Quercetin

01 What is Quercetin?

Quercetin is one of the most abundant flavonoids in the human diet — found in onions, apples, berries, and green tea. But the longevity community is interested in it for a very specific reason: when combined with dasatinib (a cancer drug), it forms one of the first proven senolytic combinations — a treatment that selectively kills senescent (zombie) cells. Senescent cells are damaged cells that refuse to die but also refuse to function properly. Instead, they pump out inflammatory signals (the SASP — senescence-associated secretory phenotype) that damage neighbouring healthy cells and drive aging. Clearing them is one of the most exciting frontiers in longevity science, and quercetin is half of the most-studied senolytic protocol. Even without dasatinib, quercetin has impressive standalone effects: potent anti-inflammatory, antioxidant, anti-allergic, and immune-modulating properties. It is one of those compounds where the floor (baseline supplement benefits) is solid and the ceiling (senolytic potential) is genuinely exciting.

02 How Does It Work?

As a senolytic: Quercetin inhibits PI3K, serpines, and several other pro-survival pathways that senescent cells depend on to avoid apoptosis. Senescent cells are uniquely vulnerable because they rely heavily on these anti-apoptotic pathways to survive despite their damaged state. Quercetin tips them over the edge into programmed cell death. Standalone: Quercetin inhibits mast cell degranulation (anti-allergic), scavenges reactive oxygen species, inhibits NF-kB and NLRP3 inflammasome (anti-inflammatory), and modulates multiple kinases involved in cellular stress responses.

03 What Does The Research Say?

The Dasatinib + Quercetin (D+Q) senolytic protocol has human clinical data. A 2019 Mayo Clinic trial in idiopathic pulmonary fibrosis patients showed reduced senescent cell markers after just 3 doses. A 2021 trial in diabetic kidney disease showed improved physical function and reduced senescent cell burden. Standalone quercetin research: meta-analyses show modest blood pressure reduction, improved endothelial function, reduced inflammatory markers, and anti-viral effects (gained attention during COVID for zinc ionophore properties). Bioavailability is the main challenge — standard quercetin is poorly absorbed. Phytosome or liposomal forms dramatically improve absorption.

04 Reported Dosages

Senolytic protocol (D+Q): Quercetin 1000mg + Dasatinib 100mg for 2-3 consecutive days, repeated monthly or quarterly. Dasatinib requires prescription. Standalone supplement: 500-1000mg daily. Quercetin phytosome: 250-500mg daily (better bioavailability). Some protocols combine with fisetin for enhanced senolytic effect without dasatinib. Legal supplement worldwide.

05 Side Effects & Risks

Very well-tolerated as a standalone supplement. Mild GI discomfort at high doses, rare headache. Can interact with some antibiotics (fluoroquinolones) and thyroid medications. The senolytic protocol (with dasatinib) has more significant potential side effects from the dasatinib component.

06 Legal Status

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