Quercetin 500 mg®
Non-Nutrient / Non-BotanicalBrand: Natural Factors
Functions
Net Contents
60 Vegetarian Capsule(s)
Serving Size
1 Capsule(s)
Servings Per Container
Not specified
Supplement Form
Capsule
Bar Code (UPC/SKU)
0 68958 01390 9
Product Version
R0
Label Analysis
Objective insights generated automatically from the official DSLD label — a quick, factual read of how this product is formulated and disclosed.
Single-ingredient formula listed in Supplement Facts.
Every active ingredient discloses a specific amount per serving.
Label states: Vegan, Vegetarian, Non-GMO, Gluten-Free.
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
- Egg
- Fish
- Shellfish
- Tree Nuts
- Wheat
- Soy
- Gluten
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 per day
| Ingredient | Amount Per Serving | |
|---|---|---|
| Quercetin | 500 mg | — |
Not Present
Other Ingredients
Target Groups
Label Claims
Directions & Suggested Use
Suggested/Recommended/Usage/Directions
Suggested Usage: 1 capsule per day or as directed by a health professional.
Warnings & Precautions
Precautions re: Pregnant or Nursing or Prescription Medications
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.
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
Quercetin is one of the most well-known antioxidant bioflavonoids. A free radical scavenger, quercetin helps support healthy sinus, respiratory and immune system function.
Formulation re: Other
Manufactured by Natural Factors to ensure safety and potency in accordance with Good Manufacturing Practices (GMP) of the FDA and Health Canada.
Formulation re: Does NOT Contain
Contains no artificial colors, preservatives, or sweeteners; no dairy, starch, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, animal products, salt, tree nuts, or GMOs.
Formulation re: Vegetarian/Vegan
Suitable for vegetarians/vegans
Formulation re: Other
Immune Support
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
Seals/Symbols
Isura Non-GMO - Mass Spec Documentation - Lab Tested
General Statements: All Other Content
Product of Canada Recyclable container and label.
Brand IP Statement(s) re: (c), (TM), (SM)
Isura is a trademark of ISURA.
Manufacturer & Distributor
Manufacturer
Natural Factors Canada
Distributor
Natural Factors
14224 167th Avenue SE, Monroe, WA, 98272
Market Reference
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NOW Quercetin 500 mg
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Where to Buy Locally
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The Vitamin Shoppe
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5300 Stockdale Hwy, Bakersfield, CA 93309
Prime Sports Nutrition
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4800 White Ln Ste G, Bakersfield, CA 93309
Rev Nutrition
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4701 White Ln, Bakersfield, CA 93313
Max Muscle Nutrition
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2660 Oswell St Ste 103, Bakersfield, CA 93306
eupepwell
5.0 (4)Vitamin & supplements store
5630 District Blvd #120, Bakersfield, CA 93313
NutraZone Nutrition
5.0 (99)Vitamin & supplements store
3401 Coffee Rd c, Bakersfield, CA 93308
Iron Arms Bodybuilding Supplements
5.0 (65)Vitamin & supplements store
6801 White Ln STE D, Bakersfield, CA 93309
Nanette's Nature's Sunshine Products
5.0 (13)Vitamin & supplements store
408 Chester Ave, Bakersfield, CA 93301
Research & Studies
Effects of the dietary flavonoid quercetin upon performance and health
JM Davis, EA Murphy… - Current sports medicine …, 2009 - journals.lww.com
… the effects of 7 d of quercetin (500 mg twice daily, a dose similar to the 12.5 mg·kg −1 dose … time to fatigue on a bicycle ergometer in healthy untrained men and women. An increase in …
2009311 citationsHealth benefits of quercetin
R Kumar, S Vijayalakshmi… - Defence Life Science …, 2017 - publicationsdrdo.in
… Quercetin was generally available, in the form of capsules or tablets … 50 mg to 500 mg, as dietary supplements. The dosage of quercetin has been recommended based on the health …
2017125 citationsThe effect of quercetin supplementation on selected markers of inflammation and oxidative stress
G Askari, R Ghiasvand, A Feizi… - … research in medical …, 2012 - pmc.ncbi.nlm.nih.gov
… 8 weeks in four groups, each containing 15 individuals: 500 mg quercetin + 250 mg vitamin C as pro-oxidant (Q+C), 500 mg of quercetin alone (Q), 250 mg of vitamin C alone (C), and …
2012177 citationsInfluence of quercetin supplementation on disease risk factors in community-dwelling adults
AM Knab, RA Shanely, DA Henson, F Jin… - Journal of the American …, 2011 - Elsevier
… The objective of this study was to investigate the effect of quercetin, vitamin C, and niacin supplements (500 mg quercetin, 125 mg vitamin C, and 5 mg niacin [Q-500]; 1,000 …
201163 citationsThe effects of quercetin supplementation on body composition, exercise performance and muscle damage indices in athletes
G Askari, R Ghiasvand, Z Paknahad… - International journal …, 2013 - pmc.ncbi.nlm.nih.gov
… a 500 mg supplemental quercetin capsule plus a 250 mg vitamin C pill, a 500 mg supplemental quercetin capsule plus a 250 mg … at Isfahan University of Medical Sciences having an …
201366 citationsDose–response to 3 months of quercetin-containing supplements on metabolite and quercetin conjugate profile in adults
L Cialdella-Kam, DC Nieman, W Sha… - British journal of …, 2013 - cambridge.org
… , and thus improve our understanding of the health benefits of flavonoids and their underlying … apparent with the 1000 mg/d dose at 1 month, while the effects of the 500 mg/d dose were …
201374 citations
Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2021-04-22. DSLD Label ID: 247523. 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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