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TL;DR — Strawberries top the food list at 160 µg/g fisetin. To reach 100 mg/kg senolytic dose (~7 g/day for a 70 kg adult) you'd need ~44 kg of strawberries. Supplements deliver consistent dosing.
What This Page Explains
Fisetin is naturally present in several common fruits and vegetables, leading to a natural question: can dietary sources provide enough fisetin to achieve the effects seen in research? This page compares dietary fisetin intake from food sources with supplemental doses used in clinical trials.
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Detailed Evidence
Strawberries are the richest dietary source of fisetin, containing approximately 160 μg per gram of fresh weight. A typical serving of strawberries (150 g, about 1 cup) provides approximately 24 mg of fisetin. Other notable sources include apples (26.9 μg/g, mainly in the skin), persimmons (10.5 μg/g), lotus root (5.8 μg/g), onions (4.8 μg/g), and grapes (3.9 μg/g). Estimated typical dietary fisetin intake in Western diets ranges from 0.2 to 1.4 mg per day. Clinical trials investigating fisetin's senolytic properties use doses of approximately 1400 mg per day (20 mg/kg). To obtain 1400 mg of fisetin from strawberries alone, you would need to consume approximately 8.75 kg (19.3 lbs) of fresh strawberries in a single day.
Evidence Hierarchy
Systematic Reviews & Meta-Analyses
Multiple high-quality trials combined
Randomized Controlled Trials (RCTs)
Gold standard for treatment efficacy
Observational Studies
Can show associations, not causation
Case Reports & Expert Opinion
Hypothesis-generating only
Preclinical (Lab/Animal) Studies
Should NOT be extrapolated to humans
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Study Quality Indicators
Higher Quality Indicators
- Large sample size (hundreds to thousands)
- Randomized and blinded design
- Placebo-controlled comparison
- Published in peer-reviewed journals
- Replicated in multiple studies
- Registered trial protocol before starting
Lower Quality Indicators
- Small sample size (under 100)
- No control group or blinding
- Manufacturer-funded with conflicts
- Only animal/cell studies
- Never replicated
- Published in predatory journals
Important Limitations
- • Supplement research often has methodological limitations
- • Results from one study may not generalize to all people
- • Marketing claims often exceed what research supports
- • Absence of evidence is not evidence of absence
- • Individual response to supplements varies widely
Quick Answers
Can I get enough fisetin from food?
No. Dietary intake is 0.2–1.4 mg/day, while clinical trials use 1400+ mg — a 1000× difference.
Which fruit has the most fisetin?
Strawberries contain the highest concentration at approximately 160 μg/g fresh weight.
How many strawberries for a fisetin dose?
To match a clinical trial dose (~1400 mg), you would need to consume approximately 8.75 kg (19.3 lbs) of fresh strawberries.
Is fisetin in apple skin or flesh?
Fisetin is concentrated in apple skin (26.9 μg/g), with significantly lower levels in the flesh.
Does cooking destroy fisetin?
Cooking and processing may reduce fisetin content, though the degree of degradation varies by method and duration.
Are food sources of fisetin healthier?
Whole foods provide a complex matrix of nutrients and phytochemicals with synergistic benefits, but cannot deliver research-level fisetin doses.
Do I need fisetin supplements if I eat strawberries?
Dietary sources alone cannot replicate senolytic research doses. The decision to supplement should be made with a healthcare provider.
Is organic produce higher in fisetin?
Fisetin content varies by cultivar, growing conditions, ripeness, and storage — organic vs conventional differences have not been specifically studied.
Do frozen strawberries have fisetin?
Frozen strawberries retain fisetin, though some degradation may occur during processing and storage.
Can I juice for fisetin?
Juicing may extract fisetin, but the content depends on the fruit used and processing method.
What about fisetin in wine?
Grapes contain fisetin (3.9 μg/g), so wine may contain trace amounts, but significantly less than fresh strawberries.
Is fisetin in tea?
Fisetin has been detected in some teas, but at much lower concentrations than strawberries.
How much fisetin is in a persimmon?
Persimmons contain approximately 10.5 μg/g of fisetin.
Do dried strawberries have fisetin?
Dried strawberries concentrate fisetin by weight, but processing may cause some degradation.
Should I eat more strawberries for fisetin?
A balanced diet rich in fruits and vegetables is recommended regardless of supplementation decisions.
Key Research Facts
Strawberries contain approximately 160 μg/g of fisetin — the highest concentration of any commonly consumed food.
Strong EvidenceKhan et al., Antioxidants & Redox Signaling — doi:10.1089/ars.2012.4901
Typical dietary fisetin intake is 0.2–1.4 mg/day — approximately 1000× less than doses used in clinical senolytic research.
Strong EvidenceKhan et al., Antioxidants & Redox Signaling — doi:10.1089/ars.2012.4901
To match a single clinical trial dose (~1400 mg), one would need to consume approximately 8.75 kg (19.3 lbs) of fresh strawberries.
Strong EvidenceCalculated from Khan et al. — doi:10.1089/ars.2012.4901
Apples contain fisetin primarily in the skin (26.9 μg/g), with significantly lower levels in the flesh.
Moderate EvidenceNaeimi & Alizadeh, Trends in Food Science & Technology — doi:10.1016/j.tifs.2017.05.009
Epidemiological studies associate higher flavonoid intake (including fisetin-rich foods) with reduced cardiovascular risk, but fisetin's specific contribution cannot be isolated.
Moderate EvidenceGeneral nutritional epidemiology — Khan et al., 2013
Fisetin from food matrix may have different absorption characteristics than isolated supplemental fisetin due to interactions with fiber, other polyphenols, and macronutrients.
Moderate EvidenceFood matrix research — General food science
No controlled study has compared health outcomes between dietary fisetin and supplemental fisetin in human participants.
Strong EvidenceLiterature review — PubMed search, 2026
Other fisetin-containing foods include persimmons (10.5 μg/g), lotus root (5.8 μg/g), onions (4.8 μg/g), and grapes (3.9 μg/g).
Strong EvidenceKhan et al., Antioxidants & Redox Signaling — doi:10.1089/ars.2012.4901
Cooking and processing may reduce fisetin content in foods, though the degree of degradation varies by method and duration.
Moderate EvidenceFood science research — General food processing literature
A balanced diet rich in fruits and vegetables is recommended regardless of supplementation decisions, as benefits extend far beyond any single compound.
Strong EvidenceDietary guidelines — General nutrition guidance
Continue Your Research
Explore related topics and take the next step in your cellular health journey.
Citations & External Resources
ClinicalTrials.gov — Search: Fisetin
PubMed — Fisetin research
EBioMedicine — Yousefzadeh et al. 2018 (Landmark Senolytic Study)
NCT06133634 — Fisetin Vascular Function Trial
Antioxidants & Redox Signaling — Khan et al. 2013 (Comprehensive Review)
Trends in Food Science & Technology — Naeimi & Alizadeh 2017 (Food Sources)
USDA FoodData Central
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Related Reading
Fisetin: Overview, Evidence & Safety
Fisetin Bioavailability: Why Formulation Matters
Fisetin Dosage: Research Summary
References (3)
Written by
ReCellence™ Editorial Team
Health Content Specialists
Medically reviewed by
Medical Review Board
MD, PhD
Last updated: March 8, 2026
Last medical review: March 8, 2026