Fisetin vs Spermidine
Side-by-side comparison of evidence grade, dosage, safety, and stacking compatibility.
Combined: Synergistic ✦— Excellent longevity stack. Spermidine daily; Fisetin pulse dosing 2 days per mon…
Senolytic / Polyphenol
Fisetin
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VS
Polyamine / Autophagy Inducer
Spermidine
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Overview
A flavonoid found in strawberries with the most potent senolytic activity among all tested compounds. Selectively eliminates senescent cells that accumulate with age and drive systemic inflammation — the SASP effect.
Summary
A naturally occurring polyamine found in high concentrations in wheat germ, aged cheese, and mushrooms. The most potent food-derived inducer of autophagy - the cellular self-cleaning process that removes damaged proteins and organelles. Spermidine levels decline 40-50% between ages 20 and 80, making supplementation a compelling longevity intervention.
Senolytic / Polyphenol
Category
Polyamine / Autophagy Inducer
B
Evidence Grade
A = strongest
B
Tier A — Proven
Safety Tier
A = safest
Tier A — Proven
Dosage
500 mg/day
Typical Dose
5 mg/day
100–1500 mg
Low / High
1–10 mg
Pulse dosing: 500–1500mg/day for 2 consecutive days, once per month. Take with a fat-containing meal.
Timing
Morning with breakfast, or with largest meal of the day. Consistent daily timing important for circadian alignment of autophagy cycles.
Pulse protocol: 2 consecutive days per month. Not for daily use.
Cycling
Continuous daily supplementation. Autophagy benefits require sustained elevation of spermidine levels.
Goals & Use Cases
longevitycellular-repairanti-inflammatory
Primary Goals
longevitycellular-repaircognitioncardiovascular
Shared goals:longevitycellular-repair
Safety Profile
- •Blood-thinning medications (fisetin inhibits platelet aggregation)
- •Pregnancy — insufficient safety data
Contraindications
fewer = safer
- No established absolute contraindications at dietary supplement doses•
- Active cancer - autophagy induction has complex effects on tumour biology•
Regulatory Status
✓ Legal
Legal (US)
✓ Legal
✓ Legal
Legal (EU)
✓ Legal
Can you take Fisetin and Spermidine together?
Synergistic ✦
Excellent longevity stack. Spermidine daily; Fisetin pulse dosing 2 days per month.
Spermidine induces autophagy (cellular recycling of damaged components). Fisetin selectively eliminates senescent cells that have escaped autophagy. Together they provide comprehensive cellular housekeeping - autophagy for reversible damage, senolysis for irreversibly damaged cells.
Compare with other compounds