Fisetin

fisetin

A plant flavonoid studied as a senolytic to clear senescent cells.

TypeSupplement / dietary

The grade answers: What does the human evidence support for: Senolytic action?

Grade

Limited

The grade rates evidence quality — it is not advice to take or buy.

Class: Senolytics
Primary use: Senolytic action
Evidence strength: low
Last reviewed: 2026-07-01

Bottom line

One of the more promising natural senolytics in the lab — but the human evidence is still in progress. Clinical trials are underway; the results aren't in. Treat current claims as preliminary.

What the evidence says

Fisetin extended healthspan and reduced senescent-cell burden in animal models and is among the most-studied natural senolytics preclinically. Human trials (for example in frailty and inflammation) are ongoing but have not yet delivered clear efficacy data, and — as with quercetin — its oral bioavailability is limited. Grade C reflects genuine preclinical promise sitting on top of an immature human evidence base. The gap between 'works in mice' and 'proven in people' is exactly where the marketing tends to skip.

Key studies

[1]
Fisetin as a senolytic extends healthspan in mice · preclinical
Reduced senescent-cell markers and improved healthspan in animals.
Open on PubMed ↗
[2]
Fisetin clinical trials in aging / frailty · trial
Human trials ongoing; efficacy not yet established.
Open on PubMed ↗
[3]
Flavonoid senolytics (review) · review
Positions fisetin among candidate natural senolytics.
Open on PubMed ↗

See all studies on PubMed ↗

Scoped PubMed search, not a curated bibliography: the individual PMIDs for this entry have not yet been verified one by one. For that reason it is not used to support a high grade and is awaiting review.

Mechanism

Proposed senolytic activity by pushing senescent cells toward apoptosis, alongside general antioxidant and anti-inflammatory flavonoid effects.

Safety

Consumed as a dietary flavonoid (strawberries, apples) with good tolerability at food levels. The high intermittent 'senolytic' doses used in research are less characterised for long-term safety.

Dosage context

Research uses intermittent high-dose ('hit-and-run') regimens; supplement doses and bioavailability vary widely. No validated human protocol yet exists.

Examples of application

Eaten in small amounts in strawberries and apples.
As a senolytic, used in intermittent high-dose research protocols only.
Best treated as 'watch the trials' than a daily staple.

From the field

Fisetin is often sold as if the human trials were already positive. They aren't finished. We grade it C and will revisit the day the clinical data actually land.

Related molecules

QuercetinC

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