Evidence-based·Last reviewed May 30, 2026·How we grade evidence

Fisetin

PhytochemicalFlavonoidBest with a meal

Useful mainly for experimenters interested in senolytic/anti-aging research, with no proven human benefit yet.

Quick decision guide

May help most

experimenters interested in senolytic/anti-aging research, with no proven human benefit yet

Common dosing range

100–500 mg/day

When to expect effects

Unknown in humans

Watch out for

human clinical evidence is essentially absent; bioavailability is poor (<5%)

What is it

Fisetin is a flavonol polyphenol found in fruits and vegetables including strawberries, apples, persimmons, grapes, and onions. It has gained attention as a senolytic compound under investigation for its potential to selectively clear senescent cells associated with aging.

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

You want a dietary flavonol with antioxidant activity and accept the evidence is preliminary
You are following a clinician-supervised senolytic research protocol

Probably skip if…

You expect a proven anti-aging or longevity effect in humans
You want measurable symptom or disease outcomes
You are pregnant, on anticoagulants, or in cancer treatment

Evidence at a glance

senescent cell clearance (anti-aging)

Mixed Evidence
Effect
Unproven in humans
Best fit
studied only in aged mice and cell models
Time
Unknown in humans

antioxidant capacity

Mixed Evidence
Effect
Modest
Best fit
general antioxidant interest
Time
Unknown in humans

Evidence for 2 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

senescent cell clearance (anti-aging)

Mechanism only
Mixed Evidence

Fisetin is a senolytic in preclinical work, selectively clearing senescent cells and extending median lifespan in mice. Human clinical trials are ongoing but very limited, and no senolytic or anti-aging outcome has been demonstrated in people. Poor bioavailability further complicates translation to human dosing.

Effect size
Unproven in humans
Time to effect
Unknown in humans
Best fit
studied only in aged mice and cell models
Less likely
anyone expecting a demonstrated human longevity or healthspan effect

Bottom line: Mechanistically interesting but unproven in humans; treat anti-aging claims as hypothetical.

antioxidant capacity

Mechanism only
Mixed Evidence

Fisetin scavenges reactive oxygen species, chelates metals, and activates Nrf2 antioxidant signaling in laboratory and animal studies. It also inhibits NF-kB-driven inflammatory signaling. These are mechanistic and biomarker-level findings without controlled human outcome data.

Effect size
Modest
Time to effect
Unknown in humans
Best fit
general antioxidant interest

Bottom line: Plausible antioxidant activity in lab models, but no proven clinical benefit.

SourceKoriem et al., 2023 — PubMedWu et al., 2022 — PMC

How it works

Fisetin's most discussed property is its senolytic activity, which refers to its ability to selectively induce apoptosis in senescent (aging, dysfunctional) cells while sparing healthy cells. Senescent cells accumulate with age and contribute to chronic inflammation, tissue dysfunction, and age-related disease through their secretion of inflammatory cytokines (the senescence-associated secretory phenotype, or SASP). Research suggests fisetin works as an antioxidant, scavenging reactive oxygen species and chelating metals. It modulates several signaling pathways including PI3K/AKT/mTOR and Nrf2, with downstream effects on cell survival, autophagy, and antioxidant defenses. Fisetin also has anti-inflammatory effects mediated by NF-kB inhibition. Preclinical animal studies show fisetin can reduce senescent cell burden, improve healthspan markers, and extend median lifespan in mice. Human clinical trials are ongoing but very limited. Bioavailability is poor (typical absorption under 5%); enhanced formulations have been developed to improve plasma levels.

How to take it

1. Typical dose
100–500 mg/day for general use
2. Higher studied dose
Intermittent 1500–2000 mg/day for 2 consecutive days (senolytic protocols)
3. Timing
With a meal
4. With food
With food containing fat to aid absorption
5. How long to try
No validated human duration; trial periods are speculative

What to track

GI tolerance
headache
any subjective energy change

3 commercial forms

Compare the main delivery options and what they’re best suited for.

Standard fisetin extract

Common supplement form. Pure fisetin or extracts standardized to fisetin content.

Poor oral absorption (under 5%); high doses needed for systemic effects.

Liposomal or phospholipid fisetin

Premium formulations aiming to overcome bioavailability limitations.

Marketed for improved absorption; clinical evidence specific to enhanced forms is limited.

Fisetin with quercetin (senolytic combination)

Used in some senolytic research protocols.

Combined senolytic activity; both compounds have similar mechanisms.

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

mild GI upsetheadache

Who should avoid it

  • pregnant or breastfeeding women
  • people on anticoagulants or near surgery
  • people in cancer treatment without oncologist clearance
  • those allergic to source fruits

Pregnancy & breastfeeding

Avoid during pregnancy and breastfeeding due to insufficient safety data.

Interactions

anticoagulants/antiplateletsModerate

possible mild antiplatelet effect may add to bleeding risk

chemotherapy/radiationModerate

effects on cancer treatment outcomes are unknown

CYP450-metabolized drugsMinor

may inhibit certain CYP450 enzymes and alter drug levels

Documented interactions

Evidence-graded pair pages with sources, dosing notes, and timing guidance — a complement to the narrative section above.

Beneficial pairs (1)

+ quercetin

synergy

Fisetin and quercetin are structurally related dietary flavonols with overlapping antioxidant and anti-inflammatory activity, both studied as candidate senolytics. They are often combined in longevity-oriented supplement stacks, but the robust human senolytic evidence is for dasatinib plus quercetin, not for the fisetin-plus-quercetin pairing, which rests largely on animal and mechanistic data. The combination is generally well tolerated; the main practical consideration is that both flavonoids can affect platelet function and drug metabolism, so anyone on prescription medication should check with a clinician.

See all 1 Fisetin interaction →

Food sources

Strawberries (1 cup)

Amount
approx 5-7 mg fisetin (highest dietary source)
%DV
—

Apple (1 medium, with skin)

Amount
approx 1-3 mg fisetin
%DV
—

Persimmon (1 medium)

Amount
approx 1-2 mg fisetin
%DV
—

Grapes (1 cup)

Amount
approx 1 mg fisetin
%DV
—

Onions (1 cup)

Amount
approx 1 mg fisetin
%DV
—

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

standardized fisetin content
bioavailability-enhancing formulation
third-party identity/potency testing

Be skeptical of…

'reverses aging'
'clears senescent cells' as a human-proven effect
'extends lifespan'

Frequently asked questions

What are senolytics?⌄

Senolytics are compounds that selectively kill senescent cells, which are aging dysfunctional cells that accumulate with time. Fisetin is one of the most-studied natural senolytic compounds.

Will fisetin make me live longer?⌄

In mice, fisetin extends median lifespan and improves healthspan. In humans, clinical trials are still in early stages. There is no evidence yet that fisetin extends human lifespan.

What dose of fisetin should I take?⌄

General use doses range from 100-500 mg daily. Some senolytic protocols use very high doses (1500-2000 mg per day) for 2 days every few weeks. Consult a clinician before high-dose protocols.

Should I take fisetin daily or intermittently?⌄

For general antioxidant use, daily moderate doses are common. Senolytic protocols use high doses intermittently. Optimal regimens for human health benefits are still being studied.

Can I get enough fisetin from food?⌄

Strawberries are the highest food source but provide only several milligrams per cup. Achieving supplement-level doses through food alone is impractical.

References by claim

antioxidant capacity

Koriem et al., 2023 — PubMed (2023) link

Wu et al., 2022 — PMC (2022) link

Track Fisetin with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store
Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.