How is this different then general quercetin?

Thorne's Quercetin Phytosome utilizes the advanced technology of phytosome complexes. Phytosome complexes are created by a patented process that binds a designated botanical extract to a phospholipid. Phospholipids are readily absorbed key components of cell membranes, and when complexed with a botanical, the phospholipid increases the absorbability of the botanical to which it is combined. In Thorne’s Quercetin Phytosome, quercetin is combined with plant-based phospholipids to create a phytosome complex that significantly enhances the absorption of the quercetin through the cell membrane, compared to quercetin by itself.

What is the standardized quercetin phytosome content of thorne quercetin phytosome from flower extract?

I emailed Thorne and this was their reply: It is approximately 40% quercetin, so the product contains approximately 100mg of quercetin. Quercetin phytosome demonstrates 20x absorption vs standard quercetin in clinical studies.

Is the L-leucine derived from corn? Is this product free of corn?

The leucine is derived from duck feathers, which are not pulled from the ducks but collected as they fall out. None of Thorne’s finished products contain corn, however, occasionally a product might contain an ingredient derived from corn. These are purified and considered non-allergenic. The quercetin in Thorne's Quercetin Phytosome supplement is derived from Saphora japonica, which is a plant. The phospholipid complex is derived from sunflower.

What Color is the powder suppose to be?

The powder in the capsules of Thorne’s Quercetin Phytosome can vary in color from pale yellow to orange, and can sometimes have a speckled or slightly mottled appearance.

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THORNE - Quercetin Phytosome - Antioxidant Supplement for Immune Health, Respiratory Support & Seasonal Allergy Relief* - Third-Party Certified - Gluten, Dairy & Soy-Free - 60 Capsules

THORNE - Quercetin Phytosome - Antioxidant Supplement for Immune Health, Respiratory Support & Seasonal Allergy Relief* - Third-Party Certified - Gluten, Dairy & Soy-Free - 60 Capsules

Product ID: 63589915

Details

Brand
THORNE
Diet Type
Gluten Free
Flavor
Unflavored
Item Form
Capsule
Primary Supplement Type
antioxidant

🌿Sophora japonica flavonoid power

🔬Third-party certified purity

🛡️20x bioavailability boost

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VT17987

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Details

Brand
THORNE
Diet Type
Gluten Free
Flavor
Unflavored

Description

🛡️ Elevate your immune game with nature’s most bioavailable antioxidant!

CLEAN PURE FORMULA - Gluten, dairy, soy-free with third-party certification ensuring label accuracy
IMMUNE ARMOR ALL YEAR - Supports balanced histamine release & respiratory health through seasonal shifts
PLANT POWERED POTENCY - Harnesses a 20x more absorbable quercetin phytosome from Sophora japonica flowers
OXIDATIVE STRESS SHIELD - Neutralizes free radicals to protect cells and slow aging
CLINICALLY TRUSTED BRAND - Chosen by 100+ pro sports teams & top healthcare practitioners in 2023

THORNE Quercetin Phytosome delivers a clinically trusted, third-party certified antioxidant supplement featuring a 20x more bioavailable plant flavonoid complex. Designed for year-round immune support, respiratory health, and seasonal allergy relief, it’s free from gluten, dairy, and soy—perfect for health-conscious professionals seeking clean, effective wellness solutions.

Specifications

ASIN	B0797DQTVZ
Age Range Description	Adult
Allergen Information	Dairy Free, Egg Free, Fish Free, Peanut Free, Shellfish Free, Soy Free, Tree Nut Free
Best Sellers Rank	#6,411 in Health & Household ( See Top 100 in Health & Household ) #22 in Polyphenol Antioxidant Supplements
Brand	THORNE
Brand Name	THORNE
Container Type	Bottle
Customer Reviews	4.7 out of 5 stars 2,337 Reviews
Diet Type	Gluten Free
Dosage Form	Capsule
Flavor	Unflavored
Item Dimensions	2.09 x 2.09 x 3.72 inches
Item Form	Capsule
Item Weight	0.13 Pounds
Manufacturer	Thorne Research
Manufacturer Part Number	SB335
Model Name	SB335
Model Number	SB335
Number of Items	1
Primary Supplement Type	antioxidant supplement
Product Benefits	Immune Support
Specific Uses For Product	Immune & Allergy Support
UPC	693749004356
Unit Count	60 Count

Reviews

K**R

23.03.2026

M**A

18.03.2026

B**Z

28.04.2026

S**Y

20.11.2025

B**E

9.02.2026

@**H

5.01.2026

G**P

2.02.2026

T**8

28.12.2025

J**Y

22.11.2025

J**Y

21.05.2025

A**!

27.08.2023

A**R

2.02.2022

P**Y

18.05.2024

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