetin is examined under both labels. Food contains it in small amounts. The quantities used in studies are far higher than a normal diet supplies, a gap the Frontiers review lists among the limits on translating the research into practice.

How fisetin may work as a senolytic

Senescent cells resist programmed cell death. The proposed mechanism is that fisetin interferes with anti-apoptotic BCL-2 family proteins, allowing BAX/BAK-mediated apoptosis and the selective clearance of senescent cells. In cell cultures, fisetin induced apoptosis in senescent human umbilical vein endothelial cells and primary mouse embryonic fibroblasts, reducing their numbers by 30 to 70%.

Cell experiments show a mechanism is possible. They do not show what happens in a living person, where absorption, metabolism and tissue exposure all change the picture. For that reason the animal and human results below carry more weight.

For a plain-language walkthrough of absorption and formulation, see our article on how fisetin works.

How fisetin may work as a senolytic

Animal studies: where the longevity interest began

The 2018 Mayo Clinic mouse study

The study most cited in this field is Yousefzadeh et al. (2018). Of 10 flavonoids tested, fisetin was the most potent senolytic. Acute or intermittent treatment of progeroid and old mice reduced senescence markers in multiple tissues. Chronic administration to wild-type mice late in life restored tissue homeostasis, reduced age-related pathology and extended median and maximum lifespan. The authors concluded that reducing the senescent cell burden even late in life can have a significant health impact in mice, and that the findings suggest feasibility for human clinical studies.

Blood vessels in old mice

Mahoney et al. (2023) gave old mice fisetin intermittently: one week on, two weeks off, one week on. Aortic gene expression of Cdkn2a fell by 85%, Cdkn1a by 48% and Serpine1 by 81%. Aortic p16INK4A protein fell by 36%, and several senescence-associated secretory factors, including Ccl2, Mmp3 and Plat, were lower. The study title links this to improved arterial function in old mice.

Reported reductions in four aortic markers

A large-animal model

Huard et al. (2023) treated female sheep aged 6 to 7 years with 100 mg/kg fisetin on two consecutive days a week for 8 weeks. Treated animals showed fewer senescent cells in brain cortex white matter, fewer P16+ and GLB1+ cells in neurons, astrocytes and microglia, and lower plasma S100B. The authors read this as a senolytic effect in a large animal.

A study that did not find a lifespan effect

The evidence is not all one way. The 2024 Interventions Testing Program study by Harrison et al. gave mice fisetin at 600 ppm in food from 20 months of age, either 3 days on and 11 days off or continuously. Lifespan was not significantly affected in either sex of UM-HET3 mice. Different mouse strains, diets and schedules may explain part of the gap between studies, which is why the field treats mouse lifespan results as a reason for further research and not as a conclusion.

What human studies show

Human evidence is early. A review of 34 registered clinical studies found that the four completed trials with available results showed limited and heterogeneous evidence. Some reported favourable metabolic or inflammatory changes, and others found no clear clinical benefit. The same review notes that small samples, multimodal interventions and uncontrolled or exploratory designs make it hard to establish efficacy.

Two other points from the 2026 literature:

  • A separate review concludes that the field is in its infancy and that current human evidence is too limited for firm conclusions on the efficacy and long-term safety of fisetin and quercetin.
  • As of January 2026, 30 clinical trials were underway testing the senolytic properties of flavonoids in other age-related diseases, so more data is expected.

In short, the mouse results explain the interest. They are not proof of an effect on human healthspan or lifespan, and no one can honestly promise one.

Doses and schedules that have been studied

Doses vary a great deal, so a number from one study cannot be applied to another. According to the Frontiers review:

Setting Dose or schedule listed
Animal studies 50 to 100 mg/kg, daily or intermittent, and lifetime daily administration
Human studies 100 mg/day, 500 to 1,000 mg/day, or a single 1,000 mg dose
STOP-Sepsis trial 20 mg/kg as a single dose or two doses a day apart

Source for the table: Frontiers in Nutrition review, 2026.

Two patterns appear. Senolytic research often uses short, intermittent courses, because the idea is to clear cells and then pause. Other work uses lower daily amounts. Which approach suits a person depends on goals, health and medicines, so it is worth discussing with a doctor. Our guides on the two-day fisetin protocol and on 20 mg/kg cycles versus 100 to 500 mg daily describe what the research tested in more detail.

Safety: what is known and what is not

Short-term data is reassuring but narrow:

  • In 15 healthy volunteers, a single 1,000 mg dose of fisetin in a hydrogel formulation produced no significant adverse events.
  • In men with Gulf War Illness who took up to 800 mg daily for one month, side effects were mild: dizziness, fatigue, nausea, headache and gastrointestinal discomfort.
  • In mice, no measurable toxicity signs appeared at doses up to 2,000 mg/kg, and an Ames test found no mutagenicity, according to the Frontiers review.

The limit is duration. The Nutrients review states that the evidence is insufficient to establish the safety of prolonged high-dose use in humans, and that interactions with other medicines are not yet well characterised.

If you take blood thinners or other medicines

Fisetin may mildly reduce platelet clumping. An interactions checker notes that this could add to the effect of anticoagulant or antiplatelet medicines such as warfarin, acenocoumarol or apixaban, and that the concern is a high-dose course rather than food amounts. If you use any of these medicines, ask your GP or pharmacist before starting fisetin. The same applies if you have an upcoming operation, a bleeding disorder, an active cancer diagnosis or a chronic condition, or if you are pregnant or breastfeeding. Our article on fisetin side effects and drug interactions covers these points for Dutch users.

For older relatives, a short list of their medicines taken to the pharmacist is the practical first step. Dutch pharmacists can check combinations against the full medication record.

Fisetin and quercetin

Both are flavonoids and both appear in senolytic research. In the 2018 screening, fisetin was the most potent of the 10 flavonoids tested, and that result is the main reason it has its own line of research. Quercetin is studied too, often alongside other compounds. The two are not interchangeable: they differ in the studies behind them and in the proposed mechanisms. Our overview of fisetin and quercetin sets out uses and evidence side by side, and the broader senolytic research summary puts them in context.

Our perspective

We follow the fisetin literature closely, and our reading is that the science is promising and still developing. The 2018 mouse work, the vascular data and the sheep study give a clear reason to take fisetin seriously as a research compound. The human trials that have reported are small, and we say so.

That is why we build around what the evidence supports. Our Vivetus® Fisetine capsules contain 200 mg each, 60 capsules per pack, and our formulations are transparent: the ingredients are listed, the products are vegan and GMO-free, and they are assembled in the Netherlands. Our products are designed for adults who want to look after healthy ageing as part of a wider routine of diet, movement, sleep and medical follow-up.

For people who want to combine ingredients, our range also includes quercetin, resveratrol, pterostilbene, apigenin, NMN and bundles, so a routine can be built from single, clearly labelled ingredients. We encourage anyone who takes regular medication to discuss any new supplement with a pharmacist or doctor first.

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Choosing a fisetin supplement

When comparing products, check the following on the label and product page:

  1. Amount per capsule. A clear milligram figure makes it possible to compare with the doses in the studies above.
  2. Capsule count and schedule. Intermittent courses use fewer capsules per month than daily use, which changes the cost per month.
  3. Formulation. Absorption of fisetin is a known constraint, so ask how the product addresses it. Our guide to how formulation affects absorption explains the question.
  4. Purity testing and certification. Look for test results and a transparent ingredient list.
  5. Diet fit. Vegan and GMO-free status matters to many buyers.
  6. Delivery. Check shipping terms. Vivetus offers free shipping on orders over €50.

Prices on the Vivetus site are shown on the product pages and may change, so check there for the current figure.

Vivetus® Fisetine

Vivetus® Fisetine, 60 capsules of 200 mg is our single-ingredient option for readers who have read the research and want a defined amount per capsule. The capsules are vegan, GMO-free and assembled in the Netherlands, and one-time or subscription purchase is available.

Vivetus® Fisetine - 60 capsules - 200mg

For a wider routine, the CelReset bundle combines ingredients from our senolytic range, and the full fisetin collection lists every option. Free shipping applies on orders over €50.

Practical guidance for older adults and caregivers

If you are buying for a parent or grandparent, a few steps keep things simple:

  • Collect the current medication list, including over-the-counter products, and show it to the pharmacist before the first capsule.
  • Start with the product’s stated serving and keep a note of the date started and any changes in how the person feels.
  • Do not treat a supplement as a replacement for prescribed treatment or regular check-ups.
  • Report dizziness, nausea, unusual bruising or bleeding to the GP.

Fisetin sits alongside, not instead of, the basics that have much stronger evidence for healthy ageing: varied food with fruit and vegetables, regular movement, enough sleep and routine medical care.

FAQ

Does fisetin extend lifespan?

In one 2018 mouse study, fisetin given late in life extended median and maximum lifespan. A later multi-site mouse study found no significant lifespan effect. No human trial has shown that fisetin extends life.

Is it safe to take fisetin every day?

Short-term human studies reported no significant adverse events at a single 1,000 mg dose and only mild side effects at up to 800 mg daily for a month. Researchers state that the evidence for prolonged high-dose use is not yet sufficient. Ask a doctor or pharmacist if you take regular medication.

Can I take fisetin with blood thinners?

Fisetin may mildly reduce platelet clumping, which could add to the effect of anticoagulants such as warfarin, acenocoumarol or apixaban, mainly at high-dose courses. Speak to your GP or pharmacist before starting.

What is the difference between fisetin and quercetin?

Both are flavonoids studied for senolytic effects. Fisetin was the most potent of 10 flavonoids in the 2018 screening, while quercetin is often studied in combination with other compounds. Our fisetin and quercetin guide compares them in detail.

Sources

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