Benefits
Respiratory Wellbeing in Sensitive/Intolerant Subjects
Two human studies showed Quercefit benefits for sensitive or intolerant subjects in respiratory area. Allergic respiratory and seasonal airway applications.
Allergic Rhinitis Adjunct
Quercetin has documented anti-histamine and mast cell stabilizing effects; Quercefit's bioavailable form delivers these effects more reliably.
Exercise Performance and Recovery
Some trials show quercetin (including Quercefit form) improves exercise capacity, reduces oxidative stress from exercise, supports recovery.
20× Bioavailability vs Standard Quercetin
Phytosome technology dramatically improves quercetin absorption — addresses standard quercetin's <2% bioavailability.
Anti-Inflammatory and Antioxidant
Quercetin is potent flavonoid antioxidant with documented anti-inflammatory effects; relevant to multiple conditions involving oxidative stress and inflammation.
Mast Cell Stabilization
Quercetin stabilizes mast cells (histamine-releasing cells) — mechanism for allergic and inflammatory applications.
Mechanism of action
Mast Cell Stabilization
Quercetin inhibits mast cell degranulation — reduces histamine and inflammatory mediator release. Mechanism for allergy and inflammatory applications. Similar to cromolyn pharmaceutical mechanism.
Histamine H1 Receptor Antagonism (Modest)
Modest H1 receptor antagonism — adds to mast cell stabilization for anti-allergic effects.
NF-κB Inhibition
Inhibits NF-κB inflammatory pathway — anti-inflammatory mechanism.
Phytosome® Bioavailability Enhancement
Standard quercetin has very low bioavailability (<2%); Phytosome® improves absorption by ~20× — addresses major limitation of quercetin supplementation.
Antioxidant / Free Radical Scavenging
Direct antioxidant activity; activation of NRF2 pathway for endogenous antioxidant defenses.
Clinical trials
Studies of Quercefit on respiratory wellbeing in sensitive/intolerant subjects.
Adults with respiratory sensitivity.
Improvements in respiratory comfort during seasonal challenges. Established Quercefit respiratory applications.
Multiple quercetin trials on exercise performance and recovery.
Athletes and active populations.
Modest improvements in exercise capacity, oxidative stress reduction, recovery markers.
About this ingredient
QUERCEFIT® is a QUERCETIN PHYTOSOME® formulation developed by INDENA (Italy) — using PHYTOSOME® technology applied to QUERCETIN. QUERCETIN BACKGROUND: a FLAVONOID widely found in plants — apples (especially skin), onions, capers, berries, kale, broccoli; one of most-studied flavonoid antioxidants. CHALLENGE: standard quercetin has VERY POOR ORAL BIOAVAILABILITY (<2%) — most ingested quercetin is not absorbed. Quercefit addresses this.
KEY DISTINCTIONS: (1) PHYTOSOME® TECHNOLOGY for enhanced bioavailability (~20× improvement); (2) Sourced from SOPHORA JAPONICA flowers; (3) HUMAN CLINICAL TRIALS for respiratory health and exercise; (4) Pharmaceutical-grade Indena quality.
EVIDENCE-BASED USES: (1) RESPIRATORY WELLBEING (sensitive/intolerant subjects); (2) Allergic rhinitis adjunct; (3) Exercise performance and recovery; (4) Anti-inflammatory; (5) Antioxidant support; (6) Mast cell stabilization.
CRITICAL CAUTIONS: (1) DOSE — 250-500 mg/day; (2) PREGNANCY — quercetin in food safe; concentrated supplementation limited safety data; AVOID high-dose; (3) CYCLOSPORINE — quercetin inhibits CYP3A4 increasing cyclosporine levels; relevant for transplant patients; consult; (4) ANTICOAGULANTS — modest interactions; (5) PRE-SURGERY — discontinue 1-2 weeks; (6) ALLERGIC RHINITIS APPLICATIONS — quercetin's mast cell stabilization mechanism is relevant; quercetin not replacement for antihistamines or nasal corticosteroids in moderate-severe rhinitis but reasonable adjunct; (7) DURATION — anti-allergic effects build over weeks; preventive use before allergy season ideal; (8) QUERCEFIT vs STANDARD QUERCETIN — the 20× bioavailability advantage is clinically meaningful; standard quercetin supplements often underperform; (9) FOR EXERCISE — modest performance effects; oxidative stress reduction more reliably documented; (10) DRUG-DRUG INTERACTIONS — quercetin's CYP3A4 inhibition relevant for many medications; consult prescriber; (11) BRAND VERIFICATION — Quercefit® and Phytosome® are Indena trademarks; clinical evidence specific to this technology; (12) For COMPREHENSIVE ALLERGY MANAGEMENT — antihistamines, nasal corticosteroids, environmental control, supplementation (Quercefit, vitamin C); integrative approach.