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Limited evidenceLongevity & antioxidants

Senolytic Formulas

Blends of fisetin and quercetin sold to clear "zombie" senescent cells. The concept comes from animal work and a few tiny human pilot studies that used a prescription cancer drug alongside quercetin, not the supplement versions.

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What the science says

  • Senescent cells can be reduced in humans Limited evidence

    An open-label pilot in 9 people with diabetic kidney disease found that 3 days of dasatinib plus quercetin lowered senescent-cell markers in fat and skin biopsies and reduced several circulating inflammatory factors. There was no placebo group, and the active partner was a prescription drug.

  • No proven benefit on aging or disease Limited evidence

    Reviews of the senolytic field describe the human work as early-phase: the trials so far are small pilot and phase 1/2 studies of drug combinations. No trial has shown that an over-the-counter fisetin or quercetin blend improves function, healthspan or any clinical outcome.

Dosage & safety

Studied doseMarketed blends usually supply 100–500 mg fisetin and 250–1000 mg quercetin, often "pulsed" for 2–3 consecutive days a month. That schedule is copied from drug trials; it has not been tested on its own.
SafetyQuercetin inhibits CYP3A4 and P-glycoprotein and can raise levels of many medications. High-dose fisetin is poorly absorbed and has no long-term human safety data. Avoid in pregnancy and breastfeeding, and do not combine with anticoagulants or cancer treatment without medical supervision.

How to take it

TimingMarketed blends are pulsed on 2–3 consecutive days a month rather than taken daily.
With food?With a fat-containing meal — both fisetin and quercetin absorb poorly without one.
Worth knowingThe pulsed schedule is copied from drug trials of dasatinib plus quercetin; the supplement version of it has never been tested on its own.

Interactions

With medications

  • drugs cleared by CYP3A4 or P-glycoprotein (statins, calcium channel blockers, ciclosporin, digoxin and many more)

    Quercetin inhibits both, raising blood levels of a wide range of medications. check every prescription with a pharmacist before starting

  • warfarin, DOACs and antiplatelet drugs

    Quercetin may add to bleeding risk on top of raising drug levels. do not combine without medical supervision

  • chemotherapy and targeted cancer treatment

    Interference with drug metabolism and unknown effects on treatment. do not use during cancer treatment without your oncologist's agreement

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Do senolytic supplements like fisetin and quercetin work?

No trial has shown that an over-the-counter fisetin or quercetin senolytic blend improves function, healthspan or any clinical outcome, so the evidence is limited. The human work so far is small pilot studies of prescription drug combinations.

Is there evidence senolytics clear senescent cells in humans?

An open-label pilot in 9 people with diabetic kidney disease found 3 days of dasatinib plus quercetin lowered senescent-cell markers. It had no placebo group and relied on dasatinib, a prescription cancer drug, not a supplement.

How do you dose a senolytic blend?

Marketed senolytic blends usually supply 100–500 mg fisetin and 250–1000 mg quercetin, pulsed on 2–3 consecutive days a month with a fat-containing meal. That schedule is copied from drug trials and has never been tested for the supplement version.

Is quercetin safe with my medications?

Quercetin in senolytic blends inhibits CYP3A4 and P-glycoprotein and can raise blood levels of statins, calcium channel blockers, ciclosporin, digoxin and many more, so check every prescription with a pharmacist. Do not combine it with blood thinners or cancer treatment without medical supervision.

Scientific references

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