Fisetin Research Overview (also known as 3,3′,4′,7-tetrahydroxyflavone, Fisetol, Fisetin hydrate)
Fisetin is a naturally occurring flavonoid found in foods such as strawberries, apples, and onions and studied for antioxidant, anti-inflammatory, neuroprotective, and senolytic activity. Preclinical research suggests that fisetin can influence PI3K-AKT, NF-kB, Nrf2, and apoptosis-related pathways and may selectively reduce senescent-cell burden, but human evidence for longevity or senolytic effects remains limited.
What Is Fisetin?
Fisetin is a plant-derived flavonol, a subgroup of polyphenolic compounds characterized by a three-ring structure and multiple hydroxyl groups. It occurs in small amounts in strawberries, apples, persimmons, grapes, onions, and some other fruits and vegetables. Its chemical name is 3,3′,4′,7-tetrahydroxyflavone, and its molecular formula is C15H10O6. Fisetin is investigated as a research compound because it can interact with redox-sensitive signaling, inflammatory transcription factors, protein kinases, and pathways that regulate cell survival and programmed cell death.
In longevity research, fisetin is best known as a candidate senotherapeutic or senolytic compound. Senescent cells are metabolically active cells that have undergone a durable cell-cycle arrest and may secrete inflammatory mediators collectively described as the senescence-associated secretory phenotype, or SASP. Cell-culture and animal studies suggest that fisetin can reduce selected senescent-cell populations and improve some age-associated phenotypes in experimental models. These findings do not establish that oral fisetin extends human lifespan, reverses aging, or safely clears senescent cells in people. Human pharmacokinetic, dose-finding, and controlled efficacy data remain comparatively limited.
Research Indications
Senescent Cell Targeting
Preclinical senolytic activity
Cell and animal studies identify fisetin as a flavonoid capable of preferentially reducing markers and burden of some senescent cell populations.
Intermittent dosing research
Mouse senotherapeutic experiments generally used intermittent rather than continuous administration; whether this translates to humans remains unestablished.
Cellular Stress & Inflammation
Antioxidant-response signaling
Experimental work suggests effects on oxidative-stress pathways and stress-responsive transcriptional signaling, although bioavailability limits direct extrapolation.
Inflammatory pathway modulation
In vitro and animal studies report modulation of inflammatory mediators; clinical effects in generally healthy adults are not yet established.
Healthspan & Age-Related Outcomes
Mouse healthspan findings
Late-life fisetin treatment improved selected health and lifespan measures in mouse models; these findings cannot demonstrate human longevity benefit.
Human clinical investigation
Human studies remain limited and are primarily exploratory. No fisetin regimen is proven to prevent aging or age-related disease.
Research Protocols
As reported in cited literature and research-community logs (see Research Citations below) — not a personal dosing recommendation.
| Research Application | Dose | Frequency | Route |
|---|
| Dietary-flavonoid intake | 100–250 mg | Once daily | Oral |
| Supplement research practice | 250–500 mg | Once daily | Oral |
| Senotherapy trial design | 20 mg/kg/day | 2 consecutive days; intermittent cycles | Oral |
| Higher-dose exploratory use | Up to 1,000 mg | Intermittent; not standardized | Oral |
Timing
Fisetin is commonly taken with a meal containing dietary fat because it is poorly water-soluble. Intermittent high-dose schedules are investigational and should not be assumed equivalent to daily supplement use.
Peptide Interactions
Both are dietary flavonoids studied for overlapping antioxidant and senescence-related pathways; combined clinical efficacy and safety are not established.
Dasatinib plus quercetin is a distinct investigational senolytic approach. Do not substitute or combine fisetin with prescription oncology drugs without specialist oversight.
Flavonoid supplements may affect platelet-related pathways or drug metabolism. People using anticoagulant or antiplatelet therapy should seek clinician guidance.
Preclinical metabolic effects create a theoretical risk of additive glucose lowering when used with antidiabetic medicines; monitor only with clinical advice.
No specific clinically established interaction is known, but combining multiple bioactive polyphenol supplements can complicate tolerability and attribution of effects.
Reported Research Timeline
01First dose to 24 hours (reported in cited studies): most people should not expect a perceptible acute effect; mild gastrointestinal discomfort can occur.
02Days 2–7 (reported in cited studies): assess tolerability, including appetite, nausea, headache, stool changes, or rash, especially when beginning a new supplement.
03Weeks 2–4 (reported in cited studies): subjective changes in energy, recovery, or wellbeing are nonspecific and cannot be used as evidence of senescent-cell clearance.
04Weeks 4–12 (reported in cited studies): any research-oriented monitoring should focus on safety and clinician-selected health measures, not unvalidated “senescence” biomarkers.
05Months 3+ (reported in cited studies): no human timeframe has been validated for anti-aging, disease-prevention, or longevity outcomes from fisetin supplementation.
Safety Notes
Included for harm-reduction awareness only, in the event this compound is encountered outside its labeled research use. Inclusion here does not imply RUO Codes endorses, recommends, or instructs human use.
Human long-term safety data for high-dose or intermittent fisetin protocols are limited.
Use caution with prescription medicines, particularly anticoagulants, antiplatelet agents, glucose-lowering drugs, and medicines with narrow therapeutic windows.
Avoid self-directed high-dose use during pregnancy or breastfeeding because adequate safety data are unavailable.
People with active cancer, planned chemotherapy, liver disease, kidney disease, or upcoming surgery should discuss use with their treating clinician.
Stop use before elective procedures only according to advice from the surgical or prescribing team.
Seek Medical Attention If:
You develop signs of a severe allergic reaction, including facial swelling, wheezing, trouble breathing, or widespread hives.
You have unusual bleeding, black stools, vomiting blood, or rapidly spreading bruising.
You experience severe or persistent abdominal pain, repeated vomiting, fainting, or symptoms of clinically significant low blood glucose.
You develop yellowing of the skin or eyes, dark urine, or other symptoms suggesting possible liver injury.
Quality Indicators
Verified Marker
Batch-specific certificate of analysis
Look for a lot-matched COA identifying fisetin, assay result, batch number, test date, and laboratory method.
Verified Marker
Independent identity and purity testing
Prefer products with third-party HPLC or UHPLC testing that documents identity and a stated fisetin purity, rather than an unlabeled botanical blend.
Verified Marker
Contaminant screening
A quality report should include heavy-metal and microbiological testing, with results and specification limits available for the finished product.
Acceptable Range
Clear capsule and dose disclosure
The label should state milligrams of fisetin per capsule and serving, excipients, capsule material, suggested storage, and a traceable lot number.
Quality Concern
Unverifiable potency or proprietary blends
Avoid products lacking a COA, using only generic “polyphenol complex” claims, or making implausible purity and anti-aging claims without supporting analysis.
Research Citations
- Fisetin is a senotherapeutic that extends health and lifespan.
Yousefzadeh, M.J., Zhu, Y., McGowan, S.J., et al., 2018, EBioMedicine - The Achilles' heel of senescent cells: from transcriptome to senolytic drugs.
Zhu, Y., Tchkonia, T., Pirtskhalava, T., et al., 2015, Aging Cell - Fisetin: a dietary antioxidant for health promotion.
Khan, N., Syed, D.N., Ahmad, N., et al., 2013, Antioxidants & Redox Signaling - Fisetin, a novel dietary flavonoid, suppresses the proliferation and survival of human cancer cells.
Sundarrajan, S., Keerthikumar, S., Samykutty, A., et al., 2013, Free Radical Biology and Medicine
Research Focus
longevity, senolytic research, cellular senescence, neuroprotection, oxidative stress, inflammation, mitochondrial biology, flavonoid pharmacology
Frequently Asked Questions
What should researchers watch for with Fisetin?
Included for harm-reduction awareness only, in the event this compound is encountered outside its labeled research use. Inclusion here does not imply RUO Codes endorses, recommends, or instructs human use.
What should researchers expect over time with Fisetin?
First dose to 24 hours (reported in cited studies): most people should not expect a perceptible acute effect; mild gastrointestinal discomfort can occur.
How is Fisetin typically administered in research?
As reported in cited literature and research-community logs (see Research Citations below) — not a personal dosing recommendation.
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