Quercetin Bioflavonoid Complex®
Other CombinationsBrand: Natural Factors
Net Contents
90 Capsule(s)
Serving Size
1 Capsule(s)
Servings Per Container
Not specified
Supplement Form
Capsule
Bar Code (UPC/SKU)
0 68958 01387 9
Product Version
R4
Label Analysis
Objective insights generated automatically from the official DSLD label — a quick, factual read of how this product is formulated and disclosed.
5 distinct active ingredients are disclosed in Supplement Facts.
Every active ingredient discloses a specific amount per serving.
1 ingredients report an established %DV per serving.
This analysis is generated algorithmically from label data for educational reference only. It is not a product endorsement, ranking, or medical advice.
Allergen Guide
Contains
- Wheat
- Soy
Free From
- Milk
Allergen flags are parsed automatically from the official label's claims and statements. Always verify against the physical product label before use, especially if you have a severe allergy.
Supplement Facts
Serving Size: 1 Capsule(s) · 1–3 per day
| Ingredient | Amount Per Serving | % Daily Value |
|---|---|---|
| Total Carbohydrates | < 1 g | 1% |
| Quercetin | 235 mg | — |
| Citrus Bioflavonoids(citrus peels) | 235 mg | — |
| Bromelain(Pineapple) | 45 mg | — |
| Rutin | 45 mg | — |
Not Present
Other Ingredients
Target Groups
Label Claims
Directions & Suggested Use
Suggested/Recommended/Usage/Directions
Suggested Usage: 1 capsule, 1-3 times per day or as directed by a health professional.
Warnings & Precautions
Precautions re: Children
Keep out of reach of children.
Precautions re: All Other
Sealed for your protection. Do not use if seal is broken.
Storage
Storage
For freshness store in a cool, dry place.
Formulation
Formula re: Contains
Natural Factors Quercetin capsules are enhanced with Citrus Bioflavonoids, Bromelain and Rutin.
Formulation re: Does NOT Contain
Contains no artificial preservatives, color or sweeteners; no dairy, soy, starch, wheat or yeast.
FDA Statements
FDA Disclaimer Statement
This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
FDA Statement of Identity
DIETARY SUPPLEMENT
Other Label Statements
General Statements: All Other Content
Quercetin, a popular bioflavonoid, is essential to optimize the body's use of Vitamin C. Bioflavonoids are brightly-colored substances that are found in fruits 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. All Natural Factors products are manufactured in accordance with the Government of Canada's Good Manufacturing Practices (GMP), among the highest standards in the world.
General Statements: All Other Content
PRODUCT OF CANADA
Seals/Symbols
(recycle) Recyclable container.
Seals/Symbols
Purity & Potency Guaranteed
General Statements: All Other Content
SUPPORT FOR THE BODY'S USE OF VITAMIN C
General: Product/Version Code
R4
General Statements: All Other Content
EASY TO SWALLOW CAPSULES(capsule)
Manufacturer & Distributor
Manufacturer
Natural Factors Canada
Distributor
Natural Factors
1111 - 80th St. SW, Ste 100, Everett, WA, 98203, USA
Market Reference
Natural Factors Quercetin with Zinc and Copper
Walmart - Pattern4.8(2100)$23.07
Natural Factors Quercetin 500 mg
The Healthy Place4.8(2100)$19.57
Natural Factors C Extra + Quercetin
Walmart - Pattern4.8(382)$13.97
Natural Factors Quercetin LipoMicel Matrix
Village Vitamin Store4.8(2300)$30.23
Natural Factors Citrus Bioflavonoids
Walmart - Pattern4.8(1100)$11.87
Natural Factors Bioactive Quercetin EMIQ
vitamin360.com4.7(701)$20.28
Natural Factors Time Release 1000mg Tablets
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Bioflavonoid Complex
SFI Health4.8(4)$30.99
Where to Buy Locally
Enter your city or ZIP code to find supplement & health stores in your area that may carry this product.
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Discount Nutrition Superstore
5.0 (827)Vitamin & supplements store
288 E Greenway Pkwy Ste 104, Phoenix, AZ 85022
Key Nutrients
5.0 (20)Vitamin & supplements store
9375 E Shea Blvd Suite 100, Scottsdale, AZ 85260
Peak Nutrition
5.0 (470)Vitamin & supplements store
6501 E Greenway Pkwy Unit 150, Scottsdale, AZ 85254
GNC
3.9 (52)Vitamin & supplements store
2811 W Agua Fria Fwy #1B, Phoenix, AZ 85027
The Vitamin Shoppe
4.5 (142)Vitamin & supplements store
7708 W Bell Rd Ste 150, Glendale, AZ 85308
BizarreMart Nutritional Cleanse
5.0 (10)Vitamin & supplements store
13435 N 36th St, Phoenix, AZ 85032
Rexius Nutrition Tempe
5.0 (123)Vitamin & supplements store
101 E Southern Ave, Tempe, AZ 85282
Discount Nutrition Superstore
4.9 (1073)Vitamin & supplements store
1912 E Camelback Rd, Phoenix, AZ 85016
Research & Studies
Which sources of flavonoids: complex diets or dietary supplements?
S Egert, G Rimbach - Advances in Nutrition, 2011 - academic.oup.com
… whether vascular health-promoting and … quercetin has been marketed as a dietary supplement with recommended daily doses of up to 1 g and more (31), whereas the daily quercetin …
2011278 citationsA systematic review: quercetin—secondary metabolite of the flavonol class, with multiple health benefits and low bioavailability
OD Frenț, L Stefan, CM Morgovan, N Duteanu… - International Journal of …, 2024 - mdpi.com
… , we pay special attention to quercetin, detailing its chemical … present natural sources of quercetin and emphasize its health … Moreover, quercetin can inhibit bacterial virulence factors, …
2024134 citationsThe pharmacological activity, biochemical properties, and pharmacokinetics of the major natural polyphenolic flavonoid: quercetin
GES Batiha, AM Beshbishy, M Ikram, ZS Mulla… - Foods, 2020 - mdpi.com
… Quercetin is one of the most significant bioflavonoid … C-protein (CRP) expression that causes inflammation [57]. Due to its … of quercetin in the urine and plasma of healthy people after the …
2020871 citations… High-Dose Vitamin C Supplement Enriched with a Low Dose of Bioflavonoids; In Vitro Assessment and In Vivo Evaluation Through a Clinical Study in Healthy …
V Chrysikopoulou, A Rampaouni, E Koutsia… - Nutrients, 2025 - mdpi.com
… vitamin C and quercetin resulted inducing Nuclear Factor Erythroid 2-Related Factor 2 (Nrf2) … Moreover, quercetin treatment has exhibited enhancement of anticancer effects of vitamin C …
202512 citationsConsideration for flavonoid-containing dietary supplements to tackle deficiency and optimize health
J Solnier, C Chang, J Pizzorno - International journal of molecular …, 2023 - mdpi.com
… diet with a high intake of citrus bioflavonoids [49]. … Clinical studies have proposed quercetin as a promising natural … is a complex process that is affected by numerous dietary factors. This …
202349 citationsDietary flavonoid quercetin and associated health benefits—an overview
AT Jan, MR Kamli, I Murtaza, JB Singh… - Food Reviews …, 2010 - Taylor & Francis
… Quercetin causes scavenging of free radicals like superoxide as such there occurs less chances of reaction between free radicals and nitric oxide. Strong anti-oxidative mechanism …
2010204 citations
Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2012-04-26. DSLD Label ID: 8221. This information is provided for educational reference only and is not medical advice. Always follow the product label and consult a doctor or pharmacist before use.
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