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Fisetin is great for reducing inflammation and all things related to brain function.  There’s a variety of health promoting and disease-preventing benefits.

What is Fisetin?

Fisetin is a flavonol, a chemical that belongs to the flavonoid group of polyphenols. Fisetin is a type of plant pigment that gives color to many fruits and vegetables (R, R1).

Fisetin Snapshot


  • Great for reducing inflammation
  • Improves brain function and memory
  • Great antioxidant
  • Natural pain killer
  • Increases the master antioxidant – Glutathione
  • Maintains stable blood sugar
  • Good for a diverse array of conditions


  • It’s relatively new supplement, and it doesn’t have a lot of research about negative effects.  I personally take it, to good effect.

Health Benefits of Fisetin

Note that there are very few trials of fisetin with humans and nearly all of the studies listed here are done on animals.

1) Fisetin is Good For Your Brain

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Fisetin Encourages New Brain Growth

Out of a number of studied flavanoids, fisetin was found to be the most effective at causing new brain growth (R).

One of the reasons fisetin possesses so many brain-boosting effects is because it is able to cross the blood brain barrier (R).

Fisetin Improves Memory

Fisetin supplementation increases the strength of long term memory pathways (by modifying ERK signaling and increasing BDNF), so it might be useful for memory disorders like Alzheimer’s (RR1).

Fisetin Protects Against Brain Degeneration

Fisetin has been shown to regulate a number of pathways (e.g. antioxidant & mitochondrial function) that are implicated in age-related decline in brain health (R).

One mechanism by which fisetin might protect against degenerative brain conditions is by activating certain transcription factors such as Nrf2 that increase the cellular levels of glutathione – a key cellular antioxidant that has protective effects on nerve cells (RR1).

Fisetin protects nerve cells from oxidative stress. Oxidative death is one of the many factors associated with cognitive decline, stroke, Alzheimer’s, and Parkinson’s disease (R).

Moreover, Fisetin limits the accumulation of harmful compounds (phosphorylated tau) that accumulate in the brain and cause Alzheimer’s disease (R).

Alzheimers is characterized by an accumulation of amyloid beta. Fisetin has been found to protect the brain of mice against damage caused by effects of these usually neurotoxic compounds (R).

In fact, fisetin was convincingly shown to reduce the impact, and slow the progression of, Huntington’s disease in animal models (by activating the ERK cascade) (R, R1).

Fisetin is a potentially useful supplement for decreasing inflammation in microglia – immune cells that exert neurotoxic effects and are often activated in neurodegenerative conditions (see Dr Younger speak about Microglia) (R).

Fisetin Decreases Brain Damage After Stroke

In one study, mice treated with fisetin showed a reduction in behavioral abnormalities after a stroke compared to the untreated mice (R).

Another study confirmed that fisetin helps to protect whichever part of the brain is starved of blood flow during a stroke (R).

Ten flavonoids including fisetin were tested for their ability to protect brain cells against glutamate toxicity. Fisetin was one of four that were found to increase antioxidant defenses enough to limit toxicity (R).

Fisetin Minimizes Brain Damage From Injury

Traumatic epilepsy is a condition of repeated seizures after a head injury. One study showed that epileptic rats experienced less brain damage from their seizures when given fisetin – probably because Fisetin inhibits oxidative stress (R).

Rodents given high dose (50mg/kg of bodyweight) fisetin had significantly better neurological function and reduced brain swelling after brain injury – maybe because fisetin inhibits TLR 4/NF-κB mediated inflammatory pathways (R).

Fisetin is Neuroprotective

Fisetin exerts neuroprotection against Aluminium chloride induced brain pathology (R, R1).

Fisetin decreases elevated levels of ammonia in blood (hyperammonemia) that might affect vital brain functions in hyperammonemic rats (R).

Fisetin promotes nerve cell survival from trophic factor (helping molecules that allow neuron to develop and maintain connections with its neighbours) withdrawal by the enhancement of proteasomal activity (R).

Fisetin increases SIRT1, a protein linked to longevity that has been shown to be neuroprotective (R).

2) Fisetin May Treat Depression

Fisetin is a potent anti-depressant that can increase serotonin and noradrenaline in mice (by inhibiting MAOA) (R).

Fisetin-treated mice demonstrated fewer symptoms of depression and anxiety as a result of pain (R).

Fisetin’s anti-depressant effects can be enhanced with 5-HTP (R).

3) Fisetin Has Anti-Inflammatory Properties

Fisetin inhibits the activity of lipoxygenases (enzymes that act on fatty acids), thereby reducing the production of pro-inflammatory compounds (eicosanoids) and their by-products (RR).

Fisetin may be a promising candidate in the treatment of inflammatory bowel disease (IBD) (R).

Treatment with fisetin suppresses activation of mast cells, demonstrating its potential use as an anti-inflammatory (R).

High blood sugar in diabetics can cause inflammation of the blood vessels and lead to serious damage. These inflammatory processes are inhibited by treatment with fisetin (possibly via inhibition of the HMGB1 signaling pathway) (R, R1).

Fisetin can relieve allergic reactions by inhibiting inflammatory cytokine production (IL-4 and IL-13) by Basophils (R).

Fisetin was found to be an effective treatment for Eczema in animals as it reduced the presence of inflammatory cytokines, eosinophils, mast cells and T-cells (CD4+ & CD8+) that are typically found in atopic dermatitis skin lesions (R).

4) Fisetin May Prevent and Treat Cancer

The following studies are performed in animals and/or cells…Speak to your doctor if you have cancer.

Fisetin induces cell death and inhibits the growth of various types of cancers (e.g. melanoma, pancreatic cancer, colon cancer, lung cancer and prostate cancer) (R).

Numerous studies have concluded that fisetin should be developed for treatment of cancers that have proved resistant to chemotherapy (RR1).

Fisetin inhibits the pathways responsible for cell growth and survival that are overactive in cancer patients (R).

Fisetin inhibits the ability of cancer cells to invade healthy tissues (R).

Fisetin inhibits cell proliferation and causes programmed death of chronic myeloid leukemia (white blood cell cancer) cells and possibly other leukemias (R, R1).

Treatment with fisetin was able to kill acute monocytic leukemia cells by increasing levels of nitric oxide and Ca(2+) and activating pathways of apoptosis (cell death) (R).

Aflotoxin is one of the most potent carcinogens known to man. Fisetin was found to reverse oxidative damage in the livers of rats with aflotoxin-induced cancer (R).

Treatment with fisetin reduced tissue lesions and lipid peroxidation in the lungs of mice exposed to Benzo(a)Pyrene (a carcinogenic chemical) (R).

A diet rich in fisetin might help prevent and treat prostate cancer (by inhibiting urokinase plasminogen activator, altering genes that regulate cell cycles, and causing cancer cell death) (R, R1, R2).

Fisetin might exert anti-cancer effects by inhibiting the mTOR pathway (R).

Fisetin inhibits MMP-1 activity, which regulates important enzymes in cancer growth (R).

Fisetin is such a promising anti-cancer agent because it appears to inhibit and kill cancers without severely affecting the surrounding normal cells – probably because it is able to identify the unique cell-signaling pathways used by cancer cells (R, R1,R2).

5) Fisetin Improves Blood Flow & Lowers Blood Pressure

Fisetin lowers the clumping together (coagulation) of blood cells in mice and, thus, lowers the chance of blockages (R)

By inhibiting Ca(2+) signaling, Fisetin helps reverse vasoconstriction caused by the release serotonin and phenylephrine (R).

Fisetin was able to reverse bad circulation in mice caused by a high fat diet (R).

A rodent study found that Fisetin relaxes drug-induced contraction of blood vessels and, thus, lowers blood pressure. This action occurs regardless of blood vessel function (R).

6) Fisetin May Help Treat Diabetes

Fisetin lowers the elevation of MG-protein glycation that is associated with diabetes and, therefore, may have potential therapeutic use for the treatment of diabetic complications (R).

Diabetic mice fed a diet high in Fisetin stayed diabetic, but the kidney abnormalities normalized (R).

Fisetin administration normalized the increased levels of lipid content in blood, liver and kidney in drug-induced diabetic rats (R).

In diabetic mice, Fisetin reduced the expected formation of cataracts (R).

Fisetin increases HDL and lowered LDL in diabetic rats (R).

Fisetin reduced anxiety-related behaviors in diabetic mice.

Fisetin improved mitochondrial function in diabetic rats (R).

Fisetin maintains stable blood glucose levels by increasing insulin sensitivity, resulting in a lower HbA1C (R, R1, R2).

Fisetin regulates carbohydrate metabolism by modulating the key regulatory enzymes in the liver and kidney tissues of diabetic rats (R).

7) Fisetin May Extend Lifespan

A number of studies have found that fisetin activates SIRT-1, a gene that has been repeatedly associated with long lifespan; in fact, it is often referred to as the longevity gene (R, R1, R2).

Dietary supplementation with a strawberry extract (which is said to have the highest levels of fisetin) improved the performance of rats in a rodent model of accelerated aging (R).

8) Fisetin May Lower Body Weight

In mice, fisetin supplementation reversed the weight gain caused by a high fat diet (R).

Mice that underwent fisetin treatment had less weight increase than mice that did not undergo treatment (R).

Fisetin prevents diet-induced obesity by regulating cell growth (R).

9) Fisetin Lowers Pain

In one study, mice were subjected to pain by altering their sciatic nerves. Mice treated with fisetin experienced less pain than the untreated mice (R).

Fisetin treatment can delay or lower the heightened sensitivity to pain associated with type 1 diabetes (R).

Fisetin’s pain reducing effects can be enhanced with 5-HTP (R).

10) Fisetin Protects Bone

In mice with estrogen deficiency or inflammation, the consumption of fisetin resulted in less bone density loss. Bone mineral density and bone markers positively correlated with the amount of fisetin consumed (R).

Therefore, fisetin might be an effective tool for preventing age-related or inactivity-related (e.g. when injured) loss of bone density.

11) Fisetin Protects Skin From Sun Damage

Fisetin lowers the expression of various genes associated with skin aging (COX-2, MMP-1, MMP-3, MMp-9) that are usually induced by UVB exposure (R).

Fisetin inhibits UVB-induced collagen degradation – a key factor in skin aging (R).

Fisetin reduced  the cellular levels of UV-induced reactive oxygen species, prostaglandin E2, and nitric oxide generation (R).

12) Fisetin Prevents Toxicity

A study found that drug-induced kidney toxicity was lower in rats given fisetin via inhibiting Nf-kB and activating antioxidant defense (R).

As such, it might be a wise idea to take fisetin if you are taking any substance that affects the kidneys, such as: pain medications, alcohol, antibiotics and laxatives (R). (Speak to your doctor.)

13) Fisetin Helps Maintain Energy Levels

Fisetin is able to enhance and maintain ATP levels during oxidative stress (R), by maintaining ATPase activity (R).

14) Fisetin Can Treat Infections

Fisetin is a promising anti-fungal that is less toxic than prescription ones (RR).

One study found that fisetin was antifungal and might be a useful therapeutic treatment for cryptococcosis infections (R).

Fisetin inhibits the Listeria infection (R).

Fisetin inhibits arginase, a key enzyme in the Leishmania amazonensis infection and, therefore, could be used as a food supplement in Leishmaniasis treatment (R).

15) Fisetin is a Mast Cell Inhibitor and Can Help Histamine Intolerance

Fisetin has been found to reduce activation of mast cells (RR).

Natural Sources of Fisetin

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As shown in the picture above, you can find small amounts of fisetin in many fruits and vegetables, with the highest natural source being strawberries. However, to get a truly therapeutic dose I recommend supplementation.

Buy Fisetin

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The information on this website has not been evaluated by the Food & Drug Administration or any other medical body. We do not aim to diagnose, treat, cure or prevent any illness or disease. Information is shared for educational purposes only. You must consult your doctor before acting on any content on this website, especially if you are pregnant, nursing, taking medication, or have a medical condition.


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  • Francisco EHS

    The two times I have taken it, gave me a terrible dizziness.

  • Phyllis

    I have heard that Fisetin may block Iodine, I have low functioning Thyroid and I take synthyroid should I also be taking iodine? Can I still take Fisetin but not at the same time as the synthyroid?

  • Rich

    Joseph – The more I see of your work, the more you amaze me. I just purchased a Joov light source based on your discussion with Dr. Hamblin. Thank you. You are doing a great service to the interested.
    Joseph – One question – How much fisetin do you take daily? No where have I seen any sort of reference quantify for daily consumption.

    1. Nattha Wannissorn, PhD
  • Mary D.

    Do you supplement with only 1 tablet per day? Also are you familiar with Swanson Ultra Veg Caps Fisetin Novusetin?

  • Phil

    Since it inhibits MAOA it wouldn’t be suitable for MAOA gene mutations, correct?

    1. Joseph M. Cohen


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