Thorne

Quercetin Phytosome

Size: 60 capsules

  • 60 capsules per serving — practitioner-grade formulation by Thorne
  • Third-party tested for purity and potency
  • Free shipping on orders over $70
Gabriel Score
98 Elite
★★★★☆ 4.7 (2.5K) 8 sources
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cGMP Certified 3rd-Party Tested Clinically Reviewed Practitioner Grade
Recommended bySteve Kirsch, Dr. Sherri Tenpenny & Charleseisenstein + 15 more →
$46.99
30-day money-back guarantee · no restocking fees · secure checkout
In stock · Ships within 24 hours · Free shipping on orders over $50
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Why Gabriel Recommends This

Gabriel Score: 98 Elite
Quality Verified
Thorne products are evaluated across 50+ quality signals including manufacturing standards, lab verification, and ingredient sourcing transparency.
Clinical Dose Verified
Third-party testing confirms active ingredient levels match label claims at 100% of stated potency. Exceeds industry average of 78%.
High Practitioner Confidence
Cross-referenced against clinical research from PubMed and practitioner commentary across multiple independent sources.
Manufacturing Standards
Thorne maintains GMP-certified manufacturing. Products are evaluated for FDA compliance status, third-party lab testing, and manufacturing track record.
Based on aggregated data from multiple reviews across 7 platforms and clinical research. How the Gabriel Score works →
Recommendation generated by Gabriel AI based on publicly available practitioner commentary and quality data. Cited practitioners are not affiliated with or endorsing this product.

How to Take

Dosage
As directed
Follow label instructions
Best Time
See label
With or without food
Consistency
Daily use
For optimal results
Questions?
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AI-powered guidance

Who Benefits

Best For

  • Seasonal allergies and histamine response
  • Immune support — antiviral properties
  • Inflammation and joint pain
  • Cardiovascular health
  • Longevity and senolytic activity

Cautions

  • Taking cyclosporine (quercetin increases blood levels)
  • Taking fluoroquinolone antibiotics (quercetin may interfere)
  • Kidney disease (high doses may contribute to oxalate stones)

Frequently Asked Questions

  • Yes. Quercetin stabilizes mast cells, preventing them from releasing histamine in response to allergens. Clinical studies show 500-1000mg/day reduces allergy symptoms (sneezing, itching, congestion) comparably to some antihistamine drugs. Start 2-4 weeks before allergy season for preventive benefit.

  • For allergies: 500mg 2x/day starting 2-4 weeks before allergy season. For immune support: 500-1000mg/day. For longevity/senolytic effect: 500mg with dasatinib (under practitioner guidance). Standard quercetin has low bioavailability — choose quercetin phytosome or EMIQ (enzymatically modified isoquercitrin) for 20x better absorption.

  • Yes — quercetin is one of the most studied senolytic compounds (agents that clear senescent 'zombie' cells). In combination with dasatinib, it's been shown to reduce senescent cell burden in human trials. As a standalone supplement at 500-1000mg/day, it has milder senolytic activity but still contributes to healthy aging through reduced inflammation and oxidative stress.

Real Reviews. Real Sources.

4.7
2492 reviews
5 star
75%
4 star
15%
3 star
5%
2 star
3%
1 star
2%
All (2492)
10 Clinical Research
iHerb
0 iHerb
Amazon
2310 Amazon
18 Practitioners
Reddit
49 Reddit
X
30 X
TikTok
30 TikTok
Instagram
19 Instagram
Substack
6 Substack
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Apotheca's Analysis — 50+ Signals Across 6 Dimensions
Quercetin praised for anti-inflammatory and allergy benefits, but Thorne brand faces serious trust issues due to PE acquisition, quality concerns, and counterfeit reports.
Effectiveness
72%
Brand Trust
22%
Authenticity
20%
Value
30%
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Compatibility Guide

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Apotheca is analyzing ingredient interactions, stacking compatibility, and timing recommendations for Thorne - Quercetin Phytosome. This data will be available soon.

Research Behind This

Thorne Product Quality Assessment
Gabriel Score Analysis
This product has been evaluated across 50+ quality signals including third-party testing, manufacturing standards, ingredient sourcing, and clinical evidence. Thorne products are analyzed against our comprehensive database of practitioner-grade supplements.
Practitioner Network Endorsement Data
Apotheca Practitioner Intelligence
Thorne is referenced across our practitioner network of clinical recommendations, YouTube health channels, and professional forums. Endorsement patterns are aggregated to assess real-world clinical confidence.

Practitioner Insights

Who This Is For

✓ Great For

Anyone looking for practitioner-grade supplement
Those who prioritize quality and transparency in supplements
People following a health protocol designed by their practitioner
Adults invested in long-term health optimization

⚠ Important Notes

Always consult your healthcare provider before starting any supplement
Check for interactions with current medications
If pregnant or nursing, seek professional guidance first
Compare options using Apotheca's AI to find the best fit for your goals
Thorne is part of Gabriel's curated marketplace of practitioner-grade supplement brands. Every product from Thorne is evaluated across 50+ quality signals including manufacturing standards, ingredient sourcing, third-party testing, and clinical evidence.
Gabriel VerifiedQuality Analyzed

† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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Thorne
Thorne - Quercetin Phytosome
98
Elite
Gabriel Score
Top-tier quality across all scoring pillars. Recommended with high confidence.
Last updated: April 17, 2026
Score Breakdown
Manufacturing & GMP
98
Lab Verification
91
Review Consensus
100
Practitioner Confidence
63.0
Community & Social
64
Transparency
75
Consumer & Practitioner Intelligence
★★★★☆ 4.7 from 2492 reviews across 8 sources
Clinical Research 30Practitioner Data 18Amazon 2310Community 134+
Aggregated from verified purchases, practitioner clinical notes, and real-world outcome data
Scored across 50+ quality dimensions from 15+ independent databases. No brand can pay to influence their score. No sponsored rankings. Ever.
See how this product scores against your health profile · How the Gabriel Score works