Senolytics (Fisetin)
Clear senescent "zombie" cells that accumulate with age and drive inflammation and tissue dysfunction
Quick Answer
Senolytics are compounds that selectively kill senescent "zombie" cells, damaged cells that stop dividing but don't die and instead secrete inflammatory signals. Fisetin (a strawberry flavonoid) and D+Q (dasatinib + quercetin) are the most studied. Animal studies show extended healthspan and lifespan. Human trials are promising but limited. Use intermittently (1-3 days/month), not daily. Fisetin: 500-2000mg on dosing days.
Emerging
New research, promising but early
Safety: Fisetin appears safe but long-term human data is limited. D+Q requires medical supervision. Intermittent dosing only.
What Is This?
Senescent cells are sometimes called "zombie cells." When cells become damaged beyond repair, they should die. Instead, some enter a state called senescence, they stop dividing but don't die. These cells accumulate with age and secrete a toxic mix of inflammatory signals called SASP (senescence-associated secretory phenotype).
Senolytics are compounds that selectively kill these senescent cells. The term comes from "senescence" (cellular aging) and "lytic" (destroying).
Fisetin is a natural flavonoid found in strawberries, apples, and other fruits. It's the most potent natural senolytic discovered, extending both healthspan and lifespan in mice even when started late in life.
Dasatinib + Quercetin (D+Q) is the most clinically validated senolytic combination. Dasatinib is a prescription cancer drug; quercetin is a common flavonoid supplement. Together, they target different pathways that keep senescent cells alive.
The key insight: senolytics work through "hit-and-run" dosing. A brief exposure triggers irreversible cell death in senescent cells, so intermittent dosing (days, not daily) is both effective and safer.
How It Works
Why Senescent Cells Matter Senescent cells accumulate throughout the body with age. While they make up only a small percentage of total cells, they have outsized effects through the inflammatory signals they secrete. These signals:
- Drive chronic inflammation ("inflammaging")
- Damage surrounding healthy tissues
- Promote age-related diseases (heart disease, diabetes, neurodegeneration)
- Create a toxic microenvironment that spreads senescence to nearby cells
- Fisetin: Inhibits multiple survival pathways including PI3K/AKT and Bcl-2 family proteins
- Dasatinib: Tyrosine kinase inhibitor targeting survival signaling
- Quercetin: Inhibits Bcl-2 anti-apoptotic proteins
- Extended median lifespan by ~10% when started in old mice
- Improved tissue homeostasis and suppressed age-related pathology
- Reduced senescence markers and SASP factors
- Improved grip strength and physical function comparable to genetic senescent cell clearance
- 500mg daily for 1 week/month for 6 months
- 4/10 participants showed reduced biological age markers
- No adverse effects reported
- Improved physical function in idiopathic pulmonary fibrosis patients
- Reduced senescent cell markers in adipose tissue
- Pilot Alzheimer's trial (2025): 2 days every 2 weeks over 12 weeks showed cognitive benefits
How to Start
Choose your approach
Fisetin is OTC and well-tolerated. D+Q is more potent but dasatinib requires prescription and medical supervision. Most people start with fisetin.
Tips:
- •Fisetin: available as supplement, lower risk
- •D+Q: more clinical data but prescription needed
- •Do not take senolytics daily, intermittent only
Determine dosing schedule
Senolytics use "hit-and-run" intermittent dosing, typically 1-3 consecutive days per month. This is enough to trigger senescent cell death without constant exposure.
Tips:
- •Most common: 2 consecutive days per month
- •Some protocols: 3 days every 3 months
- •Daily use is NOT recommended and may be less effective
Start with a moderate fisetin dose
For fisetin, typical senolytic doses are 500-2000mg on dosing days. This is much higher than "maintenance" flavonoid doses. Start at the lower end.
Tips:
- •Senolytic dose: 500-2000mg (not the 100mg seen in some supplements)
- •Take with fat-containing food to improve absorption
- •Bioavailability is low, liposomal forms may help
Track and assess
Effects may not be immediately noticeable. Track energy, physical function, recovery, and any symptoms. Some report improved energy and reduced inflammation markers.
Tips:
- •Consider testing inflammatory markers (CRP, IL-6) before/after
- •Physical function improvements may take months to manifest
- •This is experimental, document your experience
What to Expect
Usually no immediate effects
Most people don't notice dramatic changes from the first dose. Senescent cell clearance is a gradual process. Some report mild fatigue during dosing days.
Subtle improvements possible
Some report improved energy, reduced joint stiffness, or better recovery from exercise. Effects are often subtle and may not be obvious without tracking.
Cumulative benefits
With continued intermittent use, senescent cell burden should decrease over time. Physical function, inflammatory markers, and tissue health may improve.
Healthspan extension (theoretical)
Based on animal studies, long-term senolytic use may extend healthspan and reduce age-related disease risk. Human long-term data is still being collected.
Dosing Information
Recommended Dose
Fisetin: 500-1000mg on dosing days; D+Q: 100mg dasatinib + 1250mg quercetin
Range
Fisetin: 500-2000mg; protocols vary from monthly to quarterly
- •INTERMITTENT dosing only, not daily
- •Common schedule: 2 consecutive days per month
- •Alternative: 3 days quarterly
- •Take with fat-containing meal for better absorption
- •D+Q requires prescription and medical supervision
Senolytics are experimental. D+Q should only be used under medical supervision. Do not take daily.
Practical Details
Timing
Take during your designated dosing days (e.g., 2 consecutive days per month). Take with a fat-containing meal to improve absorption. Fisetin has a short half-life, so timing within the day is flexible.
Duration
Used intermittently long-term for ongoing senescent cell clearance. Animal studies suggest benefits even when started late in life. Human long-term safety data is still being collected.
Cost
Fisetin: $30-60/month (for intermittent dosing); D+Q: varies (prescription + quercetin)
Fisetin cost depends on dose and quality. Higher doses needed for senolytic effect vs. general antioxidant use. Liposomal forms cost more. Dasatinib is expensive without insurance.
Risks & Considerations
Potential Risks
- •Limited long-term human safety data for senolytic doses
- •Fisetin has low bioavailability, actual tissue levels uncertain
- •D+Q: dasatinib has known side effects (fluid retention, GI issues, bleeding risk)
- •Theoretical concern: some senescent cells may have beneficial functions (wound healing, tumor suppression)
- •Interaction with medications metabolized by CYP enzymes
Possible Side Effects
- •Fisetin: Generally well-tolerated; no adverse effects reported in trials
- •Possible: mild fatigue during dosing days
- •D+Q: Fluid retention, nausea, diarrhea, fatigue (dasatinib side effects)
- •D+Q: Rare but serious: bleeding, fluid around heart/lungs
- •Unknown: long-term effects of repeated senolytic courses
Who Should Avoid This
- •D+Q: Active bleeding disorders or on blood thinners (dasatinib affects platelets)
- •D+Q: Liver or kidney disease
- •Pregnancy or breastfeeding
- •Active cancer treatment (consult oncologist, complex interactions)
- •Do not combine with grapefruit/grapefruit juice (affects dasatinib metabolism)
- •Taking other potentially senolytic compounds without medical guidance
Key Research
Fisetin is a Senotherapeutic that Extends Health and Lifespan
EBioMedicine, 2018
Fisetin reduced senescence markers in multiple tissues and extended median and maximum lifespan in mice even when treatment started late in life. First documentation of a senolytic extending both healthspan and lifespan.
View StudyIntermittent Fisetin Improves Physical Function in Aging Mice
Aging Cell, 2025
Intermittent fisetin supplementation attenuated age-related declines in physical function, with improvements comparable to genetic clearance of senescent cells. Favorable modulation of skeletal muscle transcriptome.
View StudyThe Effects of Fisetin on Reducing Biological Aging: A Pilot Study
Alternative Therapies in Health and Medicine, 2024
Fisetin 500mg daily for 1 week/month over 6 months. Mixed results: 4/10 showed reduced biological aging, 5/10 increased, 1/10 no change. Authors conclude more research needed before recommending as anti-aging agent.
View StudyD+Q Pilot Study for Alzheimer's Risk
eBioMedicine, 2025
D+Q (100mg dasatinib + 1250mg quercetin) for 2 days every 2 weeks over 12 weeks improved cognition and mobility in older adults at risk for Alzheimer's disease.
View StudyFrequently Asked Questions
Should I take fisetin or D+Q?
Fisetin is the easier starting point, it's OTC, well-tolerated, and shows promise in studies. D+Q has more clinical validation but requires a prescription for dasatinib and should be done under medical supervision. Most biohackers start with fisetin; those with access to medical guidance may consider D+Q.
Why can't I just take senolytics daily?
Intermittent dosing is a key feature of senolytic therapy. Senescent cells accumulate slowly, and senolytics trigger irreversible cell death with brief exposure (hours). Daily dosing isn't more effective and may increase side effects. The "hit-and-run" approach, a few days per month, matches how these compounds work.
Can I get enough fisetin from strawberries?
Not practically. Strawberries have the highest fisetin content (~160 µg/g), but you'd need roughly 130 strawberries to get 250mg of fisetin. Senolytic doses are typically 500-2000mg. Supplements are the only practical way to achieve senolytic doses.
How do I know if senolytics are working?
This is challenging because effects are often subtle. You might track: energy levels, joint stiffness, exercise recovery, inflammatory markers (CRP, IL-6), and biological age tests (epigenetic clocks). Don't expect dramatic overnight changes, benefits accumulate over months to years.
Are senolytics safe long-term?
We don't know yet. Fisetin appears safe in short-term studies with no adverse effects reported. D+Q uses a cancer drug with known side effects. Theoretical concerns exist about removing beneficial senescent cells. Human long-term data is limited. This is an emerging field, proceed with appropriate caution.
What about quercetin alone as a senolytic?
Quercetin alone is a weaker senolytic than fisetin or D+Q combination. In the D+Q protocol, quercetin works synergistically with dasatinib, each targets different survival pathways. High-dose quercetin (1000mg+) may have some senolytic effect, but the evidence is stronger for fisetin as a standalone natural senolytic.
Sources
Related Interventions
Disclaimer: This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider before starting any new health practice or supplement. Evidence levels and recommendations can change, this content was last updated December 2025.