Buy Quercetin Complex Supplement with Bromelain and Vitamin C
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Quercetin Complex Supplement

Quercetin, stinging nettles, the digestive enzyme bromelain, N-Acetyl-L-Cysteine, and vitamin C physician formulated to support inhibited histamine response, respiratory, and healthy immune function.†

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Quercetin Complex Supplement Facts

Serving Size: 2  capsules
Servings Per Container: 60
Ingredients Daily
% Daily
Vitamin C (as Ascorbic Acid USP) 300 mg 333%
Quercetin Dihydrate 400 mg *
Stinging Nettle (Leaves) 400 mg *
Bromelain (from Pineapple) 100 mg (240 GDU) *
N-Acetyl-L-Cysteine USP 50 mg *

*Daily Value not established.
Other ingredients: Hypromellose(Natural Vegetable Capsules), Magnesium Stearate, Silicon Dioxide and Stearic Acid.

Cooper Complete Gluten Free icon

This product is formulated to be free of allergens derived from: Gluten, yeast, artificial colors and flavors.

While we strive to ensure the label information on this site represents the label on the product available for purchase, products are updated from time to time. Please consult the label on the product you purchase for the most accurate ingredient and allergen information.


Item Number: 294
SKU: 816899000294

What It Is

Quercetin Dihydrate, the digestive enzyme bromelain, stinging nettles, N-Acetyl-Cysteine, and vitamin C physician formulated to support inhibited histamine response for allergy suffers, respiratory, and healthy immune function.†

How to Use:

As a dietary supplement, take one (1) vegetarian capsule twice daily or as directed by your health care professional. Each bottle contains 120 vegetarian capsules.

How It Helps

Cooper Complete Quercetin Complex is a custom formulation containing Vitamin C, Quercetin, stinging nettles, bromelain, and N-acetyl-cysteine USP.

Quercetin is a natural flavonoid commonly found in fruits, vegetables and herbs. Apples, capers, onions, tea, grapes, blueberries, blackberries and dark cherries all contain quercetin.  It has been shown to have many beneficial effects and biological activities, including anti-inflammation, antioxidant and neuroprotective.†

Each bottle of Quercetin Complex contains 120 vegetarian capsules. The daily recommended serving is one capsule twice daily or as recommended by your physician or health care professional.

This product is formulated to be free of allergens derived from: Gluten, yeast, artificial colors and flavors.

Cooper Complete products are verified and lot tested. If you would like a copy of a Certificate of Authenticity for a specific product or would like to learn more about our testing process and results, please contact us at or call our team directly at 888.393.2221 9 a.m. until 5 p.m. Monday-Friday central time (CST).

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Customer Q&As

If you have questions, we have answers. See what real people are asking about Cooper Complete products.

10 Questions
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Does quercetin help with allergies?


Yes, quercetin stabilizes mast cells, which diminishes the release of histamine, the compound known to cause a reaction to seasonal allergies. The Vitamin C in the Quercetin Complex also reduces histamine.


Could quercetin help prostatitis?


A small double-blind study of men with inflammatory or non-inflammatory chronic prostatitis found that 67% of the men who took quercetin (500 mg twice daily, for a total of 1,000 mg per day), had a significant overall improvement in their symptoms compared to the men in the placebo group.


Is it true that quercetin can impair iron absorption?


Quercetin is a polyphenol found in abundant quantities in apples, citrus, onions, green leafy vegetables, coffee, and tea. Studies show coffee and tea can inhibit iron absorption, particularly the non-heme form of iron found in plants and grains. Plant forms of iron are as easily absorbed by the body as animal forms of iron. The recommendation for coffee and tea drinkers taking supplemental iron is to avoid these beverages for an hour before and after taking iron supplements. For this reason, we suggest Iron supplements (including multivitamins with iron) and Quercetin Complex be taken separately.


Do Cooper Clinic Physicians recommend Quercetin Complex?


Yes. Emily Hebert, MD, Cooper Clinic Platinum Physician suggests daily supplementation of quercetin supplements to support a healthy immune system.


Why was Quercetin Complex Supplement added to the Cooper Complete line of dietary supplements?


Quercetin Complex Supplement was added to the physician-formulated line of Cooper Complete Nutritional Supplements to support immune health function. The suite of Cooper Complete Immune Health Supplements also includes multivitaminsomega-3 fatty acids, vitamin Cvitamin D3Turmeric Curcumin Complex, and the mineral zinc.


Does Quercetin Complex affect vision?


Studies suggest Quercetin may support healthy vision by mediating sorbitol production†.


Where does the Quercetin in Quercetin Complex come from?


The Quercetin in Cooper Complete Quercetin Complex is derived from seeds and pods of the dimorphandra mollis deciduous tree.


Can this product be taken in conjunction with the prescription digoxin?


No. You should not take Quercetin Complex if you take the prescription medication digoxin.


Could Quercetin Complex Supplement help my blood pressure?


Research regarding the impact of quercetin has not been conclusive. A review and meta-analysis of seven trials found that taking 500 mg to 1,000 mg of quercetin daily reduced systolic blood pressure by approximately 3.04 mm Hg and diastolic blood pressure by 2.63 mm Hg, in people with and without high blood pressure.


I’ve heard quercetin can be poorly absorbed. How well is Cooper Complete Quercetin Complex absorbed?


Quercefit® Quercetin Phytosome is used in this formula, as it increased peak plasma quercetin levels by 20-fold compared to standard quercetin.

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