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Natural Factors, Quercetin, Bioflavonoid Complex, 90 Capsules

By Natural Factors

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  • Product Code: NFS-01387
  • UPC Code: 068958013879
  • Package Quantity: 90 Capsules
  • Dimensions: 2.2 x 2.2 x 4.3 in, 0.2 lbs (0.09 kg)
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Product Overview

  • Dietary Supplement
  • Easy to Swallow Capsules
  • Support for the Body's Use of Vitamin C
  • Purity & Potency Guaranteed

Natural Factors Quercetin capsules are enhanced with Citrus Bioflavonoids, Bromelain and Rutin. 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.

Suggested Use

1 capsule, 1-3 times per day or as directed by a health professional.

Other Ingredients

Gelatin capsule (gelatin, purified water), rice flour, magnesium stearate (vegetable grade), silicon dioxide.

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.

Contains no artificial preservatives, color or sweeteners; no dairy, soy, starch, wheat or yeast.


Keep out of reach of children.

Sealed for your protection. Do not use if seal is broken. For freshness, store in a cool, dry place.

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Supplement Facts
Serving Size: 1 Capsule
  Amount Per Serving % Daily Value
Total Carbohydrate <1 g <1%**
Quercetin 235 mg
Citrus Bioflavonoid (from citrus peels) 235 mg
Bromelain 1000 GDU (from pineapple stems) 45 mg
Rutin 45 mg
** Percent Daily Values are based on 2,000 calorie diet.
† Daily Value not established.

iHerb Customer Reviews

5 Stars
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1 Stars

Amazing Herbal Helper

Posted by Reviewer1466427 on Jan 02, 2007

My husband had problems with his sinus' for many years. In the latter years with the post nasal drip he was also getting an increased discomfort of heart burn. With in use of 1/2 a bottle of this product the sinus issue is completely cleared up. No more post nasal drip, and it doesn't burn when he breaths anymore. My son who is 6 is also taking one a day. He has problems with pnuemonia and asthma when he gets a cold. This product has built up his immune system so the infections are fewer and farther in between. I have recommended this product to friends and their comment has been "I don't want to be with out it." I urge people to try this. It is worth it in every way!

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7 people found the following review helpful

Helps my asthma

Posted by Reviewer1530174 on Jan 17, 2010

I started taking this about a year ago, and my allergist was impressed with how my lung function had improved. He told me to "keep doing what you are doing." :-)

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3 people found the following review helpful

Helped with my BPA fillings

Posted by Kittyhearsawho on Jan 23, 2014

I bought this for my son's sinus issues, for which it works very well. I started using it recently after a trip to the dentist. I needed two fillings and avoided the amalgams because of the mercury and opted for composites instead. I started feeling unwell a few days later and my filled teeth felt like they were tingling for the next two weeks. I did some research as I wondered if I was slightly allergic to the fillings. What I found out was, that the white composite fillings contain BPA!!! I started researching what to do and found that quercetin pulls BPA out of the body. I took one, and with half an hour felt better than I had in weeks. I am taking four a day until I work out what to do, but finally i'm at least feeling normal again. If you need a filling, make sure you insist that the dentist use BPA free composites!!! I've learned the hard way.

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3 people found the following review helpful

Helps relieve sinus problems

Posted by Reviewer2781095 on Jan 19, 2008

A nutritionist recommended quercetin to me for chronic sinus infections. It, combined with NAC, does an amazing job when anti-biotics are not an option or they need a boost. Natural Factors works for me.

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2 people found the following review helpful

4 Leftys

Posted by Reviewer2101798 on Apr 16, 2008

My husband and children have been using this product for over a year now. It helped my husband's heart burn and cleared up very sensitive burning sinus'. My children have low to weak immune systems and has helped them not to get colds as often. I would highly recommend this product for use.

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2 people found the following review helpful

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