Fisetin
What the trials found
Fisetin does not yet have enough human evidence to establish meaningful improvements across longevity, inflammation, or everyday health outcomes.
- 2 papers
- 0 of 13 outcomes
- 4 major interactions
Risk, worst reported severity
- Swollen lymph node (bacterial infection) leading to self-withdrawal moderate
- bloating mild
- antithrombotic agents major
- antineoplastic agents major
Dose, timing & forms
How much
The available human evidence is too limited to support a dependable general fisetin dose for inflammation, energy, weight, or longevity. The trial evidence reviewed here is short-term and marker-focused, so avoid treating a label's high-dose protocol as an evidence-based target for long-term use.1
When and how long
Human research does not yet establish a best time of day, a need for split dosing, or whether fisetin works better with food. Consistency matters more than chasing a specific clock time if a clinician has cleared you to use it, but current evidence does not show that timing changes outcomes.1
Forms & standardisation
Look for a product that clearly states the amount of fisetin per serving, rather than relying on a vague fruit or botanical blend. There is not enough human research to identify a best extract, absorption-enhanced form, or active-compound standardization, so proprietary claims deserve extra skepticism.1
Adverse events and drug interactions
Safety events
Drug interactions
What this is and how it works
- One randomized trial reported inflammatory-status changes in patients with type 2 diabetes, without a quantified consumer-relevant effect size.1
- Two papers reviewed here span 13 outcomes, with human evidence concentrated on biomarkers rather than everyday health outcomes.
- Evidence remains limited to small human research and cannot establish broad longevity benefits.
Fisetin is a flavonoid, a natural pigment found in foods such as strawberries, apples, onions, and persimmons. Supplement capsules deliver far more than you would usually get from food, which makes the clinical research, not the ingredient's social media reputation, the part that matters.
Researchers are exploring whether fisetin turns down NF-kB, a cellular fire alarm that tells the body to keep making inflammatory signals. In the available human trial, supplementation changed inflammatory markers in adults with type 2 diabetes, but that result does not prove the full mechanism or a noticeable health benefit.1
Bottom line
Fisetin is for people who understand they are buying into an early research area, not a proven longevity or inflammation tool. The limited human evidence shows biomarker changes rather than clear everyday outcomes.1 Skip self-experimenting if you take prescription medicines or have complex medical care, unless the clinician managing that care approves it.
Common questions
What does fisetin do in the body?
Does fisetin reduce inflammation?
Is fisetin a proven longevity supplement?
Who should avoid fisetin supplements?
Sources
Sources
Generated August 27, 2026