Fisetin

Not medical advice. Fisetin is discussed here for informational and harm-reduction purposes only. We do not endorse use, and any dosing context is informational, not a protocol.

Also known as	3,7,3',4'-tetrahydroxyflavone
Category	Supplement
native_region	Strawberries, apples, cucumbers (worldwide)
active_compounds	Fisetin flavonoid, related polyphenols
US legal status	Fisetin is a lawful dietary supplement under DSHEA. Not FDA-approved for medical use. Naturally present in strawberries, apples, cucumbers, and other foods.

What is Fisetin?

A flavonoid polyphenol found in various plant foods. Fisetin is studied for antioxidant, anti-inflammatory, and potential neuroprotective properties. Often marketed for longevity and brain health support.

How it works

Fisetin activates SIRT1 and other longevity-associated pathways; may promote clearance of senescent cells. Acts as direct antioxidant and anti-inflammatory via flavonoid structure.

Background & history

Identified in strawberries and foods for decades; modern supplement interest emerged from longevity research (2000s-2010s) exploring senolytic compounds.

What the research says

Limited human clinical evidence. Animal studies show potential antioxidant, anti-inflammatory, and neuroprotective activity. In vitro work suggests senolytic (cellular aging) effects, but human evidence for longevity or brain benefits remains preliminary and speculative.

Reported effects

Reported to have antioxidant properties
Studied for potential neuroprotective activity in animal models
Anecdotal reports of cognitive support
May have anti-inflammatory properties
Theoretical senolytic activity (animal evidence only)

Dosing & administration (informational)

Limited human data suggests 50-500 mg daily potential range from animal extrapolation. No established human protocol; consult healthcare provider.

This is general research/context information, not medical advice or a recommended protocol.

Safety & side effects

Generally well-tolerated; adverse events rare in limited studies
Long-term human safety data very limited
Not recommended in pregnancy/breastfeeding
Theoretical interactions with CYP enzymes; evidence unclear
No established contraindications with common medications in humans

Drug & supplement interactions

Theoretical CYP enzyme interaction (unclear in humans)
Possible mild effects on drug metabolism
No documented major herb-drug interactions
Safe with most common medications

Who should avoid it

Pregnancy and breastfeeding
High-dose use beyond research-based exploration
Supplementation without medical guidance

How it is commonly combined

Combines with other senolytic compounds (quercetin, pterostilbene) or antioxidant polyphenols for complementary effects.

Legal & regulatory. Fisetin is a lawful dietary supplement under DSHEA. Not FDA-approved for medical use. Naturally present in strawberries, apples, cucumbers, and other foods.

Quality & harm reduction

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Lab testing & harm-reduction tools

If you are going to research a compound, verifying identity and purity is the single most protective step. Independent analytical testing and sterile-handling supplies reduce risk.

Compare testing options

Frequently asked questions

Is fisetin a senolytic?

Animal studies suggest potential senolytic effects. Human evidence for cellular aging effects does not exist yet.

Can I get fisetin from strawberries?

Yes, strawberries are a good natural source. Supplements deliver much higher concentrated doses.

Is it safe long-term?

Limited long-term human data. Discuss chronic supplementation with a healthcare provider.

Does fisetin work better with other compounds?

Animal research suggests synergy with other senolytic compounds; human research lacking.

Will fisetin extend my lifespan?

No human lifespan studies exist. Animal research is preliminary; supplement marketing often exceeds evidence.