Thorne Quercetin Phytosome: Is Thorne Quercetin Phytosome safe for daily use?

Yes, Thorne Quercetin Phytosome is safe for daily use and is NSF Certified for Sport, the highest tier of third-party testing. Quercetin has been used in clinical trials for up to 12 weeks without significant adverse effects. Consult your doctor if you take medications, as quercetin may interact with certain drugs.

Thorne Quercetin Phytosome: Can I take Thorne Quercetin Phytosome with other supplements?

Yes, quercetin pairs well with vitamin C, zinc, and bromelain for enhanced immune and antioxidant support. The phytosome form already includes phospholipids for better absorption. Avoid taking it with certain antibiotics (fluoroquinolones) as quercetin may affect their absorption.

Thorne Quercetin Phytosome: Is Thorne Quercetin Phytosome safe for athletes?

Yes, it is NSF Certified for Sport, meaning it has been tested for over 270 banned substances and is safe for competitive athletes. Thorne is the official supplement partner of many professional sports teams and the US Olympic team.

Thorne Quercetin Phytosome: Are there side effects from quercetin phytosome?

Quercetin phytosome is generally well-tolerated. Rare side effects include mild headache or stomach upset. The phytosome delivery may reduce GI-related side effects compared to standard quercetin, as it requires a lower total dose for equivalent blood levels.

Thorne Quercetin Phytosome: Can Thorne Quercetin Phytosome be taken during pregnancy?

There is insufficient safety data on quercetin supplementation during pregnancy or breastfeeding. While quercetin is naturally present in foods like onions and apples, concentrated supplemental doses have not been studied in pregnant women. Consult your obstetrician before use.

Thorne Quercetin Phytosome: What is the recommended dose of Thorne Quercetin Phytosome?

The recommended dose is 1 capsule (250mg quercetin phytosome) once or twice daily. Due to the 20x improved absorption of phytosome technology, 250mg provides more bioavailable quercetin than 1,000mg of standard quercetin dihydrate.

Thorne Quercetin Phytosome: Should I take Thorne Quercetin with food?

While the phytosome form already contains built-in phospholipids for absorption, taking it with a fat-containing meal can further enhance uptake. Quercetin is a lipophilic compound, so healthy fats like olive oil, avocado, or nuts help with absorption.

Thorne Quercetin Phytosome: Can I take 2 capsules per day of Thorne Quercetin?

Yes, taking 2 capsules (500mg phytosome) daily is within the typical dosing range and has been used in clinical studies. This provides even higher bioavailable quercetin levels. Start with 1 capsule and increase if desired.

Thorne Quercetin Phytosome: How long should I take Thorne Quercetin Phytosome?

Quercetin can be taken as a long-term daily supplement. Clinical trials have studied continuous use for up to 12 weeks. Many people use it seasonally for immune support or year-round for antioxidant and anti-inflammatory benefits.

Thorne Quercetin Phytosome: When is the best time to take quercetin phytosome?

There is no strict best time, but taking it with your largest meal (typically lunch or dinner) maximizes absorption due to the fat content. For immune support during cold season, consistent daily timing helps maintain steady quercetin levels in the body.

Thorne Quercetin Phytosome: What is Quercefit technology in Thorne Quercetin?

Quercefit is a patented quercetin phytosome technology by Indena that wraps quercetin in a sunflower phospholipid shell. This dramatically improves absorption, achieving up to 20x higher plasma levels than standard quercetin dihydrate in pharmacokinetic studies.

Thorne Quercetin Phytosome: How is Thorne Quercetin Phytosome different from regular quercetin?

Standard quercetin has only ~2% oral bioavailability, meaning 98% passes through unabsorbed. Thorne uses Quercefit phytosome technology to wrap quercetin in phospholipids, boosting absorption up to 20x. This means 250mg of phytosome delivers more usable quercetin than 1,000mg of standard form.

Thorne Quercetin Phytosome: Does Thorne Quercetin contain any fillers or additives?

Thorne is known for clean formulations with minimal excipients. The capsule contains quercetin phytosome (Quercefit), hypromellose (capsule shell), and leucine. There are no artificial colors, flavors, preservatives, or common allergens.

Thorne Quercetin Phytosome: Is there soy in Thorne Quercetin Phytosome?

No, Thorne Quercetin Phytosome is soy-free. The phospholipid used in the Quercefit phytosome is derived from sunflower lecithin, not soy. This makes it suitable for people with soy allergies or those avoiding soy-based ingredients.

Thorne Quercetin Phytosome: Does Thorne Quercetin contain vitamin C or zinc?

No, Thorne Quercetin Phytosome is a single-ingredient formula containing only quercetin phytosome. If you want to combine quercetin with vitamin C or zinc for immune support, you would need to take those separately. Thorne offers standalone vitamin C and zinc products.

Thorne Quercetin Phytosome: How effective is Thorne Quercetin for inflammation?

Quercetin is one of the most studied anti-inflammatory flavonoids, and the phytosome form ensures meaningful absorption. Clinical studies show quercetin can modulate NF-kB inflammatory signaling, stabilize mast cells, and reduce inflammatory cytokines. The 20x absorption advantage makes this among the most effective quercetin supplements available.

Thorne Quercetin Phytosome: Does Thorne Quercetin help with allergies?

Quercetin is a natural mast cell stabilizer, which means it can help reduce histamine release associated with allergic reactions. The enhanced absorption of the phytosome form makes it particularly effective for allergy support. Many users report reduced seasonal allergy symptoms with consistent use.

Thorne Quercetin Phytosome: Can Thorne Quercetin boost immune function?

Yes, quercetin supports immune function through multiple mechanisms including antiviral activity, mast cell stabilization, and modulation of inflammatory cytokines. The phytosome delivery ensures quercetin reaches immune cells at meaningful concentrations. It works synergistically with vitamin C and zinc.

Thorne Quercetin Phytosome: How quickly does Thorne Quercetin Phytosome work?

The phytosome form achieves peak blood levels faster than standard quercetin. Anti-inflammatory and antihistamine effects may be noticed within a few days to two weeks of consistent use. Immune-supporting benefits build over time with daily supplementation.

Thorne Quercetin Phytosome: How big are Thorne Quercetin capsules?

Thorne Quercetin Phytosome capsules are standard-sized vegetarian capsules that are easy to swallow. The 250mg dose keeps the capsule relatively small compared to products requiring 500-1,000mg of standard quercetin per serving.

Thorne Quercetin Phytosome: How many capsules are in a bottle of Thorne Quercetin?

Each bottle contains 60 capsules, providing a 30-60 day supply depending on whether you take 1 or 2 capsules daily. The bottle is compact and travel-friendly.

Thorne Quercetin Phytosome: How should I store Thorne Quercetin Phytosome?

Store at room temperature in a cool, dry place away from direct sunlight. Keep the bottle tightly sealed. No refrigeration is needed. The product is stable at room temperature for the duration of its shelf life.

Thorne Quercetin Phytosome: Is Thorne Quercetin Phytosome gluten-free?

Yes, Thorne Quercetin Phytosome is gluten-free, soy-free, and dairy-free. It is suitable for people with celiac disease or gluten sensitivity. Thorne products are manufactured in a facility with strict allergen controls.

Thorne Quercetin Phytosome: Is Thorne Quercetin vegan?

Yes, the capsule shell is made from hypromellose (plant-derived cellulose), making the entire product vegan-friendly. The phospholipids in the Quercefit phytosome are derived from sunflower, not animal sources.

Thorne Quercetin Phytosome: Can I take Thorne Quercetin if I have food allergies?

Thorne Quercetin Phytosome is free from gluten, soy, dairy, eggs, fish, shellfish, tree nuts, and peanuts. The sunflower-derived phospholipid is safe for most allergy sufferers. However, if you have a rare sunflower allergy, consult your allergist before use.

NOW Foods Quercetin with Bromelain: Is NOW Foods Quercetin with Bromelain safe?

Yes, NOW Foods Quercetin with Bromelain has an excellent safety profile and is GMP-certified. Quercetin and bromelain are both well-studied compounds with long histories of safe use. Consult your doctor if you take blood thinners, as bromelain has mild anticoagulant properties.

NOW Foods Quercetin with Bromelain: Can NOW Quercetin cause stomach upset?

Some people experience mild stomach discomfort from quercetin supplements. Taking it with food typically reduces this. The bromelain in this formula may actually help with digestion, as it is a proteolytic enzyme derived from pineapple.

NOW Foods Quercetin with Bromelain: Is NOW Quercetin safe with blood thinners?

Use caution when combining quercetin with bromelain and blood-thinning medications. Both quercetin and bromelain have mild antiplatelet properties that could theoretically increase bleeding risk. Consult your doctor before combining this supplement with warfarin, aspirin, or other anticoagulants.

NOW Foods Quercetin with Bromelain: Can I take NOW Quercetin with Bromelain long-term?

Yes, quercetin has been studied for up to 12 weeks in clinical trials without significant adverse effects, and bromelain has a long history of safe use. Many people take this combination year-round for anti-inflammatory and immune support.

NOW Foods Quercetin with Bromelain: Is NOW Quercetin with Bromelain third-party tested?

NOW Foods manufactures in GMP-certified facilities and conducts in-house testing. However, it does not carry NSF or USP third-party certification. NOW is a reputable 50+ year brand with strong quality control practices.

NOW Foods Quercetin with Bromelain: What is the recommended dosage for NOW Quercetin with Bromelain?

The recommended dose is 2 capsules daily, providing 800mg quercetin and 200mg bromelain. You can take both capsules at once or split them between meals. Taking with food improves quercetin absorption and reduces potential stomach discomfort.

NOW Foods Quercetin with Bromelain: Should I take NOW Quercetin with food or on an empty stomach?

Take with a fat-containing meal for best quercetin absorption. Quercetin is lipophilic and absorbs better with dietary fats. The bromelain component is sometimes taken on an empty stomach for systemic anti-inflammatory effects, but the combined formula is best taken with food.

NOW Foods Quercetin with Bromelain: Can I take just 1 capsule per day instead of 2?

Yes, 1 capsule provides 400mg quercetin and 100mg bromelain, which is still a meaningful dose. For budget-conscious users or those new to quercetin, starting with 1 capsule is a reasonable approach. The 90-capsule bottle lasts 90 days at 1 capsule per day.

NOW Foods Quercetin with Bromelain: How long does a bottle of NOW Quercetin with Bromelain last?

The bottle contains 90 vegetarian capsules. At the recommended 2-capsule serving, it lasts 45 days. At 1 capsule per day, it lasts 90 days. This makes it an excellent value at $0.24 per 2-capsule serving.

NOW Foods Quercetin with Bromelain: Can I take NOW Quercetin with vitamin C?

Yes, quercetin and vitamin C are synergistic. Vitamin C regenerates oxidized quercetin and provides additional antioxidant and immune support. Many people take this quercetin-bromelain formula alongside a vitamin C supplement for comprehensive immune defense.

NOW Foods Quercetin with Bromelain: What type of quercetin is in NOW Foods formula?

NOW Foods uses quercetin dihydrate, the standard crystalline form of quercetin. While it has lower bioavailability than phytosome forms, the addition of bromelain helps enhance absorption. The 400mg dose per capsule is at the higher end for standard quercetin.

NOW Foods Quercetin with Bromelain: What is bromelain and why is it added?

Bromelain is a proteolytic enzyme derived from pineapple stems. It enhances quercetin absorption and provides its own anti-inflammatory benefits by breaking down proteins involved in inflammation. The combination offers dual anti-inflammatory action from two different mechanisms.

NOW Foods Quercetin with Bromelain: Does NOW Quercetin contain any artificial ingredients?

No, this formula contains quercetin dihydrate, bromelain, and minimal excipients in a vegetarian cellulose capsule. NOW Foods is known for clean formulations without artificial colors, flavors, or preservatives.

NOW Foods Quercetin with Bromelain: Is the quercetin in NOW Foods plant-derived?

Yes, quercetin is a naturally occurring flavonoid found in plants like onions, apples, and berries. The supplemental quercetin dihydrate used by NOW Foods is derived from plant sources and is identical to the quercetin found in food.

NOW Foods Quercetin with Bromelain: How does the bromelain dose compare to standalone bromelain products?

Each capsule provides 100mg of bromelain (200mg per 2-capsule serving). Standalone bromelain supplements typically provide 500-2,000 GDU. The bromelain here is dosed primarily as a quercetin absorption enhancer, though it still provides meaningful anti-inflammatory activity.

NOW Foods Quercetin with Bromelain: How effective is NOW Quercetin for allergy relief?

Quercetin is a natural mast cell stabilizer that can reduce histamine release. Many users report improvement in seasonal allergy symptoms with consistent use. The bromelain adds anti-inflammatory support that may further reduce allergy-related sinus congestion and swelling.

NOW Foods Quercetin with Bromelain: Does NOW Quercetin with Bromelain reduce inflammation?

Yes, both quercetin and bromelain have well-documented anti-inflammatory properties. Quercetin inhibits NF-kB inflammatory signaling, while bromelain breaks down inflammatory proteins. The combination provides a two-pronged approach to reducing systemic inflammation.

NOW Foods Quercetin with Bromelain: How long does it take for quercetin with bromelain to work?

Anti-inflammatory effects may be noticed within 1-2 weeks of consistent daily use. Allergy-related benefits like reduced histamine response can take 2-4 weeks to become apparent. Immune support builds gradually with daily supplementation over several weeks.

NOW Foods Quercetin with Bromelain: Is NOW Quercetin as effective as Thorne Quercetin Phytosome?

Thorne Quercetin Phytosome achieves up to 20x better absorption, making it more bioavailable per milligram. However, NOW Quercetin with Bromelain costs significantly less and the bromelain provides its own anti-inflammatory benefits. For budget-conscious users, NOW offers excellent value despite lower per-milligram absorption.

NOW Foods Quercetin with Bromelain: How big are NOW Quercetin with Bromelain capsules?

The capsules are standard vegetarian capsule size, slightly larger than a typical vitamin pill due to the combined 500mg ingredient load per capsule. Most adults find them easy to swallow with water.

NOW Foods Quercetin with Bromelain: How should I store NOW Quercetin with Bromelain?

Store in a cool, dry place away from direct sunlight. Keep the bottle tightly sealed. Bromelain is an enzyme that can degrade with excessive heat or moisture, so avoid storing in bathrooms or kitchens near heat sources.

NOW Foods Quercetin with Bromelain: What color are the capsules?

The capsules are clear vegetarian cellulose capsules containing yellowish-brown quercetin powder. The natural color comes from quercetin, which is a yellow pigment. This is normal and indicates the presence of the active ingredient.

NOW Foods Quercetin with Bromelain: Is NOW Quercetin with Bromelain vegan?

Yes, this product uses vegan-friendly ingredients including a plant-derived cellulose capsule. Both quercetin (plant flavonoid) and bromelain (pineapple enzyme) are plant-sourced. It is also Non-GMO and gluten-free.

Best Quercetin Supplements (2026)

· Updated April 2026

Lab Tested, Evidence Ranked

Supplement Science Editorial Team·Evidence-Based Supplement Research

Published Mar 10, 2026·Reviewed Apr 24, 2026

2,500+Clinical Studies Cited

7Quercetin products evaluated

This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Our Verdict

The best quercetin supplement uses phytosome technology for up to 20x better absorption, delivering meaningful anti-inflammatory and immune benefits at a lower effective dose.

Best By Category

#1Overall (Best Absorption)

Thorne Quercetin Phytosome

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#2With Bromelain

NOW Foods Quercetin with Bromelain

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#4Immune Support

Life Extension Bio-Quercetin

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#6Budget

Jarrow Formulas Quercetin 500mg

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#3High Dose

Pure Encapsulations Quercetin

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The best quercetin supplement uses phytosome technology (Quercefit or similar), which improves absorption up to 20×...

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We analyzed 35+ quercetin supplements across form (phytosome vs standard vs bromelain-enhanced), dose, absorption technology, third-party testing, and value. Standard quercetin has notoriously poor bioavailability — only ~2% is absorbed — making the delivery system the single most important factor in choosing a product.

As an Amazon Associate, we earn from qualifying purchases. Some links below are affiliate links — this doesn't affect our editorial independence or product ratings. How we evaluate products

How We Chose These Products

Products are ranked using our published scoring methodology — evidence strength, dose adequacy, ingredient form, third-party testing signals, value, and clean-label factors are weighted across the 5 criteria below. Commercial relationships do not determine our editorial rankings.

Bioavailability

35%

Standard quercetin absorbs poorly (~2%). Phytosome forms achieve up to 20x higher plasma levels. We heavily weight delivery technology because unabsorbed quercetin provides no benefit.

Dose Adequacy

25%

Does the product provide a clinically relevant dose (500-1000mg standard or 250-500mg phytosome)?

Third-Party Testing

20%

Independent verification of identity, potency, and purity. Especially important for botanical extracts.

Value

10%

Cost per absorbed dose — a cheaper standard quercetin may actually be worse value than a pricier phytosome.

Synergistic Ingredients

10%

Bonus for evidence-based additions like bromelain, vitamin C, or zinc that enhance quercetin's effects.

#1 Top Pick

Thorne Quercetin Phytosome

THORNE

2,325 Amazon reviews

9.4/10

4.7

Thorne uses Quercefit, the patented quercetin phytosome by Indena, which delivers up to 20x higher plasma levels than standard quercetin. At 250mg phytosome, this provides more bioavailable quercetin than 1000mg of standard quercetin dihydrate. NSF Certified for Sport is the highest tier of third-party testing. Thorne is trusted by professional athletes and healthcare practitioners.

IngredientQuercetin Phytosome (Quercefit)

Dose250mg quercetin phytosome per capsule

FormCapsule

TestingNSF Certified for Sport

250mg quercetin phytosome per capsuleClinical range: 500-1000mg daily

Below clinical dose

$0.77/serving$46.00 · 60 Capsules

Pros

20x absorption vs standard quercetin
NSF Certified for Sport
Patented Quercefit technology

Cons

Premium price ($0.52/serving)
250mg label dose (despite superior absorption)

Gluten-freeSoy-freeDairy-free

Buy Nowon Amazon

Read full review →

Quick Comparison

#1Thorne Quercetin Phytosome

9.4/10

THORNE

#1 Top Pick

2,325 Amazon reviews

Best for: Overall — best absorption via phytosome technology with NSF certification

Quercetin Phytosome (Quercefit) · 250mg quercetin phytosome per capsule

Capsule · NSFNSF Certified for Sport

$46.00

$0.77/serving

Buy Nowon Amazon

#2NOW Foods Quercetin with Bromelain

8.5/10

NOW Foods

10,377 Amazon reviews

Best for: Anti-inflammatory — quercetin plus bromelain for double anti-inflammatory action

Quercetin Dihydrate + Bromelain · 400mg quercetin + 100mg bromelain

Capsule · GMP Certified

$7.99

$0.07/serving

Buy Nowon Amazon

#3Pure Encapsulations Quercetin

8.3/10

Pure Encapsulations

3,032 Amazon reviews

Best for: High dose — hypoallergenic formula for sensitive individuals

Quercetin Dihydrate · 500mg quercetin per serving (2 capsules)

Capsule · Third-Party Tested

$50.50

$0.84/serving

Buy Nowon Amazon

#4Life Extension Bio-Quercetin

8.2/10

Life Extension

1,703 Amazon reviews

Best for: Immune support — quercetin plus fucoidan for enhanced immune modulation

Quercetin + Optimized Fucoidan · 150mg bio-enhanced quercetin

Capsule · Third-Party Tested

$9.00

$0.15/serving

Buy Nowon Amazon

#5Sunergetic Quercetin Bromelain 1000mg

8/10

Sunergetic

806 Amazon reviews

Best for: Users seeking a high-dose quercetin + bromelain combination for immune support and seasonal respiratory wellness

Quercetin 1000mg + Bromelain · 1,000mg quercetin per 2-capsule serving; 30 servings per bottle

Capsule · GMP manufactured; third-party testing not publicly disclosed

$17.95

$0.60/serving

Buy Nowon Amazon

#6Jarrow Formulas Quercetin 500mg

7.9/10

Jarrow Formulas

Staff Pick

4,088 Amazon reviews

Best for: Budget — straightforward 500mg quercetin at the lowest price

Quercetin Dihydrate · 500mg quercetin

Capsule · GMP Certified

$49.99

$0.25/serving

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#7Integrative Therapeutics Alpha-Glycosyl Isoquercitrin

7.7/10

Integrative Therapeutics

359 Amazon reviews

Best for: Adults seeking a highly bioavailable quercetin form for antioxidant pathway support and cellular integrity, particularly those who have had poor absorption with standard quercetin supplements

Alpha-Glycosyl Isoquercitrin (bioavailable quercetin) · 1 capsule daily (60 capsules, 60 servings)

Capsule · GMP Certified

$34.50

$0.57/serving

Buy Nowon Amazon

#	Product	Best For	Ingredient & Dose	Form & Testing	Price	Rating
1	Thorne Quercetin Phytosome #1 Top Pick 2,325 Amazon reviews	Overall — best absorption via phytosome technology with NSF certification	Quercetin Phytosome (Quercefit) 250mg quercetin phytosome per capsule	Capsule 60 Capsules NSFNSF Certified for Sport	$46.00 $0.77/serving	9.4/10	Buy Nowon Amazon
2	NOW Foods Quercetin with Bromelain 10,377 Amazon reviews	Anti-inflammatory — quercetin plus bromelain for double anti-inflammatory action	Quercetin Dihydrate + Bromelain 400mg quercetin + 100mg bromelain	Capsule GMP Certified	$7.99 $0.07/serving	8.5/10	Buy Nowon Amazon
3	Pure Encapsulations Quercetin 3,032 Amazon reviews	High dose — hypoallergenic formula for sensitive individuals	Quercetin Dihydrate 500mg quercetin per serving (2 capsules)	Capsule 120 Capsules Third-Party Tested	$50.50 $0.84/serving	8.3/10	Buy Nowon Amazon
4	Life Extension Bio-Quercetin 1,703 Amazon reviews	Immune support — quercetin plus fucoidan for enhanced immune modulation	Quercetin + Optimized Fucoidan 150mg bio-enhanced quercetin	Capsule 30 Capsules Third-Party Tested	$9.00 $0.15/serving	8.2/10	Buy Nowon Amazon
5	Sunergetic Quercetin Bromelain 1000mg 806 Amazon reviews	Users seeking a high-dose quercetin + bromelain combination for immune support and seasonal respiratory wellness	Quercetin 1000mg + Bromelain 1,000mg quercetin per 2-capsule serving; 30 servings per bottle	Capsule 60 Count GMP manufactured; third-party testing not publicly disclosed	$17.95 $0.60/serving	8/10	Buy Nowon Amazon
6	Jarrow Formulas Quercetin 500mg Staff Pick 4,088 Amazon reviews	Budget — straightforward 500mg quercetin at the lowest price	Quercetin Dihydrate 500mg quercetin	Capsule 200 Servings GMP Certified	$49.99 $0.25/serving	7.9/10	Buy Nowon Amazon
7	Integrative Therapeutics Alpha-Glycosyl Isoquercitrin 359 Amazon reviews	Adults seeking a highly bioavailable quercetin form for antioxidant pathway support and cellular integrity, particularly those who have had poor absorption with standard quercetin supplements	Alpha-Glycosyl Isoquercitrin (bioavailable quercetin) 1 capsule daily (60 capsules, 60 servings)	Capsule 60 Count GMP Certified	$34.50 $0.57/serving	7.7/10	Buy Nowon Amazon

Detailed Reviews

#1 Top Pick

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

THORNE

2,325 Amazon reviews

9.4/10

(2,325)

Gluten-freeSoy-freeDairy-free

IngredientQuercetin Phytosome (Quercefit)

Dose250mg quercetin phytosome per capsule

FormCapsule

TestingNSF Certified for Sport

250mg quercetin phytosome per capsuleClinical range: 500-1000mg daily

Below clinical dose

$0.77/serving$46.00 · 60 Capsules

Ideal for: Overall — best absorption via phytosome technology with NSF certification

Not ideal for: Budget shoppers confused by lower milligram label dose

Pros

20x absorption vs standard quercetin
NSF Certified for Sport
Patented Quercefit technology
Trusted by healthcare practitioners

Cons

Premium price ($0.52/serving)
250mg label dose (despite superior absorption)
Only 60 capsules per bottle

Buy Nowon Amazon

Read full Quercetin Phytosome (Quercefit)guide →

NOW Supplements, Ashwagandha (Withania somnifera) 450 mg (Standardized Extract), 90 Veg Capsules

NOW Foods

10,377 Amazon reviews

8.5/10

(10,377)

VeganGluten-freeNon-GMO

The classic quercetin + bromelain pairing at an excellent price. Bromelain (pineapple enzyme) both enhances quercetin absorption and provides its own anti-inflammatory and proteolytic activity. NOW Foods is a 50+ year brand with GMP-certified manufacturing. At $0.24/serving, it is one of the most affordable quality options.

IngredientQuercetin Dihydrate + Bromelain

Dose400mg quercetin + 100mg bromelain

FormCapsule

TestingGMP Certified

400mg quercetin + 100mg bromelainClinical range: 500-1000mg daily

Partial dose

$0.07/serving

Ideal for: Anti-inflammatory — quercetin plus bromelain for double anti-inflammatory action

Not ideal for: Those requiring NSF/USP-level testing or a full 500mg dose

Pros

Excellent value at $0.24/serving
Bromelain enhances absorption
Dual anti-inflammatory action
Established 50+ year brand

Cons

Only GMP certified
Standard quercetin form
400mg dose (slightly below 500mg clinical standard)

Buy Nowon Amazon

Read full Quercetin Dihydrate + Bromelainguide →

Pure Encapsulations Quercetin — view 1 of 5

Pure Encapsulations Quercetin - 500 mg - Immune Support, Cellular Health & Heart Health - Antioxidant Supplement - Gluten Free & Non-GMO - 120 Capsules

#1 Best Sellerin Bioflavonoid Antioxidant Supplements

Pure Encapsulations

3,032 Amazon reviews

8.3/10

(3,032)

HypoallergenicGluten-freeNon-GMOVegan

Pure Encapsulations is known for hypoallergenic formulas free from wheat, eggs, tree nuts, peanuts, gluten, artificial sweeteners, and hydrogenated fats. Third-party tested. Ideal for individuals with multiple sensitivities who need a clean quercetin source.

IngredientQuercetin Dihydrate

Dose500mg quercetin per serving (2 capsules)

FormCapsule

TestingThird-Party Tested

500mg quercetin per serving (2 capsules)Clinical range: 500-1000mg daily

Therapeutic dose

$0.84/serving$50.50 · 120 Capsules

Ideal for: High dose — hypoallergenic formula for sensitive individuals

Not ideal for: Budget buyers or those wanting absorption-enhancing synergistic ingredients

Pros

Hypoallergenic formula
Third-party tested
Full 500mg dose
Trusted by practitioners

Cons

Requires 2 capsules
No absorption enhancers
Premium pricing at $0.40/serving
Standard quercetin form

Buy Nowon Amazon

Read full Quercetin Dihydrateguide →

Life Extension Bio-Quercetin, Immune Health Supplement, Heart Health Support, Gluten Free, Non-GMO, Vegetarian, 30 Capsules

Life Extension

1,703 Amazon reviews

8.2/10

(1,703)

Non-GMOGluten-free

Life Extension's formulation pairs quercetin with fucoidan (a seaweed-derived polysaccharide) for enhanced immune support. The bio-enhanced form claims improved absorption. Life Extension is known for science-first formulation and third-party testing. Most affordable option on the list.

IngredientQuercetin + Optimized Fucoidan

Dose150mg bio-enhanced quercetin

FormCapsule

TestingThird-Party Tested

150mg bio-enhanced quercetinClinical range: 500-1000mg daily

Below clinical dose

$0.15/serving$9.00 · 30 Capsules

Ideal for: Immune support — quercetin plus fucoidan for enhanced immune modulation

Not ideal for: Those needing a full quercetin dose without underdosing risk

Pros

Most affordable at $0.15/serving
Immune-supporting fucoidan
Third-party tested
Science-focused brand

Cons

Only 150mg quercetin
Bio-enhanced claim less proven than phytosome
May need 2 capsules for full dose

Buy Nowon Amazon

Read full Quercetin + Optimized Fucoidanguide →

Sunergetic Premium Quercetin & Bromelain Supplement - Powerful Quercetin Bromelain Complex to Help Support Immune System & Seasonal Support - Quercetin 1000mg Per Serving - 60 Capsules

Sunergetic

806 Amazon reviews

8/10

(806)

VegetarianGluten-free

1,000mg quercetin matches clinical research doses for seasonal immune and respiratory support (Jafarinia et al. 2020 asthma trials used 1000mg). Bromelain inclusion enhances quercetin absorption and adds complementary proteolytic support. Strong 4.6-star rating signals satisfaction.

IngredientQuercetin 1000mg + Bromelain

Dose1,000mg quercetin per 2-capsule serving; 30 servings per bottle

FormCapsule

TestingGMP manufactured; third-party testing not publicly disclosed

1,000mg quercetin per 2-capsule serving; 30 servings per bottleClinical range: 500-1000mg daily

Therapeutic dose

$0.60/serving$17.95 · 60 Count

Ideal for: Users seeking a high-dose quercetin + bromelain combination for immune support and seasonal respiratory wellness

Not ideal for: Users wanting isolated quercetin or those on anticoagulant medications

Pros

1,000mg quercetin matches upper clinical research doses for immune and respiratory support
Bromelain improves quercetin absorption — synergistic pairing
Vegetarian and gluten-free formulation
806 reviews at 4.6 stars signals strong consumer satisfaction

Cons

Third-party testing not publicly disclosed — no published COAs on the brand site
Bromelain GDU activity not disclosed on bullets
Can enhance anticoagulant effects — requires physician oversight if on blood thinners

Buy Nowon Amazon

Read full Quercetin 1000mg + Bromelainguide →

Staff Pick

Jarrow Formulas Quercetin 500mg Capsules - 200 Veggie Caps - Supports Antioxidant Status, Cardiovascular Health & Immune Health - 200 Servings

Jarrow Formulas

4,088 Amazon reviews

7.9/10

(4,088)

VeganGluten-freeNon-GMO

A no-frills 500mg quercetin capsule at $0.18 per serving — the most cost-effective way to supplement quercetin if budget is the primary concern. Jarrow Formulas has a 40+ year track record in the supplement industry. Simple, single-ingredient formula.

IngredientQuercetin Dihydrate

Dose500mg quercetin

FormCapsule

TestingGMP Certified

500mg quercetinClinical range: 500-1000mg daily

Therapeutic dose

$0.25/serving$49.99 · 200 Servings

Ideal for: Budget — straightforward 500mg quercetin at the lowest price

Not ideal for: Anyone wanting meaningful absorption without pairing with bromelain separately

Pros

Very affordable at $0.18/serving
Full 500mg dose
Simple single-ingredient formula
Established 40+ year brand

Cons

No absorption enhancers
Standard form with poor bioavailability
Only GMP certified
May need to pair with bromelain separately

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Integrative Therapeutics Alpha-Glycosyl Isoquercitrin - Quercetin Supplement for Cell Health & Antioxidant Pathway Support* - Supports Cell Integrity* - Vegan & Dairy-Free - 60 Count (60 Servings)

Integrative Therapeutics

359 Amazon reviews

7.7/10

(359)

VeganGluten-FreeDairy-FreeSoy-FreeNo Artificial Colors

Alpha-glycosyl isoquercitrin represents a meaningful formulation advancement over standard quercetin — enzymatic modification to add a glucose molecule dramatically increases water solubility and intestinal absorption, meaning each milligram delivers more quercetin to systemic circulation. Integrative Therapeutics' use of this ingredient reflects the brand's clinical-grade philosophy of choosing the most bioavailable form over the cheapest common form.

IngredientAlpha-Glycosyl Isoquercitrin (bioavailable quercetin)

Dose1 capsule daily (60 capsules, 60 servings)

FormCapsule

TestingGMP Certified

1 capsule daily (60 capsules, 60 servings)Clinical range: 500-1000mg daily

Blend formula

$0.57/serving$34.50 · 60 Count

Ideal for: Adults seeking a highly bioavailable quercetin form for antioxidant pathway support and cellular integrity, particularly those who have had poor absorption with standard quercetin supplements

Not ideal for: Those seeking high-dose quercetin (500mg+) for immune support or anti-inflammatory protocols, as this form is optimized for bioavailability at lower doses rather than high-dose loading

Pros

Uses alpha-glycosyl isoquercitrin — an enzymatically modified quercetin with 17–20x greater bioavailability than standard quercetin aglycone
Vegan, gluten-free, dairy-free, and soy-free — one of the cleanest allergen profiles in the quercetin category
60 servings per bottle at $34.50 — two-month supply at a reasonable cost for a specialty bioavailability-enhanced ingredient
Clinical-brand formulation from Integrative Therapeutics, backed by 45+ years of practitioner-channel manufacturing

Cons

359 reviews is a smaller feedback base compared to mainstream quercetin products — less real-world data available
Specialty ingredient (alpha-glycosyl isoquercitrin) is less recognized by general consumers compared to quercetin dihydrate or quercetin + bromelain
Price of $34.50 per bottle is higher than commodity quercetin capsules, though the bioavailability advantage partially offsets cost-per-absorbed-unit

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Pairs Well With

Frequently taken together based on complementary benefits

NMN

Alive By Science NMN Powder

500mg per scoop

(223)$1.83/serving

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Vitamin C

Sports Research Vitamin C Gummies 500mg (Sugar Free, 60 Count)

Staff Pick

500mg vitamin C per gummy, 60 gummies

(10,158)$0.33/serving

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Browse all supplement comparisons →

How to Choose

Phytosome vs Standard: The Bioavailability Gap

Standard quercetin dihydrate has ~2% oral bioavailability — meaning 98% of what you swallow passes through unabsorbed. Quercetin phytosome (Quercefit by Indena) wraps quercetin in a phospholipid shell, achieving up to 20x higher plasma levels in pharmacokinetic studies. This means 250mg of phytosome delivers more active quercetin to your tissues than 1000mg of standard quercetin.

Bromelain and Vitamin C as Absorption Helpers

If phytosome is too expensive, pairing quercetin with bromelain (a pineapple enzyme) and/or vitamin C meaningfully improves absorption. Bromelain has its own anti-inflammatory properties and appears to enhance quercetin bioavailability. Vitamin C regenerates oxidized quercetin and provides synergistic antioxidant protection. Many products include these combinations at a lower price point than phytosome.

Take with Fat for Better Absorption

Quercetin is a lipophilic (fat-soluble) compound. Taking it with a meal containing healthy fats (olive oil, avocado, nuts) significantly improves absorption compared to taking it on an empty stomach. This applies to all quercetin forms, including phytosome, though the phytosome already contains built-in phospholipids.

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Thorne Quercetin Phytosome

9.4/10$0.77/servingBest for: Overall — best absorption via phytosome technology with NSF certification

The best quercetin supplement uses phytosome technology for up to 20x better absorption, delivering meaningful anti-inflammatory and immune benefits at a lower effective dose.

Evidence:RCT (2019) · n=12 · high confidence[#1]

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Evidence level, dosage, side effects, and more →

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Related Conditions

Longevity & Healthy Aging Immune Function Allergies Gout Respiratory Health

Frequently Asked Questions

What is the best quercetin supplement?

Thorne Quercetin Phytosome is our top pick because phytosome technology solves quercetin's biggest weakness — its extremely poor absorption. At 250mg per capsule, it delivers more bioavailable quercetin than 1000mg of standard form.

Evidence:RCT (2019) · n=12 · high confidence[#1]

Is quercetin safe to take daily?

Yes, quercetin is generally recognized as safe at doses up to 1000mg daily and has been used in human trials lasting up to 12 weeks without significant adverse effects. It is a naturally occurring flavonoid consumed daily in foods like onions, apples, and berries. Long-term supplementation data is limited but safety signals are reassuring.

Can quercetin help with COVID or viral infections?

Quercetin gained attention during COVID-19 for its in-vitro antiviral properties and immune-modulating effects. Some clinical trials showed reduced symptom severity when quercetin was used as an adjunct treatment, but the evidence is not strong enough to recommend it as a primary antiviral. It may support general immune resilience through mast cell stabilization and cytokine modulation.

Continue Reading

Supplement Guide

Fisetin

Bottom line: Fisetin is the most promising natural senolytic, clearing aging "zombie" cells. Human trials at Mayo Clinic are ongoing — 100-500mg daily is the typical supplement dose.

Condition Guide

Longevity & Healthy Aging

References

RCTRiva A, Ronchi M, Petrangolini G, Bosisio S, Allegrini P (2019). Improved oral absorption of quercetin from quercetin Phytosome. European Journal of Drug Metabolism and Pharmacokinetics. DOI PubMed
Meta-analysisSerban MC, Sahebkar A, Zanchetti A, et al. (2016). Effects of quercetin on blood pressure. Journal of the American Heart Association. DOI PubMed
ReviewLi Y, Yao J, Han C, et al. (2016). Quercetin, inflammation and immunity. Nutrients. DOI PubMed