Longevity Dietary supplement

Quercetin

Quercetin Dihydrate

Evidence: Approved label. Example dose: finalize with a provider. Not a fact-check stamp.

500mg – 500-1000 mg Oral Daily

Quercetin is a polyphenolic flavonoid found abundantly in onions (especially red), capers, kale, apples, broccoli, berries, and tea. It is one of the most-consumed dietary flavonoids globally (typical Western intake 5-40mg/day from food) and one of the most-studied senolytic agents - compounds that selectively eliminate senescent ('zombie') cells that accumulate with age and contribute to age-related pathology. Pure Quercetin gained mainstream longevity attention through Mayo Clinic researcher James Kirkland's pioneering work pairing it with the cancer drug dasatinib in the 'D+Q' senolytic protocol.

Quick Start

Route

Oral

Start low

500mg Oral

Frequency

Daily

Timing

Anytime

Take with a fatty meal to improve absorption (quercetin is fat-soluble). Standard formulations (aglycone) have poor bioavailability - consider phytosome or EMIQ for better absorption. Senolytic D+Q protocol uses 1000mg pulse dosing (3 consecutive days) every 1-3 months, NOT chronic daily.

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Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.

Tiered Protocols · lowest first

Conservative start

500mg · Oral · Daily

conservative starter

500mg

Daily

Standard

Ionophore & Antihistamine

500-1000 mg · Oral · Daily

human clinical trial · Edwards et al. 2007 (J Nutr 137(11):2405-2411, PMID 17951477)

Poorly absorbed in raw form; look for phytosome or liposomal formulations. Stack with Zinc.

500-1000 mg

Daily

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How it works

Quercetin's senolytic mechanism involves inhibition of multiple anti-apoptotic 'SCAPs' (senescent cell anti-apoptotic pathway) proteins including BCL-XL, BCL-W, and PI3K/AKT signaling. Senescent cells upregulate these survival pathways to resist apoptosis; quercetin selectively destabilizes them, reactivating apoptosis preferentially in senescent vs healthy cells. The Kirkland lab D+Q protocol pairs quercetin (which targets BCL-XL/BCL-W and PI3K) with dasatinib (which targets ephrin-dependent senescent cell types) for broader senolytic coverage.

Beyond senolysis, quercetin acts as an AMPK activator (similar to other polyphenols like resveratrol), inducing mitochondrial biogenesis via PGC-1alpha and supporting cellular energy homeostasis. It inhibits NF-kB inflammatory signaling, reducing TNF-alpha, IL-6, and other pro-inflammatory cytokines. Mast cell stabilization occurs via inhibition of calcium influx and histamine granule release - quercetin is mechanistically similar to cromolyn sodium (a prescription mast cell stabilizer).

As a zinc ionophore, quercetin transports zinc across cell membranes into cells where intracellular zinc inhibits viral RNA polymerases (including SARS-CoV-2 RdRp). This mechanism underlies the immune/antiviral interest. Quercetin also has direct antioxidant capacity via its catechol structure, donating electrons to neutralize free radicals; the resulting quercetin radical is itself relatively stable. Cardiovascular effects involve eNOS activation (improving endothelial NO production), modest BP reduction in hypertensive subjects, and platelet aggregation modulation.

What to expect

Early

Days 1–7

Days 1-14: Allergy and inflammatory effects measurable.

Evidence

HumanPresent

AnimalPresent

In-vitroPresent

Each reference below was re-fetched from its PubMed record, and the quoted sentence was confirmed to appear in that abstract and to support the claim it sits under. Follow any of them to read the source.

Isolated quercetin is also marketed as a dietary supplement, mostly as the free quercetin aglycone, and frequently in daily doses of up to 1000 mg d-1 exceeding usual dietary intake levels.

Isolated quercetin is also marketed as a dietary supplement, mostly as the free quercetin aglycone, and frequently in daily doses of up to 1000 mg d-1 exceeding usual dietary intake levels.

Safety Aspects of the Use of Quercetin as a Dietary Supplement. Molecular nutrition & food research · 2018 · PMID 29127724

Evidence scope. Safety review of oral supplement use; includes the 500 mg amount but does not establish benefit or a specific formulation.

Claims we could not support

No abstract we checked supports these for this molecule at this route. That is not the same as saying they are false — it marks where the evidence is missing.

Complete regimen: 500mg via Oral, Daily. The verified row supports only the narrower dose/route boundary stated above, not every element of the displayed regimen.

Mechanism: Quercetin's senolytic mechanism involves inhibition of multiple anti-apoptotic 'SCAPs' (senescent cell anti-apoptotic pathway) proteins including BCL-XL, BCL-W, and PI3K/AKT signaling. Senescent cells upregulate these su. No checked live abstract supported this full mechanistic claim at the card's formulation/route without extrapolation.

Primary safety claim: Generally well tolerated at standard doses (500-1000mg/day). No checked live abstract directly established this as the primary concern for the card's exact formulation and regimen.

Interactions & stacking

Two different questions: what is documented about running these together, and what is documented about drawing them into the same syringe. A good pharmacological partner can still have to be pinned separately.

Documented together

CurcuminBoth polyphenols with anti-inflammatory effects through different mechanisms. Compatible no expected conflicts.

PterostilbenePolyphenol senolytic stack - both have AMPK activation and senolytic activity.

BromelainBromelain (pineapple enzyme) enhances quercetin absorption and adds anti-inflammatory effects via different mechanism. Common allergy stack.

Vitamin CVitamin C regenerates oxidized quercetin radical back to active form, sustaining antioxidant activity. Common pairing.

Keep separate

Anticoagulants (warfarin, apixaban, rivaroxaban)Quercetin has antiplatelet activity and CYP enzyme inhibition that can potentiate anticoagulants. Bleeding risk increase.

CyclosporineQuercetin inhibits CYP3A4 and P-glycoprotein, significantly raising cyclosporine levels - potentially dangerous interaction.

Quinolone AntibioticsQuercetin can reduce quinolone (ciprofloxacin, levofloxacin) effectiveness via DNA gyrase competition.

Surgery (within 2 weeks)Antiplatelet activity. Discontinue 2 weeks before scheduled surgery.

Check any specific pair in the Stack & Interaction Checker, which answers both questions separately. Absence of a documented conflict is not evidence of safety.

Pharmacokinetics

Illustrative plasma concentration · 3 d

Half-life

~11-28 hours

Highly variable, depends on form

Peak · Tmax

~1-3 hours

Oral

Elimination

~24-48 hours

Bioavailability

Low (~3-5%) for aglycone form; significantly improved (10-20x) for phytosome and EMIQ formulations.

Duration of action

Effects sustained with daily dosing for chronic uses (BP, inflammation). Senolytic effects from pulse dosing develop over 1-2 weeks post-pulse.

Clearance

Hepatic conjugation (sulfation, glucuronidation, methylation). Biliary and renal excretion of conjugates.

Storage. Store at room temperature (20-25C) in a cool, dry, dark place. Light and moisture-sensitive - keep in opaque containers. Capsules shelf-stable for 24+ months. Powder may oxidize and darken with prolonged exposure to air.

Regulatory status

Classified as a dietary supplement in the US (no FDA pre-approval). Available widely over the counter. EU permits quercetin as a food supplement. Generally Recognized as Safe at typical supplement doses. Dasatinib (the D+Q partner drug) is FDA-approved for chronic myeloid leukemia and ALL - prescription only.

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