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The Best Source Naturals Activated Quercetin of 2023 – Reviewed and Top Rated

2,751 Reviews Scanned

Rank No. #1

Source Naturals Activated Quercetin, Bioflavanoid Complex, for Seasonal & Immune Support* - 200 Capsules

Seasonal support supplement featuring quercetin, a natural histamine blocker, helping to inhibit histamine release.*
Key additional ingredients—like the pineapple enzyme bromelain, magnesium citrate, and vitamin C—serve to activate and optimize quercetin’s benefits, in addition to providing immune, respiratory, and antioxidant support.*
Suggested Use: 3 capsules 1 to 2 times daily in divided doses, between meals. If you have a delicate, easily irritated stomach, take with meals.
Over 40 Years of Trust. Source Naturals was created in 1982 by CEO Ira Goldberg to support everyone’s potential to enjoy optimal health.
Manufactured in the USA. Manufactured in Scotts Valley, CA, under the Good Manufacturing Practices (cGMPs) established by the US Food and Drug Administration (FDA).

Rank No. #2

Source Naturals Activated Quercetin - Plant-Derived Bioflavonoid Complex - Seasonal & Immune Defense - 100 Vegetarian FriendlyTablets

Seasonal support supplement featuring quercetin, a natural histamine blocker, helping to inhibit histamine release, along with key additional ingredients for immune support. This product contains, bromelain, which has been shown in preliminary studies to support a healthy inflammatory response. It also contains activated Quercetin also contains vitamin C, which supports immune health.
Well Made Supplement: Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no preservatives, or artificial color, flavor or fragrance.
Suggested Use:. 3 capsules 1 to 2 times daily in divided doses, between meals. If you have a delicate, easily irritated stomach, take with meals. Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no sugar, salt, preservatives, or artificial color, flavor or fragrance.
Over 40 Years of Trust. Source Naturals was created in 1982 by CEO Ira Goldberg to support everyone’s potential to enjoy optimal health.
Manufactured in the USA. Manufactured in Scotts Valley, CA, under the Good Manufacturing Practices (cGMPs) established by the US Food and Drug Administration. (FDA)

Rank No. #3

Source Naturals Activated Quercetin, Bioflavonoid Complex, Seasonal & Immune Support* - 50 Tablets

Seasonal support supplement featuring quercetin, a natural histamine blocker, helping to inhibit histamine release, along with key additional ingredients for immune support. This product contains, bromelain, which has been shown in preliminary studies to support a healthy inflammatory response. It also contains activated Quercetin also contains vitamin C, which supports immune health.
Key additional ingredients— like the pineapple enzyme bromelain, magnesium citrate, and vitamin C.
Suggested Use: 3 tablets 1 to 2 times daily in divided doses, between meals. If you have a delicate, easily irritated stomach, take with meals.
Over 40 Years of Trust. Source Naturals was created in 1982 by CEO Ira Goldberg to support everyone’s potential to enjoy optimal health.
Manufactured in the USA. Manufactured in Scotts Valley, CA, under the Good Manufacturing Practices (cGMPs) established by the US Food and Drug Administration. (FDA)

Rank No. #4

Source Naturals Activated Quercetin - Plant-Derived Bioflavonoid Complex - Seasonal & Immune Defense - 100 Tablets

SEASONAL SUPPORT - Seasonal support supplement featuring quercetin, a natural histamine blocker, helping to inhibit histamine release, along with key additional ingredients for immune support.
NATURAL INGREDIENTS - Activated Quercetin is a formula containing plant derived quercetin, with the added seasonal and immune benefits of bromelain and vitamin C.
PLANT-SOURCED - Activated Quercetin’s main ingredient, quercetin, is a unique bioflavonoid derived from plant sources which has been shown in human cell culture studies to inhibit histamine release.
THE POWER OF BROMELAIN - This product contains, bromelain, which has been shown in preliminary studies to support a healthy inflammatory response.
ADDED VITAMIN C - Activated Quercetin also contains vitamin C, which supports immune health.

Rank No. #5

Natural Factors Bioactive Quercetin EMIQ 50 mg with Vitamin C, Supports Sinus, Heart and Immune Health, 60 Capsules

Helps support healthy immune function – specifically of the sinuses and the upper respiratory system*
Provides antioxidant support
Supports cardiovascular and heart health*
One capsule: Taken twice daily. Vegan, non-GMO, free of gluten and soy
Comfort and mobility: The active compound in celery seed support joint flexibility, comfort and mobility for healthy joint function*

Last update on 2025-09-13 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

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FAQ:

Q: Where does quercetin come from?

A: Quercetin is a plant flavonol from the flavonoid group of polyphenols . It is found in many fruits, vegetables, leaves, and grains; red onions and kale are common foods containing appreciable content of quercetin.

Q: What is quercetin derived from?

A: Quercetin is a flavonoid widely distributed in nature. The name has been used since 1857, and is derived from quercetum (oak forest), after Quercus. It is a naturally occurring polar auxin transport inhibitor.

Q: Is quercetin an antihistamine?

A: Quercetin is considered as a natural antihistaminic. But quercetin has a larger spectrum of action than classical antihistaminics [2][3][4]: It prevents the recruitment of mast cells (inhibition of chemokines (IL-8, ICAM-1) and cytokines ), It stabilizes the mast cells and blocks its degranulation.

Q: What is quercetin made from?

A: Quercetin is produced in plant from phenylalanine and malonyl-CoA through numerous enzymatic processes. In plants, it is mainly present in the conjugated forms with sugars forming aglycone-glycone (sugar) complexes. It is modified in plants by the processes like glycosylation, methylation, acetylation…

Source Naturals Activated Quercetin