Dietary fisetin is present in meaningful concentrations only in a handful of fruits and vegetables. Strawberries provide the highest concentration at approximately 160 μg/g fresh weight — but a 1,000 mg senolytic dose would require approximately 6.25 kg of strawberries. Diet alone cannot achieve senolytic doses, but chronic dietary exposure may provide cumulative protective benefits.

Is organic strawberry juice a good fisetin source?

Cold-pressed organic strawberry juice retains most fisetin from the flesh and some from the skin. A 250 mL glass provides ~10–15 mg fisetin — beneficial for health but not therapeutic for senolysis.

Does cooking reduce fisetin in food?

Yes. Thermal processing (boiling, baking) reduces fisetin content by 20–40%. Fresh, raw strawberries maximize dietary fisetin intake. Frozen-then-thawed strawberries retain most fisetin.