Spermidine vs Fisetin
Head-to-head comparison of Spermidine (Spermidine) and Fisetin (3,3',4',7-Tetrahydroxyflavone) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Spermidine | Fisetin |
|---|---|---|
| Category | Anti-Aging | Anti-Aging |
| Full Name | Spermidine | 3,3',4',7-Tetrahydroxyflavone |
| Molecular Weight | 145.25 Da | 286.24 Da |
| Half-Life | N/A | 3-8 hours |
| Amino Acids | N/A | N/A |
| Typical Dose | 1-6 mg/day | 1000-2000 mg/day |
| Route | Oral | Oral |
| Purity | ≥98% | ≥98% |
| Studies Count | 250 | 180 |
| Research Status | Clinical | Pre-clinical |
Spermidine Benefits
- ✓autophagy induction
- ✓mitochondrial quality control
- ✓cardiometabolic support
- ✓healthspan association
Fisetin Benefits
- ✓senolytic activity
- ✓reduces inflammatory signaling
- ✓supports mitochondrial function
- ✓may improve healthspan
Spermidine Dosing
1-6 mg/day oral|daily supplementation protocols|dietary intake from food sources
Fisetin Dosing
1000-2000 mg/day orally|1-2 days per month in senolytic-style studies|take with a fat-containing meal
Spermidine Side Effects
- ⚠GI upset
- ⚠bloating
- ⚠nausea
- ⚠odor changes
Fisetin Side Effects
- ⚠GI upset
- ⚠headache
- ⚠possible blood-thinner interaction
Research Overview
Spermidine
Spermidine has meaningful preclinical support and a growing human observational literature linking intake with healthier aging metrics. Its core longevity mechanism is thought to involve autophagy and improved proteostasis.
Fisetin
Preclinical studies show fisetin can selectively target senescent cells and reduce age-related inflammatory markers. Early human research exists, but definitive anti-aging outcomes in humans are still unproven.
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