Fisetin: Uses, Benefits, Dosage & Safety
Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
Quick summary
Fisetin is a plant flavonoid (found in strawberries) studied as a 'senolytic' — a compound that may clear senescent 'zombie' cells linked to ageing. The science is promising but almost entirely preclinical so far.
What is Fisetin?
Fisetin is a flavonoid antioxidant found in strawberries, apples and other plants. It has drawn major interest as a possible 'senolytic' — an agent that selectively clears senescent cells, which accumulate with age and drive inflammation. It's sold as an anti-ageing and 'cellular health' supplement.
What Fisetin is commonly used for
In supplements, Fisetin is most often included for skin & anti-aging support. It is used as nutritional support, not as a treatment for any medical condition — the distinction matters, because the claims on a sales page are often stronger than the evidence allows.
How Fisetin works
In laboratory and animal studies, fisetin appears to trigger the death of senescent 'zombie' cells and to have antioxidant and anti-inflammatory effects. The senolytic concept is exciting, but how well it works in humans, and at what dose, is not yet established.
What the evidence says
Here's an honest snapshot of what published research suggests about Fisetin — including where the evidence is limited.
- Fisetin shows senolytic, antioxidant and anti-inflammatory effects in cell and animal studies, with notable longevity findings in mice. (PubMed research)
- Human clinical trials are only beginning, so benefits and effective doses in people are not yet proven. (PubMed research)
Typical dosage used in studies
Human trials are exploring intermittent high doses; there is no established consumer dose, and absorption is poor. This is research information for context, not a recommendation — confirm what's appropriate for you with a healthcare professional.
Side effects and safety
Appears well tolerated in short studies, but human safety data — especially for the high 'senolytic' doses being researched — are limited.
Medication interactions and who should avoid Fisetin
Medication & safety check
It may affect drug-metabolising enzymes and blood clotting; caution with medications. Long-term safety is unknown.
This is general information, not personal medical advice. If you take any medication, confirm it's safe to combine with Fisetin with your doctor or pharmacist first.
Sources & further reading
The summary above is drawn from peer-reviewed research and authoritative references. For general, authoritative background you can also consult:
- PubMed research on Fisetin
- NIH Office of Dietary Supplements
- NIH National Center for Complementary and Integrative Health
- MedlinePlus (U.S. National Library of Medicine)
Frequently asked questions
What is a senolytic?
A compound that selectively clears senescent 'zombie' cells, which accumulate with age.
Does fisetin slow ageing in humans?
It's promising in animals, but human evidence is not yet established.
Is fisetin safe?
Short studies suggest good tolerability, but long-term and high-dose human safety is unknown.
Where is fisetin found?
Strawberries are the richest common food source.
Related ingredients to explore
Ingredients often studied or formulated alongside Fisetin — useful for understanding the full picture of a formula.