Fisetin Dosage for Senolytic Activation: The 20 mg/kg Protocol Explained

Expert Summary

The 20 mg/kg fisetin dose is the most commonly referenced human extrapolation from the Yousefzadeh (2018) study. For a 70 kg adult, this equals approximately 1,400 mg of fisetin taken over 2 consecutive days. The protocol is repeated monthly or quarterly depending on individual goals and tolerance.

Key Facts

• Dose calculation: Multiply your body weight in kilograms by 20 to get your daily dose in milligrams. A 60 kg person takes ~1,200 mg/day; an 80 kg person takes ~1,600 mg/day.
• Duration: 2 consecutive days is the standard senolytic window, based on the timing required to trigger apoptosis in BCL-2-protected senescent cells. Extending to 3 days may improve clearance.
• Fat co-administration: Fisetin is lipophilic. Taking with olive oil, avocado, nuts, or full-fat dairy approximately doubles plasma peak concentration (Cmax) and area under the curve (AUC).
• Timing within day: Split the daily dose into 2–3 doses to maintain more consistent plasma levels. A typical pattern: 500 mg with breakfast (containing fat), 500 mg with lunch, 400 mg with dinner.
• Frequency: Monthly burst dosing maintains a lower senescent cell burden continuously. Quarterly dosing allows more complete cellular turnover between sessions. Both approaches lack direct human comparative data.
• Bioavailability adjustment: Standard fisetin extract requires higher doses to compensate for poor absorption. Phytosome or liposomal forms allow dose reduction to 250–500 mg total while potentially achieving equivalent or superior plasma exposure.

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Frequently Asked Questions

Can I take all 1,400 mg of fisetin at once?

Split dosing is preferred. Taking the full dose at once leads to a single plasma peak followed by rapid clearance (fisetin half-life: ~3 hours). Splitting into 2–3 doses throughout the day sustains therapeutic plasma levels longer.

What if I miss one of the two protocol days?

Continue with the remaining day. Missing one day is not catastrophic — partial senolysis still occurs. Make up the missed day within a reasonable window (within 48 hours) if possible.

Should I adjust the dose as I get older?

Senescent cell burden increases with age, but drug metabolism also slows. Most practitioners maintain the 20 mg/kg dose regardless of age, adjusting frequency (monthly vs quarterly) instead.

Scientific References

• Yousefzadeh MJ et al. Fisetin is a senotherapeutic that extends health and lifespan. EBioMedicine. 2018. PMID: 30279143
• Acknowledgement: Human dose extrapolation from mouse studies uses allometric scaling factors (Xu et al., Aging Cell 2021).