🟢 100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 50% of ingredients have research evidence
A Label Compliance Grade

Product Label

📸

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Label Data

1 Capsule(s) Serving Size
Other Combinations Product Type
50% Evidence Coverage

Supplement Facts — Evidence Check

📊 Market median: 500.0mg (283 products) 📚 173 studies (Tier A: 0, B: 62)
This product: 235mg
📊 Market median: 500.0mg (283 products) 📚 173 studies (Tier A: 0, B: 62)
This product: 235mg
45 mg
📊 Market median: 200.0mg (136 products) 📚 3 studies — no high-quality reviews
This product: 45mg
📊 Market median: 500.0mg (19 products)
This product: 45mg

Other Ingredients

Gelatin Capsule Rice powder Magnesium Stearate Silica

Label Claims — Verification

All Other
Structure/Function
All Other (99% of products) Structure/Function (84% of products) Nutrient (23% of products) Qualified Health (1% of products)

Target Groups

Adult (18 - 50 Years) Gluten Free Dairy Free Sugar Free

Product Information

📋 Directions for Use

Suggested Usage: 1 capsule 1-3 times per day or as directed by a health professional.

⚠️ Warnings & Precautions

Cautions: As with any supplement, consult your health professional before use if you are pregnant, breastfeeding, or trying to conceive, or if you are taking medication, have a medical condition, or anticipate a surgery.

Keep out of the reach of children.

Sealed for your protection. Do not use if seal is broken.

🧪 Formulation Notes

Non-GMO

Contains no artificial colors, preservatives or sweeteners; no dairy, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, salt, tree nuts, or GMOs.

Quercetin capsules are enhanced with citrus bioflavonoids, bromelain and rutin.

Additional Information

Mass spec Documentation Lab tested

Manufactured by Natural Factors to ensure safety and potency in accordance with Good Manufacturing Practices (GMP) of the FDA and Health Canada.

For freshness, store in a cool, dry place.

Product of Canada Recyclable container and label.

Purity & potency guaranteed

Bioflavonoid complex

Healthy immune support

R5

Quercetin, a popular bioflavonoid, is essential to optimize the body's use of vitamin C. Bioflavonoids are brightly-colored substances that are found in fruit and vegetables, typically as companions to vitamin C. Bioflavonoids are essential for proper absorption of vitamin C and have been shown to have antioxidant properties, increase capillary strength and keep collagen healthy.

Product Details

UPC / SKU 0 68958 01387 9
DSLD Entry Date 2017-07-25
Product Type Other Combinations
Form Capsule
DSLD ID 75019
Data Updated 2026-04-11

Research Evidence

184 Research Sources
55 Avg Quality Score
91 Systematic Review
75 Meta Analysis
7 Rct
7 Clinical Trial
2 Cochrane Review
1 Openfda Safety
B Treatment of gouty arthritis with traditional Chinese medicine decoction: Meta-analysis, network pharmacology analysis, and molecular docking
Meta Analysis Medicine 2024
B Effects of quercetin supplementation on lipid profile: A systematic review and meta-analysis of randomized controlled trials
Meta Analysis Critical reviews in food science and nutrition 2017
B Dietary polyphenols and the risk of metabolic syndrome: a systematic review and meta-analysis
Meta Analysis BMC endocrine disorders 2024
B Quercetin and endurance exercise capacity: a systematic review and meta-analysis
Meta Analysis Medicine and science in sports and exercise 2011
B Dietary flavonoid intake and smoking-related cancer risk: a meta-analysis
Meta Analysis PloS one 2013
B Clinical efficacy evaluation and potential mechanism prediction on Guizhi-Shaoyao-Zhimu decoction in the treatment of gouty arthritis based on meta-analysis, network pharmacology analysis, and molecular docking
Meta Analysis Medicine 2023
B A Systematic Review: Quercetin-Secondary Metabolite of the Flavonol Class, with Multiple Health Benefits and Low Bioavailability
Systematic Review International journal of molecular sciences 2024
B Dietary flavonoid for preventing colorectal neoplasms.
Cochrane Review The Cochrane database of systematic reviews
B Flavonoids for treating venous leg ulcers.
Cochrane Review The Cochrane database of systematic reviews
B The effects of quercetin supplementation on lipid profiles and inflammatory markers among patients with metabolic syndrome and related disorders: A systematic review and meta-analysis of randomized controlled trials
Meta Analysis Critical reviews in food science and nutrition 2020
View all evidence for Quercetin →

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